Need oil change on high performance 468 BBC. What weight oil would perform best?
If you have over 1,500 miles on the engine, I would go with a good synthetic like mobil one, amsoil, royal purple, red line..
As far as weight, that depends on alot of things you didnt mention.. Like weather cond. where you live (temp wise)... Is the engine street, street/strip, full drag race, auto X or what?
What's the bearing clearances.. If its a performance/race build the rod and main bearings may be set up on the loose side.. That would need thicker oil..
Also is it a flat tappet cam, or roller cammed engine? Flat tappet needs a higher level of zinc in the oil.
W/o knowing the answers to the above I will just recommed a common use weight... Something like 10W30 to 15W40
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