Why I add 12% (one gallon) of gear lube at every oil change...
08-13-2017, (Subject: Why I add 12% (one gallon) of gear lube at every oil change... ) 
Post: #12
RE: Why I add 12% (one gallon) of gear lube at every oil change...
i know a friend of mine has a 2250 isx and cummins recommendation is 10w30. Now all the 871 engines Cummins specifically says not to use 10w30. So it depends on the model but I would run 15w40 in them all. Just my opinion.
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RE: Why I add 12% (one gallon) of gear lube at every oil change... - Nilao - 08-13-2017



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