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Thanks. Appreciate the replies and information.

This is the Factory AMC 304 V8 in my '79 CJ5 Jeep.

The oil, when Hot, is very thin, almost water-like. Still, I really like using Synthetic motor oil.

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It's probably not just the thin oil - AMC V8's have a history of low oil pressure from the aluminum pump body growing faster from heat than the steel gears, which opens up the clearences and lets pressure drop. Thick oil will probably help, at the expense of high oil pressure at start-up.