Wow it runs great now.
Used Heavy Duty Oil Stabilizer in 40 year old diesel tractor. With a quality name brand engine oil. And wow it runs great now. Had a couple of slow seeping oil leaks not bad enough to fix, but now no need. Plan on using more Lucas products as I redo this tractor. Will post more as I go. Have always used Lucas in all my vehicles and I got 250,000 miles out of an old ford engine. Great stuff.