Cummins Premium blue,,regular oil,,
over 900,000 kilometers in my 93,,not a single engine problem ever,,nothing,,nadda,,
and this thing worked hard everyday,,towing or pushing snow,,,when i sold it,,it was still going strong,,
Using Cummins oil in my 97 3500 4 X 4,,only about 200,000 km,,no problems.
I guess the regular oils aren`t that bad after all,,if you buy a good brand,,no the stuff you buy for . 99 a quart when you do your groceries...
Syntetics do have some advantages for sure,,i just don`t think my truck needs it,,
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blacked out,96 3500,black,ext cab,KMC Slam,chrome aluminum wheels,continuous wheel balancers,Diesel Dynamics fuel plate and AFC kit,16cm housing,Dunnrite torque converter,Trans-go diesel shift kit,K&N filter,60 gallon transfer tank,Rld topper,