Trombo and Morgul,, I really can't go past STP or Moreys (Similar) The test of STP was to drain the oil from the sump of a Jaguar, add STP only, and run the Jag for a few fast laps around the track. The engine was pulled down and showed absolutely no sign of wear. I used it for many years. In a Triumph I owned, it was blowing smoke, had lost compression, used oil and leaked oil. STP regained compression, stopped the smoke, stopped the leak and oil consumption was nil. ! I will add some on my next oil change.