Assuming I can get 500 miles on it without it coming back apart ...
Open to anything from 0w-20 to a 5w-40. Very worn out cylinder bores and a lot of piston slap. Previously full of sludge and crusty sludge from lack of maintenance and a severe overheat. New timing chains and tensioners / guides.
Engine either has 240,000 or 135,000 miles on it. Based on the condition of the guide arms and tensioner arms, I'm inclined to think maybe it's at 135k miles. It does get run hard. I'm not afraid (or wasn't before) to have my foot firmly planted on the floor towing a trailer up a hill at >4000 RPM for minutes on end.
Mostly looking for something that will work for the crappy cylinder walls. Similar to how the old pennzoil conventional yellow bottle had a lot of molybdenum and quieted down slappy old Jeep 4.0s.
Open to anything from 0w-20 to a 5w-40. Very worn out cylinder bores and a lot of piston slap. Previously full of sludge and crusty sludge from lack of maintenance and a severe overheat. New timing chains and tensioners / guides.
Engine either has 240,000 or 135,000 miles on it. Based on the condition of the guide arms and tensioner arms, I'm inclined to think maybe it's at 135k miles. It does get run hard. I'm not afraid (or wasn't before) to have my foot firmly planted on the floor towing a trailer up a hill at >4000 RPM for minutes on end.
Mostly looking for something that will work for the crappy cylinder walls. Similar to how the old pennzoil conventional yellow bottle had a lot of molybdenum and quieted down slappy old Jeep 4.0s.