RAM 2500 Diesel lifter noise

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ramsare4real

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Hemi 5.7
Dude, it does not.
Dude, it matters. There's a reason hydraulic lifter engines always call for 0w, 5w or 10w oils. Cold flow characteristics are very important and a very different in 5w-40 synthetics vs 15w40 conventional. Flat tappet engines do not care, hydraulic lifter engines do.
At 40 C, there are no meaningful differences in "cold flow" (pumpability) between those, regardless of chemistry (conventional vs. synthetic).
The difference will be noticeable at the minimum temp each one is suitable for. A 0W-40 will be a LOT thicker at 0 F than a 15W-40 is at 40 F, yet is pumpable at - 35 F, while the latter is not.
Again, deposits formation has no bearing on viscosity characterization.

So, Dude, it does not matter.
 

Choupique

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Well, put 15w40 in yours. No money outta my wallet.

How often are you cranking your truck at 40*C? All the time? Probably never. Low idle, cold oil, it matters alot.
 

ramsare4real

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Well, put 15w40 in yours. No money outta my wallet.

How often are you cranking your truck at 40*C? All the time? Probably never. Low idle, cold oil, it matters alot.
"The difference will be noticeable at the minimum temp each one is suitable for."
 
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vjjack04

vjjack04

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Folks, I just wanted to provide an update regarding this topic. Sure thing, since I have been running the 5W-40 I now have zero noise in the lifter area. This truck is now very quiet with no noticeable issues of any kind. I almost have 30k miles on it. Hope all stays good. And I typically average 18-18.3 mpg in collective road and around town driving (related to my other thread). So, thanks guys for the information.
 
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