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.
I suppose I could switch to 15W50, but at $7/Qt:
Quote:
Product Description
Mobil 1 15W-50 is the most advanced performance synthetic engine oil designed to provide the cleaning power, wear protection and performance reserve to keep engines running smooth and clean.
Features and Benefits
Mobil 1 15W-50 is formulated with SuperSyn, an extra high-viscosity synthetic fluid, plus extra anti-wear additive to provide extra protection for severe service applications.
Mobil 1 15W-50 is recommended for high performance vehicles including turbocharged and supercharged engines where a thicker oil film is desired.
Mobil 1 15W-50 is also recommended for older valve train designs that may benefit from a higher level of anti-wear normally not required for newer generation vehicles.
Mobil 1 15W-50 will also provide better anti-wear protection for higher valve spring tensions in certain racing engines.
