"Help me interpret UOA information [Re: OVERK1LL]
FrankN4 FrankN4
This was not any sort of test that I/we conducted. We went to the used oil analysis forum on this site. We took what we beleived to be the five most common synthetic oils: Mobil 1, Pennzoil Platnum, Valvoline Synpower, Castrol Syntec, and Quaker State Q. We made a column for each of the oils. In the coulmn for that oil we put the OCI and the ending 100C cSt compared to the starting 100C cSt. We were then going to average the OCI and ending 100C cSt. We looked for contaminants, fuel, antifreeeze and things that could slip in through the air intake. If we believed the OCI was ridicilous and not a true indication we tossed that out. For example we had one OCI of 20,000+ miles and the ending cSt was 16+.
We discovered that Mobil 1 sheared down past 9.3 less than the other 4. We found that Pennzoil Platnum sheared down past 9.3 the most(2973 miles on the low side and 4818 miles on the high side) and thickened above 10.2, its starting 100C cSt, the most(5300 on the low side and 9352 on the high side).
We just plain old turned chicken and decided we were just going to add fuel to feuding fires, and terminated the research because we were no longer convinced that it would accomplish anything we wanted. It really depends on the vehicle, maintenance habits, driving habits, driving conditions, and much more than just the brand and grade of oil.
We may go back some day and research the UOA forum and check every 5w30 oil looking for nothing but a trend. That is the only thing I think is really worth researching, now.
To compare 0W to 5W to 10W seemed to work out rather well. It was an eye opener for me. To try to determine the best brand of XW-30 compared to other brands of XW-30 is a little beyond my willingness to invest time and effort. Even if you looked at UOA from same year/size/type engines, you still don't really know the driving habits, maintenance habits, driving conditions, and other needful information."
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We are now far enough back on the UOA forum where some SL oils are starting to show up. We are very careful not to get any SL oils in the analysis. We expanded our analysis to include Iron, Lead, and Copper wear metals. We are looking at remaining TBN where reported.
We saw a commerecial where Ford braged that their cars were NOW just as good as Toyota. This got us to thinking that maybe we should have a base/comparison, so.... we decided to use Amsoil 5w30 as our base/comparison for the group 4 oils and Amsoil XL 5w30 as our base/comparison for group 3 oils.
We do seem to see two trends developing but are going to double, triple, etc... check our research.
Everything will be on hold for a few days as I am heading out tomorrow night/Monday morning, with two grandsons, on a fly fishing trip for mountain brook trout.