Oil choice is bassed on climate and temperatures .. cold as hell in Canadia ,,, What are the temp ranges in your upside down neck of the world ....Have 80+ when cool, still 74 when hot at like 1200rpm. Ronnie's engine is virtually the same so I am going to follow his advice. He runs 0/30 synthetic
I use the 15-50 mobil 1 in the hell hole of hatties Florida to cover the extreme heat and the cold days is covered by the 15 weight ... compare temp climate ranges of oils and what choices are the best ...
I lose way less oil between oil changes than I did with the 0-40 recommended factor recommended oil and didnt notice any difference in oip pressure ..