9krpmrx8

iTrader: (46)

Cool story bro.

superdan50

sounds like a giant waste of money

reni04

Please qualify your statement:Sounds like a giant waste of money"?. Can't see how any one would say don't change your oil frequently?.I have 93,000 miles runs like knew, what else is there?.

It's a judgeement call for me to make ah being it's my car?dudh?.Thats your opinion i guess.JUst remember its the owners choice how frequent you do things with a car.In my opinion buying headers and other speed equipment is a giant waste of money for the rx8, but then i generally am not a buttinskey.How often do you change your oil?.
I have the money to waste but then i don't consider it a waste just you do. I bet your one of those folks who run your oil 6,000miles because some one tells you you can right?.

Advice : Dont say silly things that have no merrit it mnakes you sound like your dancing for attention here in front of your friends..In short your comment is a waste of print thats my opinion.
Keeping your oil fresh is not a waste of money son.

J8635621

iTrader: (10)

When did you get your car?

superdan50

It has more to do with the fact that it has been proven that (even conventional) oil doesn't break down until 5000+ miles, and if you are running synthetic (unsure if you were referring to the 2 cycle premix or the "regular" oil) doesn't degrade to well beyond that. It's the same idea as using a half tank of gas only to drain the second half and refuel.

9krpmrx8

iTrader: (46)

Do an oil analysis test at a 5000 miles and then tell me it doesn't degrade.

superdan50

additionally, if the RX8 uses give or take 1qt every 1000 mile, and assume its topped of every 500 miles. the majority of the oil is well under the 5k mark. i may give it a second look if you can find a definitive/legitimate source.

9krpmrx8

iTrader: (46)

Do you know how much oil the entire system holds? And your source is here, search for "used oil analysis". Also the BITOG forums are great for oil discussions.

reni04

How often do you change your oil?.

reni04

I have used synthetic oil since i bought the car.I don't runmy oil for 5,000 miles because i at present do not use the addapter.I stated in earlier post i use tcw3 to add to my fuel for pre mix.I listened to a friend of mine who works for Mazda and he works primarly on the rx8.

I have 93,000 miles on my 8 and it is bone stock except for my intake.If you are doing some thing a certain way like changing your oil at 3,000 instead of 5,000 miles and its worked for 93,000 miles and your car is running like new, then?? well it works.

I premix using tcw3 at the ratio of approx 200 to 1 or about a half ounce per gallon since i bought the car years ago.To the point what is your point?.Try giving use full suggestions not allegations i am wasting my money and the like these comments have no point.Like i said before if i am changing my oil every 2500 or 3,000 miles well thats my personell business and if i use tcw3 and my car is as you know not the best design, i mean the 2004 series one 4 port and double trouble for some its a automatic 4 speed to boot.

Just try helping folks here insstead of making silly comments that are not relevent to the rx8 and its function.I am no body mechanic but i have owned the car for years and i followed all of my friends suggestions with it and Wala 93,000 miles later i am running like new and very happy with its design limitations and its current function.

How often do you change your oil?.

J8635621

iTrader: (10)

About once a year

Loki

iTrader: (1)

Wasn't this thread about Sohn adapters at one time? I could've sworn..

9krpmrx8

iTrader: (46)

I love how people get fairly high mileage on an Rx-8 and assume they found a secret recipe or something. Those are usually the ones bragging about high mileage and then the second their engine fails you never hear from them again.

There are a few common failure modes for the Renesis. For the most part oil choice and premix choice have zero to do with engine failure and in the rare case that oil choice is thought to be linked to engine failure we normally find that it is more a combination of owner neglect, ex: long oil change intervals, using cheap 5W20, and not adding oil between changes. If your engine lasted to 93,000 miles great, it's no big feat, you are just one of the 80% or so who never have engine failures and that is likely due to many reasons, not just your oil choice. You care for you car properly, that is great and commendable but by no means a guarantee that your engine will last over 150,000 (what I would consider to be normal now days). And I would watch it that T3CW long term if you still have a cat, it is not good for cat converters.

reni04

Fairly high milage?, really?, when so many failed at 25,000 or 30,000 comon guy admit it , i am treating my 8 correctly my 93,000 didn't come about as an accident you are trying to say my 93,000 is an accident how silly.Now that you have said that you will hear from me every month or so.Your argument with me is in your head ed.

Loki is correct this is about the sohn adapter not 9krpmrx8's spouting of none sense.I found no secret in my milage , just some common sense which i see isn't so common.Your too high on your self sir.Oh i did make a mistake however i took granddaughter to school today and my milage is 95,928.10.

Loki

iTrader: (1)

There are also people here who have reached a similar mileage on Mazda-recommended 5W20. I don't think he's saying your mileage is an accident, I think he's saying that everyone who made it that far, did so with their own formula. We don't have nearly enough people here to be able to conclude what's actually better.

But yes, changing oil more often is obviously better than not

logalinipoo

Yeap 2005 6 speed, i abused the car and got 133k from the first engine. It died from overheating multiple times then cooked a water seal.

