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Bought some yesterday at Advance Auto parts on sale, buy one get one free. I have excessive oil pressure at start up even in the summer months of 85 psi with 20W 50 synthetic blend and want to try a different oil. This motor is a high performance Pontiac 474 (1970). Is the 5W 50 a good choice...

Is there any concern switching an older motor raised on dinosaur oil to a synthetic. I' be always heard the thinner synthetics will leak thru the older gaskets.

What kind of oil filters do members like to use? I use K&N on my Pontiac 474, Wix on my Silverado and Nissa Rouge and Motorcraft on the daughters Mustang. What filters have the highest ratings?

A friend of mine has an unusual oil pressure problem I never heard of. It's a new rebuild of an AMC 390 in a '69 S/C Rambler. When he accelerates his oil pressure goes DOWN. We checked with a different gauge and same result. Ran it a quart over full, still same result. A friend suggested maybe...

Thanks for your replies. I believe the main bearing clearances are .030. When I start this motor, even during the summer months the oil pressure gauge goes clear to 85psi. I've been concerned about that. Is synthetic the clear choice? I was thinking Castro Syntec 5w50 Redline 5w50 or Mobile 1...

Hello all! I just discovered this forum and this is my first post. Oil is a subject that is always debated, ask 100 different people and get 100 different opinions. I've got quite an education reading through Bob's oil university papers, but I'm still a little uncertain if I'm using the right...