Oil - again

M

Mad Mac

Senior Member
I have just bought some Havoline 20-W50 oil for my Model A. I bought it because it says "better wear protection for older engines". But then I noticed it also says API SJ. I recall reading somewhere that it should be API SC for Model As? I know some guys think its not important but I want to get it right if possible.
 
Good Evening...Model A Engines should have SN engine oil according to a recent article in Model A Times...Give it a read and then decide...Ernie in Arizona
 
The 20-W50 oil will work just fine in your Model A. This is way better stuff than what was available when your Model A was new.


Chris W.
 
Mad Mac said:
I have just bought some Havoline 20-W50 oil for my Model A. I bought it because it says "better wear protection for older engines". But then I noticed it also says API SJ. I recall reading somewhere that it should be API SC for Model As? I know some guys think its not important but I want to get it right if possible.
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SJ is more than good for an A. SC oil will be hard to find and expensive if you do.
 
My engine rebuilder - with a national reputation - suggested to use Valvoline VR1 Racing oil - 10W-30, with ZDDP Plus additive to restore zinc and phosphorus levels to the oil to prevent premature wear to the cam and tappets. It made sense to me and really doesn’t cost more, so I follow the recommendations. Amazon sells both products.

Jim
 
Zinc is not needed after break in on the A motor, zinc was added later due to higher engine speeds requiring stiffer valve springs to prevent valve float.
 
Conaway2 said:
My engine rebuilder - with a national reputation - suggested to use Valvoline VR1 Racing oil - 10W-30, with ZDDP Plus additive to restore zinc and phosphorus levels to the oil to prevent premature wear to the cam and tappets. It made sense to me and really doesn’t cost more, so I follow the recommendations. Amazon sells both products.

Jim
Click to expand...

Valvoline VR1 Racing Oil already has high amounts of Zinc and Phosphorus. Adding ZDDP + is not needed and a waste of money.
 
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