Seems like weight has a hand in this? PAG recommends 0W40 but seems like many are running 5W40. Due to cold weather and/or cold start? Didn't know people ran 5W40 in LA but some do

Yes. 5 vs 0 provides better protection when hot. 0 is all about manufacturers hitting their MPG numbers. Lower viscosity, lower wear protection, better gas mileage.

Interesting, thank you for bringing that up. I assumed Mobil1 was still the same old good oil, wasn't aware of a decline in formulation.
It's not a religious issue to me, if Motul is provably better (and the above posting seem to indicate so) then I'll use motul. I just ordered some.

Ok lol yet another reason to switch, thanks bro. Auf wiedersehen m1 0W40

Used oil analysis is only as good as the lab that is used. Blackstone's unit averages and commentary lead people to believe their engines are ok when in fact, they aren't.

Isn't this test posted earlier generally known to be a bull$h1t test for car engines???



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No. The test is an actual ASTM test, likely carried out by SWRI, who Driven and even OEMS use for similar testing.

Perhaps you are thinking of a Timken Falex tester, which the results can be easily skewed depending on how the load is applied, but mostly by how much moly is present in the lubricant.

I agree, some labs are better than others. But oil analysis (spectroscopy) is still a inconsistent/murky method/science wrt oil. Especially with the varying quantity of additives high-end oils use, which further obfuscate the results.

These are some of the links that made me question it.....

https://www.bobistheoilguy.com/forum...Number=1584948
https://forums.noria.com/topic/4-bal...lick-marketing
https://www.eng-tips.com/viewthread.cfm?qid=38168

Brinelling is brinelling.

Even the best oil won't do a good job if it doesn't reach the surfaces that need lubrication. Now that Porsche has made the necessary engineering changes, we might find that a GT3 engine with Mobil 1 fails in 221,144 miles while one with your oil of choice makes it all the way to 223,930 miles. Conversely, an unmodified engine might frag itself in less than 50K miles through no fault of the oil.

In other words, nothing in the history of this particular problem tells us anything about the effect of oil/additive quality. Agree/disagree?

Oil Analysis is essentially "Tribology" which is a branch of quite many scientific fields such as Chemistry, Engineering, and Physics. Tribology is a highly disciplined quantitative research science. Oil analysis is not spectroscopy. Tribologists use spectrometers and FTIR. Maybe that's what you're thinking?

Why is this graph considered relevant to Mobil 1 0W-40?

I suggest you read this: https://www.blackstone-labs.com/abou...-oil-analysis/

"Spectral exam:
In the spectral exam, we take a portion of your oil sample and run it through a machine called a spectrometer. The spectrometer analyzes the oil and tells us the levels of the various metals and additives that are present in the oil. This gives us a gauge of how your engine is wearing. To learn more about the elements we look at and where they come from in your oil, go to our Report Explanation page."

Wow. I can't believe I stumbled upon this thread. I thought it was just us M96/M97 owners that had this bore scoring problem.