Best Oil Model A Ford?

Messages
50
Location
Minnesota
There seems be little consensus on this--Detergent or non detergent straight weight or? The Model A is driven only in warm weather and around town only. I am currently using a detergent 20-50 ( Castrol GTX) Would anything else be better? thanks JOhn
 
Messages
47,627
Location
Duvall WA - Pacific NW USA
Does the 20W-50 leak? If not go with it. I think the text book answer is not: Find out kind of oil they used in 192X [Big Grin] - I don't think that would be pretty. Idealy on paper a straight SAE 30 or 40 non-detergent oil. My brother runs straight 30 weight in his Model A, but it is a detergent oil.
 

Ed

Messages
135
Location
Southern California
any motor oil you can buy today is lightyears ahead of what was available when the model A was designed.A lot of people believe and insist that only non-detergent oil is suitable for these old engines. That is pure urban legend. Castrol 20w50 is probably ideal.
 
Messages
508
Location
milwaukee
I've heard that if you run a detergent oil it is more likely to leak oil and/or burn oil. Isn't that due to the high probability of sludge and old gaskets. Would it be a good idea to clean things up with Auto-RX, replace worn seals and then run a detergent oil?
 
Messages
43,651
Location
'Stralia
Aussie company Penrite make a classic engine oil. I'd post a link to their site, but I think it's against the rules, so suggest that you look up Penrite oils on the search engine of your choice.
 
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