I did oil changes by the manual. I think 5k. Mazda did every oil change until out of warrenty. Then i started using 5w20 at home.

I drive the crap out of it. Then added a quart of oil when the light came on. Never used a funnel i just dumped it in. Never checked the level. Never flushed the coolant. Never ever premixed. That was on stock coils with plugs/wires changed as per the manual. And almost 60k miles without the front main splash shield.

The cat failed just before inspection. I replaced it and a year later the engine started overheating all the way to redline on temp. After that happened 2times the radiator started boiling over with the car running as little as 30 sec from dead cold.

I personally think that oil is the key to a long life rotary, But mine seamed to get plenty with how i drive it. I hit the buzzer probably 10 times a day or more. In reality thats about 8700 rpm

9krpmrx8

iTrader: (46)

, do you have any clue how many RX-8's have made it to that mileage without doing anything special? Most of them actually so it's not an accident, just the norm. Sure some (my first engine died at 22,000 miles, second lasted me to 96,000 miles) die prematurely but that happens to a degree in every car made. Sure the Rx-8 has ahigh failure rate, no one is debtaing that and you rarely see anyone over 120k on an orginal engine and that is kind of sad in this day and age but it is what it is.

Either way, as I said, oil choice and premix choice is not going to guarantee you high mileage, plenty of meticulously maintained engines haved died prematurely. The only thing using good oil, changing it regularly, and using good premix and a SOHN will do is increase the chance that your engine is easier to rebuild when it does fail.

Here is an example. Just a personal example and by no means relatable to RX-8's as a whole.

My Mazda reman (died of a failed coolant seal at 30k) which only saw synthetic (Mobil1 0W-40), was premixed, and ran the SOHN. Notice the clean areas from the oil injectors injecting JASO FD synthetic 2 stroke and notice the condition of the bearings in the second picture.





Now for my buddies. His Mazda reman died with almost the same exact mileage from a slow loss of compression, we both live in the same area, similar driving styles, etc. He ran Castrol GTX 5W-20, Idemitsu premix, and the SOHN but only for the last few thousand miles.




So, neither of the failure modes had anything to do with oil choice or premix but my parts were reusable, some of his (housings) were not. And as you can see, this was with only 30,000 miles on two cars revved out daily. Remember, most carb build up is due to gas, not anything else. I only use Shell so who knows if that had a hand is reducing the carbon build up on mine.

RIWWP

iTrader: (2)

Reni04,

9k is right. Oil choice and weight have virtually* nothing to do with engine failure. There are far too many other areas of failure that our engines will see first before eventual bearing failure will take out an engine. The evidence of this is simply that I haven't heard of a single Renesis getting enough mileage on it that a bearing failure is what took out the engine.

No, they don't fail due to oil choice. Period.

They fail due to seal wear, seal damage, seal EGT flexing, cooling system failure, improper octane fuel, fuel pump failure, sudden water ingestion, OMP failure, OMP line clogging, cat failure, fuel line failure, etc...

And that is before you get to the more deliberate failure methods of improper tuning, bad parts choices, etc...

Oil type and weight simply do not matter when it comes to high mileage durability. 4-stroke oil is designed for high pressure high sheer environments, NOT for a bit of oil sprayed in a vacuum on a 400F-2,500F moving surface that will be burnt in no more than about 16ms after injection. There isn't a single 4-stroke oil attribute designed for that environment, so arguing about synthetic or non-synthetic or the choice of oil weight doesn't matter in the slightest for engine lifespan.

Yes, picking the SOHN adapter to get a more appropriate oil injected that will keep the OMP tubes cleaner and stop consuming crankcase oil... it's a good idea. Once you do that, then you will see that the argument about oil attributes is even more pointless, since there is only ONE environment left for the 4-stroke to work in: The e-shaft bearing seals. And for that, a high quality sythnetic oil designed to work in the high pressure high sheer environment of bearings will perform it's intended goal very very well.


Aruging ANY other point is demonstrating a fundamental misunderstanding of key attributes and behaviors inside the engine.


*Virtually: oil choice and weight can matter with long oil change intervals that degrade the oil with sludging and contaminates that then block the OMP lines leading to premature seal failure. Some oils can go longer without this problem than others, and thus can play a factor. But it is also a moot point if you swap to a SOHN.

reni04

@riwwp:You missed my point.I was only saying that i change my oil frequently and i never any where mentioned oil choice other than the tcw3 for my 200 to one mix for premix?.What are you talking about?. Your defending an disagreement that i never stated?.
My response was to superdan's comment that my changing my oil at 3,000 miles is a giant waste of money?. Loki is the only one here than gets it.He stated that changing oil more often is better than not.That's it that is the crux of the statement by me period.You totally misunderstand sir all due respect.

