Lowest Viscosity Oil?

What is lowest viscosity oil that will protect my v8 Magnum engine in my 99' Ram 1500?Lowest Viscosity Oil?
The answer is written right in the owners manual. 5w30.Lowest Viscosity Oil?
The dealership I work for (in the winter0 puts 5w30 in older vehicles such as your ram, and 5w20 in the brand new cars.
I would only use Mobil One synthetic with the 0W-40 designation. It protects all moving parts at extreme temperatures and will keep the inside of your engine as clean as showroom.
40
Mobil 1 fully synthetic oil is zero viscosity
Check with the dealership or a local mechanic you trust.





Be sure you want to go there.....could be a big expensive mistake.





I would'nt trust just anone with my ride.