5w-30 but during winter I would use 5w-20 as it's a lighter weight easier for motor to run in colder weather than switch back to 5w-30 in summer that's what I do worked wonders
I wanted to know what type of oil works best with 99 ram 1500 quad
Use 5W-30 unless if burns oil. Try 10W-40 if oil consumption is excessive.
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