I never put forth any idea that one oil is better than any other.Again , my only statement or claim to fame here was that i change my oil every approx 3000 miles and that this can't hurt the motor and that i must be doing some thing correct and by that i ment changing oil more frequently is better than not and how on earth you guys come up with an argument is beyond me..

I also wanted to opoligize for taking the converstaion off topic my bad but understand riwwp i never talked about one oil; over another the thrust of my point was again that i change my oil every 3,000 approx and i am running bone stock and its running like new and i currently have over 95,000 on it and i must be doing some thing right.

Now on the topic about the sohn adapter: I have never used it because mazda did not design the OMP for piggy back attachments and don't misunderstand sir i am not saying the reason for the sohn adapter is a bad one because it is always better to get clean lubrication to any motor than dirty crank case oil.How does one aruge against that and that?.

My question here is: Are there any alternatives besides frequent oil changes instead of the sohn adapter?. I was wondering if i could remove the line the OMP that draws oil from the crank case and run it to a seperate container possitioned at the same level as the oil sump draw line?.Just asking not saying its a good or bad idea just asking?.

I don't believe there is any imperical evidence that the sohn adapter does or doesn't harm or shorten the life of the OMP.Remember i never brought up oil attributes. I only brought the fact out that frequent oil changes are good for my motor.Can i reroute the oil line from the oil sump to a different oil container and not use the sohn adapter?.

RIWWP

iTrader: (2)

This statement is the entirety of 9k's point, and mine.

This statement proves a fundamental misunderstanding of oil's importance in relation to the long term health of the Renesis.

THAT is what we are commenting on.

The ONLY choice about oil changes that matters for long term engine health is the frequency of changes, and even then it only addresses 1 of the many many failure methods.

Our point is that hanging your engine's lifespan ("I must be doing something right") on oil change choices is fundamentally WRONG. It's putting on blinders to all of the other reasons for failure, and we attempt to stop the spread of that mentality when we see it, because it is DAMAGING to people that read it and assume that oil choices are the only concern.

We see it all the time when someone comments on "religious maintenance", and then only mentions oil changes. To those of us that understand the problem, we want to scream out "WHAT ABOUT EVERYTHING ELSE!!!!"


It's not that you are 'arguing for something else', it's that you are yet another person unconsciously spreading the myth that oil decisions is why your engine is still good. It's not, so please stop.

RIWWP

iTrader: (2)

Basically, this is all the SOHN does. In order to change the oil pickup point, you have to insert something between the OMP and the crankcase oil supply. If you don't also supply an alternative oil at the same time, then you would have to modify the OMP itself to have different physical oil routing to whatever your other choice is.

Basically, any possible solution you can come up with is going to be a SOHN adapter. All it does is block off the crankcase oil, and supply whatever other source you want.

Yes, you can develop your own if you want, but it is probably going to cost far more than the price of the SOHN to develop.

reni04

You are corret sir when you say every one who made it that far(referring to 95,000) did so with there own fromula, i agree and that is all i was saying in the first place and this notion that i was saying one oil iis better over another is made up by 9x or dan50?
You are the only one who got it, and that was that my formula was changing my oil frequently and the response was "That was a waste of money" I responded to that saying how can changing your oil freqqueently a waste of money?.Thats it folks.

Thank you for understanding what i thought was obvious"But yes,changing oil more often is better than not", lol.

NOw i understand first hand what some talk about the rx8 club on other sites i have visited wow.This site is fun if nothing else.Thank you for acknowleing the fact that more frequent oil changes are better than less frequent oil changes.lol lol.

reni04

Thank you for the answer. I am going to study it a while and i'll come back this summer with the result as its 20 degrees here today and the weather doesn't allow for rx8 wwork in winter.I thought it was possible because i reasoned it issn't altering the OMP in any way just where the oil comes from.I only bring this up because the jury is out yet on weather or not the sohnen adapter has any adverse effects oin the OMP , as i stated before Mazda didn't design the OMP for any piggy back applications did they?.I'll be back on that project in the spring.

I already have a stainless steel container i will modify .The hard part is how to attach it to the car at the same level as the crank case.Sounds like a fun venture and can cause no harm aside from inventing a few new cuss words in the process lol.

RIWWP

iTrader: (2)

Have at it. We tend to like waky projects around here.

Though keep in mind that harm CAN come from it, if you end up making an error and blocking off oil feed without giving it an alternate source Design mistakes can and do happen...

MountainMike68

I wouldn't describe the Sohn adapter as a "piggyback application." It is much simpler than that and as far as the OPM is concerned there is no difference with or without it. What you need to keep in mind is that Mazda has far more concerns in designing a car than just simply making the best most reliable product in a given price range.

A lot of us did this mod, a lot of 8 owners didn't. How many people would have passed on buying the car knowing they had to monitor a second reservoir, fill it with special 2-stroke oil, or run the risk of killing the engine.

Even if the sales were the same there is no way Mazda would release something that requires more attention from the owner to maintain. No, the trend of auto manufacturers is make cars easier to drive and more idiot proof. Behind the wheel and under the hood.