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Wow they had xw20 back then......
does yours use any oil in a season??
Yeh, when Mobil One first came out back in the 70's, it was 5w20, and Mobil said it was the equivalent of 10w40 regular oil.
I have always used M1 in my 2000 model lawnmower which has the 5.5 hp Honda OHC engine. I use it about 60 to 65 hours a year, and change oil once a year. It has never used any oil between changes. I have an hour meter on it, so I know how much it is used. I use it all winter, cleaning up leaves, and changing the oil in March. This year, so far, it has 46 hours on the last change, and it is still right on the full mark.
I use 5w30 usually, but last year I used a can of 0w30 M1 just to see if it would use any, and it didn't.