Originally Posted by betmr
I don't know the recomendation of subarue for that engine, but let me say that I have no equipment that uses a heavy oil like 20W-50. That sounds pretty much like molassis to me. The heaviest oil we use is 30 weight, check your owner's manual for spec. I also don't know the age of this machine, but at the least, we change oil every year, no matter what the hours. Zero hours = seasonal oil change, otherwise change by manufacturer's recomendation.
I would have to agree because I use 20w-50 for chain bar oil, however straight
30w is just as thick (unless you were referring to 10w-30...)
Which that's what I run exclusively, 10w-30 synthetic.