SWZ Scag 36- specs calls for 20w50 engine oil in manual for the hydro. I checked 3 surrounding citys/towns and only finding 20w50 in Castrol. I read that mobil 1 synthetic might be better choice to keep hydro slightly cooler? Am I mislead on my thinking to try to find synthetic or go with the castrol? (I am not concerned on price diff)- I see they sell 'motorcycle mobil 1 online at about $75 for 6 quarts. I need 4 according to manual.. but with new filter maybe more.
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