I got the traveler 5 gallon pail of 80W90 at tractor supply it’s what I used in my 151 about 1.5 gallons per diff I fill it till it pours out then wait a while until it drains good plug it The tool PS magazine tells you to make is good but I always thought that was the min level
I haven’t had any issues currently no leaks or overpressure check all your breathers to I replaced a bunch of mine
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