hicrop10 Posted 10 hours ago Share Posted 10 hours ago Before I start up my truck,I want to change all the oils.It has a Cummins DT335 engine I’m thinking 30 weight.Power steering get power steering fluid,transmission 30 weight,rears all get 90weight.Whats everyone throughts. Quote Link to comment https://www.bigmacktrucks.com/topic/76437-what-weight-oil-to-use/ Share on other sites More sharing options...
davehummell Posted 10 hours ago Share Posted 10 hours ago How about series three 15-40 I run it in my old Mack the 31 and 32 fords and both tractors more useable in cooler temps. Back in 1973 I was in Caterpillar engine school, and we had a course on oils I asked about multigrade oils and the teacher had a little fit over me asking back then 30 w. in the summer and 10w. in the winter times have changed and 50w. in the trans anymore I think it was in the late sixty's dodge changed to autotrans fluid in their standard three speed trans I know for certain. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/76437-what-weight-oil-to-use/#findComment-591894 Share on other sites More sharing options...
Geoff Weeks Posted 9 hours ago Share Posted 9 hours ago As far as Power steering, it depends, on what gear you have. Sheppard takes 10-40 motor oil as per Sheppard. 15w-40 has been the oil of choice until recent engines. Trans depends on what transmission. Look to the manuals, for the last word. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/76437-what-weight-oil-to-use/#findComment-591897 Share on other sites More sharing options...
hicrop10 Posted 9 hours ago Author Share Posted 9 hours ago My transmission is a TR130. Quote Link to comment https://www.bigmacktrucks.com/topic/76437-what-weight-oil-to-use/#findComment-591903 Share on other sites More sharing options...
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