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post #1 of 3 (permalink) Old 05-29-2018, 05:03 AM Thread Starter
 
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Oil type GTO 67

Hi gents

Anyone who knows original spec for engine oil, transmission and rear axle?
Itīs orginal matching numbers car with 400 (335 hp), TH400 and for the moment i cant remember which rear axle.

What type do you use?
10W40?
20W50?
High Zinc?

Best Regards
Marcus
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post #2 of 3 (permalink) Old 05-29-2018, 06:30 PM
 
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Originally Posted by Viking13 View Post
Hi gents

Anyone who knows original spec for engine oil, transmission and rear axle?
Itīs orginal matching numbers car with 400 (335 hp), TH400 and for the moment i cant remember which rear axle.

What type do you use?
10W40?
20W50?
High Zinc?

Best Regards
Marcus
Factory recommended 20W oil above freezing or 10W-30 as an alternate. Automatic trans uses Dextron fluid. Manual trans - SAE80 weight. Rear axle - SAE80 weight, but requires additive #1050081 .

But, asking what oil is a loaded question. If the engine is stock, ie flat tappet camshaft, you need an oil with Zinc such as Brad Penn or Joe Gibbs or you can get a zinc additive. Some use the synthetic blends and say they are OK, but I have never used them.

Oil weight depends on outside temps, and engine wear as well. I would use 10W-30 as a minimum and might even opt for 10W-40 if it has miles on it and for hotter summer weather. 20W-50 is too thick unless you have opened up the clearances on your rod & main bearings - ala racing engine, and have the oil pump and aftermarket pump shaft to turn the thicker oil.
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post #3 of 3 (permalink) Old 06-21-2018, 12:56 PM
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What Jim said! I run 10/30 or 15/40 Rotella in all my old cars...not problems in many years and miles.
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  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, Lemans & GTO Complete Engine Compartment Discussion

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