REStracTORATION
Member
I agree with you there 100%We used to put straight 30 in the old Leylands. If you put detergent oil in they would burn a quart a day, and show low oil pressure.
These old tractors we do we use a 20/50 15/40 with no detergents they leak oil for fun does a rope seal with detergent oil.
The cheapest oil possible keep it changed regulary wont be any other in the old lasses.
New stuff is a different kettle of fish the oil grade is extremely important.