I've got a zero turn mower with a Kawasaki 25HP FH721V vertical shaft 4 cycle air cooled engine.
Kawi basically recommends 30 weight or 10W30. The mechanics tell me that they motors do best on 30 weight. So far I've only got 8 hours on the unit but I have changed the oil 3 times with 30HD (Havoline).
1) How many hours should I put on this motor before switching to synthetic
2) Which one of the following would you use. I have a pretty good supply of all of them
- Delvac/T-SUV 5W40
- Castrol GC 0W30
- Mobil 1 10W30 (older Super Syn formula)
or should I just stick with
- Havoline 30HD or Trop Artic 10W30
Decisions, decision! I'm not trying to extend my OCI (at 2 quarts with the filter the money isn't an issue) but rather make sure the motor is well protected.