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Used Oil Analysis - Post Them Here

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Used Oil Analysis - Post Them Here

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Old 10-09-2009, 10:36 PM
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TX Used Oil Analysis - Post Them Here

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

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

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Old 10-09-2009, 11:04 PM
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While not engine oil, the link to the BHR Eneos 75w-90 test is here.
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Old 10-09-2009, 11:05 PM
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What about the ash?
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Old 10-09-2009, 11:06 PM
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Yeah I contacted Charles about some Eneos. I want some 0W-50.
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Old 10-10-2009, 08:44 AM
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Originally Posted by @!!narotordo View Post
What about the ash?
Not sure. I'm a little skeptical about the results though because my motor is not "new", but rebuilt.
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Old 10-10-2009, 10:53 AM
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Old 10-10-2009, 03:45 PM
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OD which of those 4 oils are mineral oils and which are synthetic?
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Old 10-10-2009, 05:04 PM
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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
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Old 10-10-2009, 05:22 PM
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Originally Posted by olddragger View Post
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.
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Old 10-10-2009, 10:11 PM
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Mine is GC 0W-30. I already have a sample kit waiting for my next 3k oil change.
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Old 10-10-2009, 11:40 PM
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Yeah I want some 0W-50 Eneos too!
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Old 10-11-2009, 02:39 PM
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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/
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Old 10-11-2009, 05:47 PM
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Originally Posted by 9krpmrx8 View Post
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.

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Old 10-11-2009, 06:30 PM
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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.
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Old 10-11-2009, 07:25 PM
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glad to have another diesel oil believer!
OD
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Old 10-11-2009, 07:57 PM
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Also, is anything over 15W diesel oil?
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Old 10-12-2009, 07:37 AM
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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.
Attached Thumbnails Used Oil Analysis - Post Them Here-oil-analysis-rx8.jpg  
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Old 10-12-2009, 11:18 AM
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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.
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Old 10-12-2009, 11:29 AM
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I didnt know we could use diesel oil..
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Old 10-12-2009, 04:29 PM
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Yeah it's pretty commonly used (in rotaries and in Huge Dodge Trucks ).

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Old 10-12-2009, 05:04 PM
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Originally Posted by 9krpmrx8 View Post
Yeah it's pretty commonly used.
In regards to the RX8 I wouldn't count a group of less than 5 people common.
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Old 10-12-2009, 05:08 PM
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Originally Posted by Flashwing View Post
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.
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Old 10-12-2009, 09:48 PM
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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

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Old 10-12-2009, 09:49 PM
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So what specifically is diesel oil?
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Old 10-12-2009, 09:56 PM
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diesel oil is a better base stock with a different additive package---read on it.
OD
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