991.1 Bore Scoring
04-23-2019, 12:14 PM
#61
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
04-23-2019, 12:24 PM
#62
Rennlist Member
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.
04-23-2019, 12:26 PM
#63
Addict
Rennlist Member
Rennlist Member
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.
04-23-2019, 12:31 PM
#64
04-23-2019, 12:39 PM
#65
Rennlist Member
Oil analysis is hit or miss. People put too much stock into a murky science at best. Go ask the E9x/S65 owners how effective their Blackstone Oil Analysis worked for them when many of them won their rod-bearing lottery shortly after a "successful" Blackstone analysis....
Empirical performance data is the most useful data. Mobil 1 has poor ASTM empirical performance data. This isn't a difficult concept.
Empirical performance data is the most useful data. Mobil 1 has poor ASTM empirical performance data. This isn't a difficult concept.
04-23-2019, 12:50 PM
#66
Three Wheelin'
Isn't this test posted earlier generally known to be a bull$h1t test for car engines???
04-23-2019, 01:04 PM
#67
Rennlist Member
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.
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.
04-23-2019, 01:10 PM
#68
Rennlist Member
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.
04-23-2019, 02:47 PM
#69
Three Wheelin'
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.
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.
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
04-23-2019, 03:02 PM
#70
Rennlist Member
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
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
04-23-2019, 03:35 PM
#71
Rennlist Member
They added additional oil-channels so more oil could flow on the cam lobes that were exhibiting excessive wear. Excessive wear is also mitigated by a better oil. Mobil 1 is an inferior oil, with inferior additives to mitigate wear. It scores poorly in all the ASTM performance metrics. All these FACTORS contribute to bore scoring and the like. This is not a one-dimensional problem, it's combinatorial.
In other words, nothing in the history of this particular problem tells us anything about the effect of oil/additive quality. Agree/disagree?
04-24-2019, 10:14 AM
#72
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?
Last edited by NuttyProfessor; 04-24-2019 at 11:01 AM.
04-24-2019, 10:32 AM
#74
Rennlist Member
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 your thinking?
"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."