While we are on the subject, is everyone using 5w-20? Is anyone running a different weight oil in their Hemi? I would assume Chrsyler would prefer 5w-20 to make the motor more efficient, am I wrong and why? Just been pondering that....
I've been using 0W30 synthetic for the past 30,000 miles (about 50,000 kms) and have absolutely no issues. MDS works fine. Mileage is about the same (or negligent increase....not enough to notice).
I changed over once my car hit 70,000 miles (105,000 kms).
Over in Europe, the manual for our cars calls for 5W30, since they can't really get the 5W20. I figured if a "30" weight oil is fine in Europe, it's fine here too, and it is.
BTW, 5W20 has become more and more popular due to car manufacturers striving to meet the stricter C.A.F.E. standards for their entire production. Infact, when Ford began recommending 5W20 in their cars, it was for the same car and engine that it had been recommending 5W30 for the previous model year. Same engine, same car, same specs....different weight oil. The only difference was that the year the new 5W20 became recommended was the year the stricter C.A.F.E. standards took effect.
5W20 will be ok if you don't plan on keeping your car past 100,000 miles (160,000 kms) which their research points to as being the majority of car owners. Past that point, they figure you won't care if the engine was been properly lubrciated/protected or not since you're getting rid of the car. If you're like me and plan on keeping it for a long long time, then switch to 5W30 synthetic (or 0W30 synthetic year round if you're in Canada like me) for the extra protection.