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Thanks! You have been very helpful. There were still flatheads around then but the Buick was using overhead valve. I'm sure you are right about it being low loaded so anything out there today will maintain a film.

Originally Posted By: artificialist Originally Posted By: Straight8 The product information sheet shows a 20-W CF and a 20-W CF2 as well. I assume I can get that by special order. CF-2 oils were specially made for Detroit Diesel 2 stroke engines, and the ZDDP was lowered because the engines...

Originally Posted By: Chris142 Originally Posted By: Straight8 I feel comfortable with the 30 weight in it but having the oil pressure gauge in the high zone most of the time is a bit of a concern. The guage is probly wrong. You should install a new mechanical guage and see what the oil pressure...

A 5W20 would allow me to start it in the winter without preheating. It's readily available too. One ad (which I realize is a biased source of info) for an additive mentioned that the metal and mineral additives will still be in place for the dry start in the spring after everything has drained down.

I feel comfortable with the 30 weight in it but having the oil pressure gauge in the high zone most of the time is a bit of a concern. I haven't seen 20W20 on the shelves at all. I'm sure someone could order it for me if it was worth the trouble.

Thanks that helps. Some comments on a hotrodding site got me looking at the zinc aspect. Many of the hotrodders are running later model modified engines. Different than mine. I'll see how the straight 30 works for me this year and will feel more comfortable trying a multigrade next year. What...

This looks like a good thread to hijack to talk about my 52 Buick. (at least I can show some effort went into searching the subject) My 52 Buick has a straight eight 263 engine. The manual reads pretty much the same as the '38. The heaviest oil that it recommends is 20-W at not lower than 32F...