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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.
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