DC Mulit displacement HEMI -5W20 oil

[TboneMan]

I have a friend who is considering replacing his older 5. 2L Ram 1500 pickup with a megacab 2500 with at 5. 7 hemi V8.



He tows a lot, but he can't justify a diesel as he only drives around 10k miles a year.



I know my wife's Charger R/T with the 5. 7 multidisplacement system requires 5W20 oil (I use Mobile 1).



I'm assuming the pickup truck version of the Hemi would use the same (since the MDS depends on the oil viscosity to work).



My thought is 5W20 seems a bit thin for hot summer towing.



Do the trucks have massive oil coolers? I'd worry about the long term effects of thin oil when running for extended periods of time at near max. engine capacity.



Any opinions?

 

[JacobsD]

My father has a 03 Hemi and we always put 15-40 in it. It does have an oil cooler, not sure of how big it is though.



I think that the hemi's are toilets though. In a truck atleast. Their definatly not a towing motor. If your buddy wanted a gasser to tow with, he should look for an older V10 truck, as they have gobs of torque.



The 5. 7 Hemi would make a sweet hot rod motor though. D/C does offer a carburated version in a crate motor Oo.

 

[TboneMan]

My father has a 03 Hemi and we always put 15-40 in it. It does have an oil cooler, not sure of how big it is though.



I think that the hemi's are toilets though. In a truck atleast. Their definatly not a towing motor. If your buddy wanted a gasser to tow with, he should look for an older V10 truck, as they have gobs of torque.



The 5. 7 Hemi would make a sweet hot rod motor though. D/C does offer a carburated version in a crate motor Oo.

I believe '06 was the first year for MDS hemi's in the trucks. As I understand it, 15w-40 would surely be detrimental to the MDS.



The Hemi has to be better than his 5. 2L. Besides, I want to still be able to wave at him as I go by when towing up a hill. If he got a new Cummins he'd be passing me.

 

[mberry]

Why not have him put a 4BT in it instead of getting a new truck with a gas motor? Unless, of course, he doesn't like his current truck anymore.

 

[WCPoe]

Lower weight oils for increased economy

TBone - I thought I read that the 5w-20 and 0w-20 oils were just developed for the purpose of CAFE fuel economy reasons. My wife's Honda Pilot specifies the 5w20 and I have always been skeptical about it. The Honda dealership tries to intimidate you into their 5w-20 for warranty coverage. I'm like you, towing would seem to stressful for those weight oils especially in the summer



There's some thoughts on the link below:



Technical Information About 5W-20 Motor Oil

 

[DJW]

For my part I'd use the oil weights recommended by the engine manufacturer and changed as the owner's manual states. As for Honda, I do not believe they have many high fuel using vehicles in this country, thus needing to comply with the CARB regulations. When draining oil plus oil filter in a Honda CR-V I had . 9 quart remain (reading engine oil capacity and refill amount) in the engine, (figure that one). Regarding Amsol information, if one had engine trouble after using an oil of the weight not specified by the manufacturer, I would suggest to leave the engine strictly alone, as if one drained the oil without a certified person qualified as a witness, I doubt very much if that would stand. (would you?) Someone giving instructions as quoted, is certainly misunderstanding a person's common knowledge. (then again I may be overly optimistic)(well, Hope springs Eternal) As regards the Fed. Mag. Moss Act, could be a Lifetime experience (sure not to be missed) could probably could get your name in the local newspaper. For myself, I'd take the manufacture's advice, and let them carry the Ball. (much better than dropping one of my own)