I have a 1966 Corvette with a totally rebuilt 427 L72 425 HP, a vintage 1966 block cast Feb 1966 ..engine was bored ,030 over /block decked in 1994 . have installed comp cam extreme energy hyd flat tappet cam 4 years ago & endlebrock alum heads 7 years ago.do my own mechanical work ....ocasionally run the 1/4 mile oldies day at new england dragway best et 13.3 @ 105 MPH ....... RPM is limited ( by me ) to 5700 RPM . broke engine in on conventional 10/30 dinosore oil , then Moble one 4 quarts 10/30 & two quarts 15 /40 ..6 total , when i did cam broke cam in with conventional oil & then went to moble one again... so my story is since 1995 synthetic oil no problems , good pump ability i driove my Corvette hard approx 2,000 miles a season & moble one has worked for me ....no leaking or or burning
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