Can we use 5-20w Mobil Full Syntetic oils on the 8?
08-16-2010, 10:08 AM
#26
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no you missed the point Marklar.
MNOA cannot choose to dishonor a warranty. they either can or they cant legally. theres not much if any gray area left. its all been hashed out in court before. If MNAO reccomended mineral oil, its just that. a Reccomendation. Find something from MNAO that says you MUST use mineral oil, and then you can get be right
MNOA cannot choose to dishonor a warranty. they either can or they cant legally. theres not much if any gray area left. its all been hashed out in court before. If MNAO reccomended mineral oil, its just that. a Reccomendation. Find something from MNAO that says you MUST use mineral oil, and then you can get be right
08-16-2010, 10:17 AM
#27
no you missed the point Marklar.
MNOA cannot choose to dishonor a warranty. they either can or they cant legally. theres not much if any gray area left. its all been hashed out in court before. If MNAO reccomended mineral oil, its just that. a Reccomendation. Find something from MNAO that says you MUST use mineral oil, and then you can get be right
MNOA cannot choose to dishonor a warranty. they either can or they cant legally. theres not much if any gray area left. its all been hashed out in court before. If MNAO reccomended mineral oil, its just that. a Reccomendation. Find something from MNAO that says you MUST use mineral oil, and then you can get be right
08-16-2010, 10:27 AM
#28
In the US, a 2006 manual (my car) states nothing of the such, only what is "recommended" with no reference whatsoever to synthetics in the manual.
IIRC, all US years except 2009+ state nothing against synthetics.
08-16-2010, 10:31 AM
#29
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Yea Mazda can't do excrement about what oil you use as long as it's got the normal engine oil certifications. The owner of Royal Purple drives an Rx8, get's warranty service, and uses his products. LOL Mazda need to get on the ball. GM has reps going around forums talking to customers getting feedback on Camaro and Vette. Mazda need improve image with modern sports cars and what not. 5-20 should be illegal in rotary engines.
08-16-2010, 10:34 AM
#30
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The correct wording in the manual says to 5W20 oil is recommended. It says nowhere in the manual that synthetic CANNOT be used. In fact, most manufactures do not 'recommend' synthetic. I would re-read the manual, and take it from there. If you allow any dealership to **** you, they will. And if this is gray area, it's not your job to inform them while giving them an excuse to void a warranty for a $4k job. What the hell can they say? You have no receipts, so your warranty is void? Change your own oil, and take your car for routine check ups. If you're on record for the visits, and you take the car back to them to have your engine warrantied, they can't say ****. They'd have to eat it.
Last edited by pking1122; 08-16-2010 at 10:40 AM.
08-16-2010, 10:41 AM
#31
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but regardless, that isnt the point. the point is, MNAO can recommend, specifically warn, or threaten with resulting death it doesnt matter...
08-16-2010, 10:43 AM
#32
My owner's manual specifically says: " "Do not use either synthetic or semi-synthetic motor oil."
If your year model doesn't have that in your owner's manual, then you may have a leg to stand on. But Mazda started adding that to the owner's manual for a reason.
If your year model doesn't have that in your owner's manual, then you may have a leg to stand on. But Mazda started adding that to the owner's manual for a reason.
08-16-2010, 10:58 AM
#34
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Only on gearhead car forums like this. In fact, every auto manufacturer recommends a particular oil (or range of oil viscosities) for every engine they design. In North America, Mazda recommends 5W-20, non-synthetic. Which, I'd wager, is what 98% of American RX-8 owners have happily used since day one. (Whether they bother to check it or change it regularly is another matter.)
Of course, there's nothing Mazda can do to keep you from using any oil you want. 5W-30, 10W-40, synthetic… hell, you can use Oil of Olay if you believe the engineers who designed the Renesis know less about rotary engine design and motor oil than you. I suspect if you visit any sports car forum you'll find a multitude of oil recommendations from the many thousands of armchair petrochemical engineers and engine designers out there.
Remember, this is America - and this is the internet. You don't need a fancy schmancy degree in mechanical engineering or petrochemicals to be an expert on, let's face it, what is a pretty simple subject. Everyone can be a petroleum/rotary engine expert. Even you.
Of course, there's nothing Mazda can do to keep you from using any oil you want. 5W-30, 10W-40, synthetic… hell, you can use Oil of Olay if you believe the engineers who designed the Renesis know less about rotary engine design and motor oil than you. I suspect if you visit any sports car forum you'll find a multitude of oil recommendations from the many thousands of armchair petrochemical engineers and engine designers out there.
Remember, this is America - and this is the internet. You don't need a fancy schmancy degree in mechanical engineering or petrochemicals to be an expert on, let's face it, what is a pretty simple subject. Everyone can be a petroleum/rotary engine expert. Even you.
And I'm sure that you'll find just as many oil threads on other car forums. People are always trying to find the magic combo when it comes to oil. But, no one will ever get it perfect there's just to many variables (driving conditions, driving habits, Amp temp, car mods, etc. etc)
OP the best thing you can do is pick a oil with a good rep. and just change it every 3k. Don't forget to check the levels regularly
08-16-2010, 11:39 AM
#39
Fair enough, I'm just getting tired of people calling bullshit.
Nowhere have I said that synthetic oil is bad for rotaries. What I've said is that MNAO can choose to not honor the engine warranty if they have evidence that you've used synthetic oil. That's just a fact, they can do it and they have done it.
