Synth or Mineral

[powermite]

I'm not convinced for the arguement of usuing synth.oil in an older design engine.I'm about to fit a new ZZ4 into my 85 Transam and GM recommend 10W30 SG.What is the SG bit?
Should I use a different oil for the running in period?
What would be the best oil thereafter,bearing in mind I will be changing the oil and filter every 3000miles

thanks

PM

 

[R Stuart]

SG is just an old prefix designation .

The ZZ4 crate motor does great with Pennzoil 10/30 and 10/40 even when occasionaly dragraced .

 

[buster]

I agree, Pennzoil or Chevron 10w-30/40.

 

[powermite]

Ive been usuing Torco MPZ Racing Oil 10-40 in my 305.Is it any good?
PM

 

[Robbie Alexander]

quote:

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Originally posted by powermite:
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Should I use a different oil for the running in period?
What would be the best oil thereafter,bearing in mind I will be changing the oil and filter every 3000miles

thanks

PM

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Me, unless some one can show me better.
I would use dino, and after several drains short OCI's
I'd wait til my wear came to a level field
Then I'd move to a Syn.
So, amybe 800mi-1K, 1.5K, then 2.5K, then 3.5K then maybe stay here 3.5-4K until ready to change. You can mix it up.
Some people believe change 500Miles. Others at the first 50-100 miles.
If you are concerned for your oil, you need to be concerned for the other fluids like Diff/Tranny

 

[powermite]

T56 6 speed Tranny will have Castrol DexIII
Rear axle has Amsol supplied by Baer Racing when i fitted their big brake kit.
thanks for all your advice
PM