I have a Ford Model A with a 90 year old re-manufactured engine that has a low pressure oil system, flat tappets, and babbitt bearings. I want to add Zinc and Phosphorus.
I'm looking at three possibilities - ZDDPplus (about $10) , Riselone 3X Engine Oil Supplement (about $5), or STP Engine Oil Treatment(about $3). All three claim to contain ZDDP.
Where can I find out how much each contains and how much do I want in a five quart crankcase?
I'm looking at three possibilities - ZDDPplus (about $10) , Riselone 3X Engine Oil Supplement (about $5), or STP Engine Oil Treatment(about $3). All three claim to contain ZDDP.
Where can I find out how much each contains and how much do I want in a five quart crankcase?