5w30 or 5w20

[sammy]

Ok brand X synthetic exact numbers are
5w20 visc at 100C 9.0
5w30 11.9
10w30 11.4
10w40 15.1

Obviously whatever the second number is you are going to have a similar visc at operating temp. Point being... There is a large difference in viscosity and it makes a large difference in your engine. Your larger number will protect you on long trip or when hauling, but just like anything it comes at a price. Your oil will be 3 plus points less viscous. So it is a good idea to think about it before anyone increases flow restriction by 33%. Less protection at start up, probably up to 2 mpg less, less of a flo to combat sludge, etc. Maybe it will work fine in this application, but it is not working in the hemi population. yes, some 4 gen Rams with Hemi are doing fine with 5w30, but MANY are developing ticks. So at least consider both sides, I believe that is what the OP is asking.

 

[DodgeRamz2007]

Originally Posted By: sammy
Ok brand X synthetic exact numbers are
5w20 visc at 100C 9.0
5w30 11.9
10w30 11.4
10w40 15.1

Obviously whatever the second number is you are going to have a similar visc at operating temp. Point being... There is a large difference in viscosity and it makes a large difference in your engine. Your larger number will protect you on long trip or when hauling, but just like anything it comes at a price. Your oil will be 3 plus points less viscous. So it is a good idea to think about it before anyone increases flow restriction by 33%. Less protection at start up, probably up to 2 mpg less, less of a flo to combat sludge, etc. Maybe it will work fine in this application, but it is not working in the hemi population. yes, some 4 gen Rams with Hemi are doing fine with 5w30, but MANY are developing ticks. So at least consider both sides, I believe that is what the OP is asking.


I was asking for this type of info. Someone with a Ram experiencing this or has made the decision on 5w20 or 5w30. At the end of the day, I don't think running a 5w20 will hurt my Ram. Just weird that the OM was changed back to 5w30. This Ram drives about 10-12 miles a day. So I am guessing the 5w20 will still provide the best protection?

 

[VNTS]

The 4.7 was speced for 10W-30 when released in 99. I have an 02 in my Jeep and run 0w-30, 5w-30 and 10w-30 flavors.

They never made any changes to the 4.7 save the tone rings on the flywheels in 02 for the NGC to 32 teeth. They redesigned for the HO in 02 and in 08 the 16 plg version.

I would run a 30 weight oil and keep the changeds resonable. Also change your PCV valve and the two plastic restrictors at the back of the manifold.

These engines do not sludge unless neglected. on a couple of the jeep forums I am on there are many over 200K runnign strong. Some overheat them because of the radiaotrs being neglected or idiots puttign the wrong antifreeze in them.

 

[DodgeRamz2007]

Originally Posted By: VNTS
The 4.7 was speced for 10W-30 when released in 99. I have an 02 in my Jeep and run 0w-30, 5w-30 and 10w-30 flavors.

They never made any changes to the 4.7 save the tone rings on the flywheels in 02 for the NGC to 32 teeth. They redesigned for the HO in 02 and in 08 the 16 plg version.

I would run a 30 weight oil and keep the changeds resonable. Also change your PCV valve and the two plastic restrictors at the back of the manifold.

These engines do not sludge unless neglected. on a couple of the jeep forums I am on there are many over 200K runnign strong. Some overheat them because of the radiaotrs being neglected or idiots puttign the wrong antifreeze in them.


Thanks for the information. This was helpful.

 

[440Magnum]

Originally Posted By: VNTS

These engines do not sludge unless neglected. on a couple of the jeep forums I am on there are many over 200K runnign strong. Some overheat them because of the radiaotrs being neglected or idiots puttign the wrong antifreeze in them.


The list of "common problems" for the 4.7 is very short indeed- it basically has no problems widespread enough to raise it to the level of even calling it a 'common' problem. Even when people work it *really*

In fact the only problem that I've read about frequently enough to make me think about watching for it is water pump impellers spinning on the shaft causing overheating. There are some reports of the cam finger hydraulic tensioners cracking out of the head casting, but that's been on the first-gen head more than the dual-plug head I have.