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Oil thread with Lab Analyst
I am sorry if this post is too long but I would like to share some real facts with those who are interest in Oil topic.
I decided to start doing some real oil testings from my daily driver E24 M6 S38-B35 and also my Race Track car E24 M6 S38-B36 powered.
Well, the oil I have selected to use is only 10W-60 grade. My choices for now will be Red Line 10W60, Luquil Moly GT1 10W-60 possible other Oil brand but for now this is enough.
So hear are some fact for my daily driver. 88' M6 200k+ on original engine, never opened ! Purchased my car like 8 years ago with 102k miles. since then I have been using only 10W-60 TWS but since the price jumped big and not worth to spend so much money on oil change since I changing my oil between 2,500-3k miles max. Since I quit using TWS because of its ridiculous price I switched to Liquil Moly 10W-60. "0"-(zero) oil consumption in between oil changes.
Driving conditions- I have put 100k+ miles with "0"-(zero) engine problems! On cold start the engine oil light goes off almost before all 6cyl fire up, idle at~1000rpms when cold. No timing chain noise on cold start etc..
Now, I decide to go 5,000 miles and start doing oil changes from 5k down in testings. So my next test will be at 4k miles, next will be at 3k miles. I will be using the same oil for the race track and do some testings as well to see how it does hold on abuse!
Now hear is the most interesting part.
I spoke with the rep. from the oil lab about 45mins and he was veery patient with me since I had tons of question about this about that...And he explained to me that the oils I chose to discus such as Mobile-1 15W50, 10W60 TWS, Red line 10W60 etc... all they are very good and quality oils! And if you hear this from somebody that does test oil all the long and you are kind of on a cross road...
He pointed that the most important is how the particular engine accept the chosen oil from above. I believe he is right because for example my buddy with E46 M3 S54 did use red line 10w60 and at 3k miles the S54 eat about ~450ml of oil then he switched to Motul 10w60 for motor cycles and he has less oil use...My S38 does not touch the oil vs S54
Also we spoke that if an existing engine is worn out such as Bearings, Head gasket antifreeze leak, other ware etc.. the oil will not help, possible to reduce some ware but not proven.
We discussed as well that ZDDP big booo hooo I know its important. He said the oil I have chosen to test/use they are above average on ZDDP. The Liquil Moly is about 960 at 5k miles and I will see next time Red Line 10w60 and compare because they are claiming High on ZDDP. Again the rep. said that even it enough 900+.
Liquil Moly has very high Flash point at 5k miles almost 400 ! that is actually very good.
The Rep and I discussed my oil test result shows that my "Lead" is a hair over average. The Lead stance for bearing ware, in our S38 world rod bearing and since they are the original I do expect that. He said that the MOST important is this number not go over 10! then for sure their is something going wrong !
The rep. wants to see at 4k miles how this number will be. he thinks this number will go down when do I do at 3k(will see on my next oil test)
Reference- S62-B50 with the same Oil Test with little less than 4k miles oil change and 50k on original engine miles the "Lead" is 8+ I was actually kind of shocked because 200k miles S38 at 5k oil change has 5 lead vs S62 with less than 50k miles.
Soon at 4k miles I will report more details.
I will keep doing oil analyze and continue to report.
Last edited by First e28 M5; 5th May 2012 at 07:44 AM.