Mobil 1 Truck & SUV 5W40 or Royal Purple

[rum4by5]

Do the oil bypass filters actually keep the oil in that good of condition. I thought the reason the oil is changed was because the viscosity. Once the oil is heated wouldn't the viscosity of it be broken down?

 

[DaveBen]

Oil breaks down with temperature in use. It also breaks down with shearing of the oil (see www.bobistheoilguy.com) and other things like dilution. See bobistheoilguy for more information. RP is good stuff.

Dave

 

[Mobeydick]

Mobil 1 Truck SUV to the best of my knowledge has not been discontinued! Seen 8-5 quart bottles on the Shelf at Wally World this evening, (first Mobil 1 Truck Suv oil I’ve seen in 3 months) BUT The specs have been changed to something like GF4 or something like that. What made me notice is it states that it is for Gasoline motors only!! Also it was a 5W-30. The Mobil 1 Truck Suv Oil I have on my shelf in the garage is 5W-40!!

 

[F350DRW1]

I ran the Royal purple for one change. Truck ran well, but I just didnt see where it was worth the additional $50.00 over my usual change of Rotella syn / dino mixture.

 

[Blane]

i went to meijer to get some oil (didnt get any cause they didnt have any filters for my truck anyway lol) and i have been a fan of mobil oil, used modil 1 in both my mustangs. there was a mobil 1 truck and suv delvac 1300 15w40. in a 2.5 gal jug. good stuff? i now nothing about diesel engines.