Used Oil Analysis - Post Them Here
 

Okay, let's discuss our UOA's. Post em' Up!

http://www.bobistheoilguy.com/engine-oil-analysis/

While not engine oil, the link to the BHR Eneos 75w-90 test is here.

What about the ash?

Yeah I contacted Charles about some Eneos. I want some 0W-50.

Not sure. I'm a little skeptical about the results though because my motor is not "new", but rebuilt.

https://www.rx8club.com/attachment.p...6&d=1249245814
https://www.rx8club.com/attachment.p...7&d=1249245814
https://www.rx8club.com/attachment.p...9&d=1249245814
https://www.rx8club.com/attachment.p...8&d=1249245814
#1 havoline 10-30
2-havoline 10/40
3- castrol 10/40
4- shell diesel oil
1k mile change
see why i like diesel?
od

OD which of those 4 oils are mineral oils and which are synthetic?

they are all dino.
havoline is popular in this area and many also run the castrol.
the shell diesel is the Rotella name bran
I would like to see some syns posted.
OD

I'll have some synthetic data but it's going to be a few thousand miles before I do.

Thanks for the info. I was curious because normally synthetics don't shear nearly as much as dino oil so that could have solved your low viscosity problem.

Mine is GC 0W-30. I already have a sample kit waiting for my next 3k oil change.

Yeah I want some 0W-50 Eneos too!

Here is a link to a post where I have posted several reports along with comments. Diesel oil rules!!!

https://www.rx8club.com/series-i-tech-garage-22/oil-report-results-147795/

It will be interesting to see a longer interval. I'm curious to see what happens to your fuel percentage, given your practice of allowing the car to idle up to temperature before driving.

As an aside, it would be worthwhile for people to report weather they do full or partial oil changes for any given report.

George

After my break in I did a max out oil change (got 5 quarts out)) from Mazda 5W-20 to GC 0W-30. Then I ran another 1500 miles and did another max out oil change (about 4.5 quarts this time). So this sample should have been all GC 0W-30. This time will be a full 3,000 mile OIC.

glad to have another diesel oil believer!
OD

Also, is anything over 15W diesel oil?

Here's another data point. The first two samples were using Castrol GTX 5w-20. The last one was 5w-30. The car was actually an '04.

Thanks man, I ran castrol 10W-30 in my second engine with 3,000 mile OIC and it lasted 72,000 with almost no premix.

I didnt know we could use diesel oil..

Yeah it's pretty commonly used (in rotaries and in Huge Dodge Trucks :yelrotflm).

In regards to the RX8 I wouldn't count a group of less than 5 people common.

oh, I meant amongst rotaries in general!! Fixed.

diesel oil may be used more than some realize---? Maybe not by the rx8 gang.

From a well known engine builder:
Yes you can run diesel oil in gas engines.. In fact most performance guys has went fully to diesel oils now due to the EPA pulling the zinc out of pass. car oils.


high amounts of ZDDP is needed in flat tappet cam'ed engines (older, non roller cam)

Due to the lower ZDDP levels alot of people has wiped out a flat tappet cam lobe in their engines.

EPA is now messing with the diesel oils too.

The new pass car ARI rating is SM and it sucks as far as anti wear goes...

The new diesel oil API rating is CJ-4 even though its much lower in ZDDP than the CI-4 oils it still has much more zinc in it than the SM gas engine oils
Source(s):
Performance/Race engine builder, 12+ years

OD

So what specifically is diesel oil?

diesel oil is a better base stock with a different additive package---read on it.
OD