shadycrew31

iTrader: (6)

Always check the oil when it is warm, if you have just changed the oil let it run for a few minutes then check it.

maxchao

iTrader: (2)

and the reason being? (Thanks by the way)

So this is what I don't get. By warm does it mean after the engine gets warmed up, shut the engine down, wait 5 minutes and check it, or check it while the engine is still running?

It feels like every minute passing by after the engine shuts down the oil level changes a little bit. Maybe I am just panaroid.

1.3_LittersOfFurry

iTrader: (4)

The reason behind it is because thats what the manual states.

When you get back from a drive turn the engine off wait 5mins then check the level. Keep it right below full.

paimon.soror

iTrader: (15)

Thermal expansion.

Harlan

iTrader: (3)

Oil level changes after you shutdown because every surface of the engine has an oil film on it and all the passages are full. After a few minutes most of this oil returns to the pan. If you run large equipment you will see quite a difference in oil level between when you shut it off and 15 minutes later.

MikeTyson8MyKids

iTrader: (1)

Update: I sprayed out and soak the oil injectors last night, and the check valves are all passing now. So, for the sake of experimentation, I'm only changing the lines. My lines have darkened quite a bit, and I can't tell the difference from the outside if oil is in them or not.

I'll give it a few thousand miles and see if they remain unstuck. If so, that could save a lot of money for other people in the future.

My RX is used only in autox and fun now, so a couple thousand miles may be this fall.

j9fd3s

have you ever checked the oil level with the engine running vs after its been shut down for a few minutes?

i haven't tried it on the Rx8, but its a good parlor trick on the older rotaries, as the oil level is the same....

Harlan

iTrader: (3)

I haven't with this engine, but working with big diesels it's an obvious difference. On most piston engines it's a half quart or so difference.

maxchao

iTrader: (2)

In this case, wouldn't checking the oil level after it sits for a long time to yield a more consistent result? ie all the oil that should return to the oil pan has returned to the oil pan.

That is what I observed as well. Every minute after the engine shuts down the oil level increases a little. Checking the engine oil in the morning after the car has not been running for so long gives me a more consistent result, but that is not what the manual says.

CRO8TIA

Keep doing it your way Maxchao,you can't get a better reading any other time.Ask any professional truck driver, machine operator . They always dip the oil before first start up.It's called preventative maintenance.

TeamRX8

iTrader: (25)

the RX8 dipstick has a 1.5 qt range so any minor variation is basically irrelevant

just to prove the point, I've raced on it with 1 extra qt over the max mark and down near the min mark without issue

maxchao

iTrader: (2)

I thought I read it somewhere filling over the max mark is going to have oil sucked into the intake manifold and dirty the valves inside? or am I dreaming again?

I check oil probably every few hundred miles just to make sure the engine is still burning oil, since it is very critical that it does. So at 1qt/1k miles we are talking about maybe 0.5 qt here...which seems to be around where the engine oil level difference is between warm and cold engine.

Also if people don't mind me start another heated discussion...if the OMP is indeed positive displacement pump, then how can the nozzle get clogged...? The oil has to go somewhere no?

Harlan

iTrader: (3)

Back to original thread, I just rebuilt an 04 with 96k. Internals were in great shape with minimal wear. All 4 oil injectors were clean with working check valves. Only things wrong with the engine were weak side seal springs and the side seal gaps were huge (all greater than 20thou some much wider). I think it was assembled by Mazda on a Monday, no it was not a remain.

rotaryPilot

Ok it is very interesting because something similar happened to me.

After changing oil I am pretty sure that with hot engine the oil level was exactly at max indication. Since then I was heavily premixing and I found out that the oil level is not going down ! I used to see 100ml oil consumption every 200kms with my driving habits but to my surprise oil level at the dipstick was constant !

I started to suspect clogged OMP injectors/lines but that was not the case after a check that was conducted. To make matters worse , sometimes while measuring the oil I saw oil level increased ! I started measuring the oil level on a dead cold engine at the morning. After that I suspected antifreeze or fuel mixing with my oil but again that was not the case because antifreeze level was constant and the oil appearance was not indicating fuel mixing.

Finally, the oil level started decreasing after 1300kms which is too slow concerning my driving habits.

You can say that there was too much oil at the beginning after the oil change but I guess not because there were times in the past that had overfilled oil pan with oil and never had NO OIL CONSUMPTION and OIL INCREASE LEVEL !!!!

You can even say that I do not know to measure the oil level correctly BUT It would sound strange not knowing to measure oil level after 196.000Km with the same car !

j9fd3s

if you drive the car hard, the oil will get diluted with gasoline and oil level will go up.

1.3_LittersOfFurry

iTrader: (4)

??? I drive the **** out of this car and my oil level only drops....

rotaryPilot

how is this possible ?

MikeTyson8MyKids

iTrader: (1)

This thread is all over the place.

Update: Put new lines on. New gaskets and washers on as well. Buttoned it all up and started it. Watched oil slowly come up all 4 lines from the OMP.

Now, I have an autox 200 miles away 1 way Saturday, so we'll see if this translates into oil consumption. I will still be premixing.

Paco664

i stopped premix for 2 tanks and instead added 1oz per gallon of Marvel Mystery Oil....

the car seems to prefer this to 2cycle oil.... with a noticible improvement in starting/accelleration/etc..... *(mpg stays at a constant 14mpg... **(damn you right foot!!))

j9fd3s

fuel get past the oil control rings into the sump... its pretty well documented, and actually easy to find, pull dipstick and smell it, if it smells like gasoline...

shadycrew31

iTrader: (6)

This thread is hilarious.

Obviously the quart of oil your engine is supposed to use in 500 miles is replaced with fuel and oil in those 500 miles. In some cases more fluid goes into the oil pan than what is actually used!!!

HOW???

SCIENCE!!!

Seriously guys? Come on...

Paco664

?? elves???
their plan..
step 1... add oil at night while owner sleeping..
step 2... ????
step 3... PROFIT!!

Harlan

iTrader: (3)

Compression leakage past the side seals and oil control rings is very common. Change oil on a low compression engine and you will smell the gasoline in the oil easily. It's not that big a deal, but it is a good reason to change your oil regularly.

rogi559

Hows the bhr ignition working thinking about
Upgrading mine.

Rudolph

I have my engine oil tested........there is no fuel and no water dilution.........this makes me believe that with heavy premixing some 2 stroke oil is getting resolved into the 4 stroke engine oil as reported in my previous posts; as well as reported by fellow-Rexdrivers and rotary aviation pilots .........