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-   -   Used Oil Analysis - Post Them Here (https://www.rx8club.com/series-i-tech-garage-22/used-oil-analysis-post-them-here-184241/)

9krpmrx8 10-09-2009 10:36 PM

Used Oil Analysis - Post Them Here
 
Okay, let's discuss our UOA's. Post em' Up!

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

Flashwing 10-09-2009 11:04 PM

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

@!!narotordo 10-09-2009 11:05 PM

What about the ash?

9krpmrx8 10-09-2009 11:06 PM

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

9krpmrx8 10-10-2009 08:44 AM


Originally Posted by @!!narotordo (Post 3271100)
What about the ash?

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

olddragger 10-10-2009 10:53 AM

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

Flashwing 10-10-2009 03:45 PM

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

olddragger 10-10-2009 05:04 PM

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

Flashwing 10-10-2009 05:22 PM


Originally Posted by olddragger (Post 3271757)
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.

9krpmrx8 10-10-2009 10:11 PM

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

@!!narotordo 10-10-2009 11:40 PM

Yeah I want some 0W-50 Eneos too!

rx8convert22 10-11-2009 02:39 PM

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/

GeorgeH 10-11-2009 05:47 PM


Originally Posted by 9krpmrx8 (Post 3271386)
Not sure. I'm a little skeptical about the results though because my motor is not "new", but rebuilt.

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

9krpmrx8 10-11-2009 06:30 PM

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.

olddragger 10-11-2009 07:25 PM

glad to have another diesel oil believer!
OD

9krpmrx8 10-11-2009 07:57 PM

Also, is anything over 15W diesel oil?

Go48 10-12-2009 07:37 AM

1 Attachment(s)
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.

9krpmrx8 10-12-2009 11:18 AM

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.

05rx8mazda 10-12-2009 11:29 AM

I didnt know we could use diesel oil..

9krpmrx8 10-12-2009 04:29 PM

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

Flashwing 10-12-2009 05:04 PM


Originally Posted by 9krpmrx8 (Post 3274548)
Yeah it's pretty commonly used.

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

9krpmrx8 10-12-2009 05:08 PM


Originally Posted by Flashwing (Post 3274597)
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.

olddragger 10-12-2009 09:48 PM

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

9krpmrx8 10-12-2009 09:49 PM

So what specifically is diesel oil?

olddragger 10-12-2009 09:56 PM

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


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