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For those of you that know me and my car on here, you know that I used Amsoil Series 2000 0W-30 synthetic for the first 60K, then Castrol Syntec 5W-40 for 10K, then Mobil 1 Extended Performance 5W-30 for 10K, and then Royal Purple 5W-30 for the past 54K. I have decided to switch to Mobil 1 0W-40 after 2 weeks of research into ZDDP levels, detergent levels and overall shear and high temperature viscosity characteristics. Mobil 1 0W-40 and Castrol Syntec 0W-30 are very highly recommended around different technical forums for all of their adherance to the above mentioned specifications. I noticed a slight increase in valve train noise after the swap to the 0W-40 from RP, but after about 100 miles of driving it has subsided.
I'm going to have a few UOAs performed over the next few months and determine how the chemical properties of the Mobil 1 0W-40 perform inside my motor. If they seem to stabilize overall friction wear, then I'll stick with it. Can't complain about $1.50 cheaper per quart either