My 50 hr service is due. Have all the filters now looking for the correct oil. Owners manual says 10-30 for -4 to +86, and 5-30 for -22 to +86. and 15-40 for +5 to 104 Here in upstate NY there are multiple days its below -4 so I figure to use 5-40 Syn to cover every base, and as it seems 5-30 seems to be near impossible to find. Also says CJ-4 which I know CK-4 is the new spec. I asked LS if the CK4 was okay, and they said yes, but when I asked them about oil and if 5-40 was okay, they said, "before you change to 5-40 you should run the recommended oil for one more cycle." I have no idea what that means. They don't recommend mineral or Syn, and 5-40 "should" be in their specs.
So my question is what others have used type (Syn or mineral) and weight wise at their 50 hr change in this engine. Not asking for brand war please, just what others have used with no issues.
So my question is what others have used type (Syn or mineral) and weight wise at their 50 hr change in this engine. Not asking for brand war please, just what others have used with no issues.