6.4 HD Oil Question

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HEMIMANN

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Minneapolis, MN
Ram Year
2017 2500 Laramie Crew Cab
Engine
6.4L HEMI
I was wrong, now that I looked at the blackstone thread, it took only the first 3 pages to have over 9 uoa's of 5w30 still in 5w30 operating viscosity. This was tons of fun, peace

Including mine. But I guess I'm an ignorant know-nothing.
 

EastWestHemi

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New England
Ram Year
2016 2500
Engine
6.4 w/4.10s
I’ve used all types of oil. PUP 0w40, Mobil delvac 5w40, redline 5w30, Castrol 0w40 and am now on Mobil 1 FS 0w40. The previous oil change with castrol at 30% oil life left was normally around 49 psi, getting into the throttle 52ish psi. Once I put the Mobil FS in I’m 53 cruising psi and 57 psi when revving. I don’t remember castrol oil psi when fresh.

I think I read that castrol was also a thinner 0w40.

I’ve had best oil pressure with the Mobil delvac esp 5w40 and now the Mobil 1 FS.

The redline 5w30 was expensive and I didn’t hear anything that made me think the engine was quieter because of all the moly. I’d rather change my oil twice with Mobil or castrol and for less money than use it.

I don’t care much to pay $50+ For a six pack of PUP 0w40 when castrol and Mobil can be had for low $20s for five quarts. Valvoline recently paid the money to meet the spec and pretty sure that they just used their euro 0w40 oil. My 2cents.

That 15w40 would be fine. CK-4 Mobil delvac is gas rated. I have it in multiple tractors and a VW 2.5l five banger commuter car right now. change it for some 0w40 next time, whatever is on sale at Walmart 0w40. I also use the fram toughguard filter. A quality 0w40 and filter will cost you $40 from Walmart, the PUP change will be $70 Amazon, and redline is a $100 oil change— eliteracefab has redline on sale from time to time but still high $40s for a gallon. 15w40 is a $30 oil change, not enough savings to justify.
 
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