Oil - again
 

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.

Re: Oil - again
 

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

Re: Oil - again
 

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.

Re: Oil - again
 

SJ is more than good for an A. SC oil will be hard to find and expensive if you do.

Re: Oil - again
 

Yes it was SN, not SJ and I think you are correct.
Thanks,
Mac

Re: Oil - again
 

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

Re: Oil - again
 

The cheap oil at Walmart is SN.

Re: Oil - again
 

Rotella T and don't worry about the little stuff.

Re: Oil - again
 

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.

Re: Oil - again
 

What Rotella do you use? T4?

Re: Oil - again
 

Re: Oil - again
 

If you do a search, tons of discussion on this. I consider this a good thread.
https://www.fordbarn.com/forum/showthread.php?t=159816


Too much Zinc is bad, more is not better.


I use Rotella T4, has some zinc, might help, but should do no harm unless too much zinc is added. I personally do not believe Zinc is required in the Model A motor..


Opinions vary.

Re: Oil - again
 

Rotella is the little stuff.