rw613 Posted May 22, 2009 Share Posted May 22, 2009 this is a little older then i know any thig about what grade of oil should i put in this thing Quote Link to comment https://www.bigmacktrucks.com/topic/9478-49-mack-gas-engine-question/ Share on other sites More sharing options...
Firemack Posted May 23, 2009 Share Posted May 23, 2009 RW613,I just answered this on another post, the best oil for older gas engines is Shell Rotella T SAE 40W, it is a high quaility oil and provides excellent protection for the older gas engine combustion compounds etc. .Firemack Quote Link to comment https://www.bigmacktrucks.com/topic/9478-49-mack-gas-engine-question/#findComment-35574 Share on other sites More sharing options...
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