...All New Engine, Tighter Tolerences, I will 'Break it in' with a thinner oil. I use 10W30 Castrol GTX Turbo. After 10,000 to 20,000 Miles, I may go to 20W40 then 20W50 (much later and then over 90 Degrees Ambient temps). 'Oil Experts' I have talked to, would never put the 'Thicker' Oil in a Brand-New Engine, it just would not get through the .001" clearences; not 'In-Time' anyway...
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