Aside from EP having a higher price point, and slightly higher percentage of PAO basestock than AFE, are there other substantial differences between these 2 lubes?
Are you sure there is a higher percentage of PAO between these two? AFE is touted to have quite a bit of PAO. The primary difference that I see is that EP is **guaranteed** to last 15K, AFE is not guaranteed for any mileage (though it in the past it was a 10K oil--if memory serves). In my
2010 FX4 UOAs I was not "amazed" by EP over AFE (for runs to 15K or slightly over). If it were mine, I would save the extra $$ (even though it is only a few) and use AFE with a synthetic oil filter for 12K-15K OCIs and run a couple of UOAs to check TBN to set a trend.