I know people who have tried to sue under Magnuson-Moss. It's not something you want to have to do. Being right doesn't mean you aren't going to take it up the ***.
Nowhere have I said that synthetic oil is bad for rotaries. What I've said is that MNAO can choose to not honor the engine warranty if they have evidence that you've used synthetic oil. That's just a fact, they can do it and they have done it.
I know people who have tried to sue under Magnuson-Moss. It's not something you want to have to do. Being right doesn't mean you aren't going to take it up the ***.
08-16-2010, 11:41 AM
#41
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Main thing I wanna show is that pics of SYNTHE-RENESIS that is fully synthetic, PAO blaa blaa is sold by Mazda so i doubt they would void warranty work.
08-16-2010, 12:13 PM
#43
nycgps, you're missing the point. It doesn't matter if synthetic is fine for the engine, it doesn't matter if you're using Idemitsu Racing Rotary Oil.
If you give MNAO an excuse to deny a warranty claim and they take it, you're screwed. It doesn't matter who is right or wrong about the oil.
And if you think that taking MNAO to court will have a good outcome for you, you're out of your mind. They don't have to prove that synthetic oil is bad for the engine, they just have to show the owner's manual and that's that. If they can show that you didn't follow recommended maintenance, then they can choose to not honor the warranty, case closed.
If you give MNAO an excuse to deny a warranty claim and they take it, you're screwed. It doesn't matter who is right or wrong about the oil.
And if you think that taking MNAO to court will have a good outcome for you, you're out of your mind. They don't have to prove that synthetic oil is bad for the engine, they just have to show the owner's manual and that's that. If they can show that you didn't follow recommended maintenance, then they can choose to not honor the warranty, case closed.
show the owner's manual what?
I think you're the one thats missing the point.
Re-read, and try harder next time.
You need to search.
08-16-2010, 12:19 PM
#44
try to go to your local dealer and see what kind of "recommended" oil they use"
99% of the time you will see they use "synthetic-blend" kind of 5w20. ----- Motorcraft synthetic blend 5w20.
not to mention, you HAVE TO HAVE some sort of Synthetic based stock in to make the "5w20" magic ...
You have a lot to learn buddy.
Whoever came up with that "no synthetic" oil bullshit has no idea how oil works/form. MNAO hired too many useless morons ... this is also why Mazda is always behind the rest of the Japanese manufactures.
08-16-2010, 12:24 PM
#45
08-16-2010, 12:51 PM
#46
Use whatever the f**k oil you want to god damn use if you are a DD, just make sure to change it regularly and check the levels. You all freaking act like oil is some miracle. Jesus... just use damn 10w-40, its the most balanced for all freaking drivers.
And btw, Marklar, i think nyc means that they cant just look at your oil and say "oh dam eff you no warranty". If you go up to them and state or show you are using synth then they COULD (they dont like giving away motors....) be like "oh hey look, it says here on your oil cap 5w-20, but you used this...ahh... i dont want to give you a new motor). Most drivers dont know any better and will walk away.
08-16-2010, 12:55 PM
#47
The guy who had his claim denied had one--yes it's silly but just one--oil change receipt that said synthetic on it.
Like I said above, if you're going to use synthetic it's a good idea to be careful of what your receipts show.
Like I said above, if you're going to use synthetic it's a good idea to be careful of what your receipts show.
08-16-2010, 01:02 PM
#48
If you are changing oil, know the dealership "rules". If they say "are you using synth" .. "no sir im using 5w-20". Make sure if you are using synth or an alternate grade, you purchase from a place that doesn't state the grade (walmart). Understand that alternate grades wont effect your warranty (recommended 5w-20 isn't the same as ONLY 5w-20).
As far as oil goes, there is no "magic" number. Each oil is different and different oils will better suit different drivers. For the granny shifter, they wont really need the same oils as the spirited driver. Like i said, you can search till you pass out from lack of sleep, you arent going to find one definitive answer. But if you took all the answers, put them in a magic hat and pulled out one, it would probably say "dino 10w-40" as that has become the "safest" and "best of both worlds" for both warm and cold climates.
Again, i dont think there is concrete proof that today's synthetics cause engine failures, and there are TONS of people on this forum that use synthetics. If you want to use it, do it up, there is no point in asking anyone's opinion. Trust me, if synthetic oil lreally blew up rx8 engines, the answer wouldn't be so hard to find.
With this car its all about maintainance. If you want to use xyz grade oil, you better damn well sure be maintaining so that there is no excuses for failure on your part.
08-16-2010, 01:11 PM
#49
Registered
There are also two service bulletins, I believe one from Australia and one from the Netherlands, that have been posted here saying to not use synthetic. They show carbon deposits clogging a port, and say it's due to synthetic.
Not taking sides...just adding more fuel...er, I mean facts...to the fire.
Ken
08-16-2010, 01:27 PM
#50
No manual here states not to use synthetics and we still have the weight vs temperature charts 
5w30 and 10w30 is what they say to use. 10w40 is what I use.
Instead of going abstract here i'd like to make it clear to the OP that mobil is not the right oil NOT because it is a synthetic but because it doesn't mix well with fuel. If you had a sohn adapter though..
5w30 and 10w30 is what they say to use. 10w40 is what I use.
Instead of going abstract here i'd like to make it clear to the OP that mobil is not the right oil NOT because it is a synthetic but because it doesn't mix well with fuel. If you had a sohn adapter though..