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Originally Posted by JFP in PA
Currently, we use Castrol Syntec 10W-40 (ACEA A3, B3, B3), which continues to demonstrate very good UoA's. We looked at their 5W-40, but found the 10W-40's ability to stay in grade and demonstrate better TBN's than the lighter version, particularly in M96's that are run hard. The Castrol Syntec line has continued to demonstrate consistent performance over several years. But as many oils "used to be good", we continue to evaluate the Castrol Syntec 10W-40 regularly in our "Trust; but verify" program.
There are a lot of good oils out there, but you need to cut through the marketing hype and look at hard data to make an informed choice. If you want to understand more about oil parameters, take a look at the BITOG website; you will find more data than you ever wanted on all types of lubricants........
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You can kill days of your life reading the BITOG site
That said, there is an obscene amount of information to be had there.
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