Mobil 1 Delvac ESP 5w40 vs Valvoline Premium Blue Extreme 5w40 opinions

[6.7 CTD]

I’ve read the PDS of both oils and I currently am using VPBE 5w40 in a 2024 Ram 6.7 Cummins. I also noted VPBE to have a slightly higher hths but have always been a Mobil 1 fan. I know the Cummins isn’t picky with oil but I just wanted some personal opinions from real world users of either/both.

 

[JavierH19]

0.2 hths isn't a huge difference and those two oils are better than what most cummins owners use (basic but still good 15w-40 like t3, t4, or delvac 1300 ect...) so you can't go wrong. The others can chime in but it'd be best to ask on the ram forum.

 

[6.7 CTD]

Thanks, can’t use 15w40 on the 19+ Cummins though. They spec 10w30 and 5w40 now. Didn’t think you were necessarily insinuating that either, so you may be aware.

 

[JavierH19]

Thanks, can’t use 15w40 on the 19+ Cummins though. They spec 10w30 and 5w40 now. Didn’t think you were necessarily insinuating that either, so you may be aware.

There's zero issue with running 15W-40 in these 2019+ trucks. It has been discussed over and over on here. On ram forums I've seen owners swear by delvac extreme 15w-40. It's pretty stout.

 

[6.7 CTD]

Not going to go down that rabbit hole, after I’ve experienced ram customer service first hand, I’d prefer to just run a 5w40 year round as I live in a fairly cold winter climate. I’ve been to the dealer multiple times already, for warranty work, and they probably hate me.

 

[fantastic]

Either & Mobil has rebates on it once in a while. Not sure on the rebates for PB as I've never bought it but I can promise it's darn good oil as well.

 

[6.7 CTD]

I got vpbe for around 25/gal, on sale, at Napa previously and I just picked up some delvac for under 23/gal today at WM. The engine is still breaking in, so the uoa’s I’m sending likely won’t show much difference between the two oils. Just like to hear differing opinions; thanks guys.

 

[OLEJOE]

I got vpbe for around 25/gal, on sale, at Napa previously and I just picked up some delvac for under 23/gal today at WM. The engine is still breaking in, so the uoa’s I’m sending likely won’t show much difference between the two oils. Just like to hear differing opinions; thanks guys.

I’m interested in this possibility too. I have always been a Mobil fan and have wondered about this. Anxious to see what you find out.
As far as running a 15-40, there’s a spreadsheet on another forum listing the lifter and cam failures. There is only one truck listed that was running 15-40 and it had the failure at 350,000 miles. But it was run commercially and probably didn’t have a lot of cold starts on it.

 

[LWood]

My 03 cummins is obviously quite a bit different than the newer Rams but what I can add to this discussion is that I have run both the VPBE and the Delvac 5w40 oils many many times.
What I have found in my engine is the Valvoline seems to thin out a bit faster than the Mobil. My engine will start to use oil with the VPBE over my 7k oil change,roughly a bit less than a quart whereas the Mobil does not.
I know, not very scientific but that's all I have to add. I've gone to either Delvac or TDT exclusively, both seem about the same in my engine and I purchase which ever I find cheaper.
Larry

 

[Bighorn2500]

I’ve ran them both in my 6.7L, never noticed any real difference. I’ve stuck with 5w40 year round for over ten years now.

Mobil 1 TDT/Delvac 1, VPBE, or T6 are all relatively similar. Use whatever you find a deal on, sale on, or a rebate on.

I typically run them 10k and UOA’s have come back in good shape with plenty of TBN left. Put more emphasis on the filters your using rather than the oil itself.

 

[kschachn]

I got vpbe for around 25/gal, on sale, at Napa previously and I just picked up some delvac for under 23/gal today at WM. The engine is still breaking in, so the uoa’s I’m sending likely won’t show much difference between the two oils. Just like to hear differing opinions; thanks guys.

A UOA wouldn’t show anything of substance between those two oils anyway, breaking in or not. You don’t determine relative oil quality through a $30 spectrographic analysis.

 

[6.7 CTD]

A UOA wouldn’t show anything of substance between those two oils anyway, breaking in or not. You don’t determine relative oil quality through a $30 spectrographic analysis.

So the TBN remaining is a worthless value? Decreased viscosity from fuel dilution? To me that is valuable information, and I would anticipate some differences regarding this. But the uoa wasn’t my question, please refer to title. Do you use either of these oils in your 6.7 Cummins? That’s the opinion I requested, thanks.

 

[kschachn]

Fuel dilution is agnostic to brand. TBN is somewhat useful but with today’s low sulfur fuels, it’s far less important than it used to be. Starting values are dictated by the specifications and license is the oil holds and depletion is not necessarily linear.

You were the one that said you were going to compare the two oils with the UOA. Not me. I only responded to what you said. My personal experiences, if I had them, would be irrelevant here.

 

[6.7 CTD]

Fuel dilution is agnostic to brand. TBN is somewhat useful but with today’s low sulfur fuels, it’s far less important than it used to be.

You were the one that said you were going to compare the two oils with the UOA. Not me. I only responded to what you said.

I never stated I was sending them to compare the oils. I stated “so the uoa’s I’m sending likely won’t show much difference between the two oils”. I send uoa’s regardless, not to compare different oils, and did so with the factory fill. I will post all of them and anticipate the TBN and viscosities will be different each time. I’ve read enough posts on here to see where this is going, straight down a rabbit hole. Please contribute something substantial to my request as oil analysis was not the topic, thanks.

 

[kschachn]

I never stated I was sending them to compare the oils. I stated “so the uoa’s I’m sending likely won’t show much difference between the two oils”. I send uoa’s regardless, not to compare different oils, and did so with the factory fill. I will post all of them and anticipate the TBN and viscosities will be different each time. I’ve read enough posts on here to see where this is going, straight down a rabbit hole. Please contribute something substantial to my request as oil analysis was not the topic, thanks.

As you noted, “difference between two oils”. Just keeping it real.

 

[6.7 CTD]

Ok back on topic, first time using the ignore feature

 

[johnmyster]

13 quarts of $10.22 a gallon Delo 400 5w-40 from the recent AAP haul just went into my 6.7.

HTHS 4.2, 15.4 cSt...seems high for 5w-40 but I'll take it.

 

[Dr_Dr3i]

^^^ So that's where my missing box went

I ordered 3 but only received 2, so AAP gave me a credit. That's excellent oil for $12/gal shipped.

 

[OLEJOE]

My 03 cummins is obviously quite a bit different than the newer Rams but what I can add to this discussion is that I have run both the VPBE and the Delvac 5w40 oils many many times.
What I have found in my engine is the Valvoline seems to thin out a bit faster than the Mobil. My engine will start to use oil with the VPBE over my 7k oil change,roughly a bit less than a quart whereas the Mobil does not.
I know, not very scientific but that's all I have to add. I've gone to either Delvac or TDT exclusively, both seem about the same in my engine and I purchase which ever I find cheaper.
Larry

I noticed in the UOA that I recently ran using the VPBE that it did drop viscosity from the advertised 15.3cst down to 13.6cst @ 100*C. I think the Mobil Delvac starts out around 13.8 cst. Would be interesting to see if it holds the viscosity better.

 

[carl2591]

^^^ So that's where my missing box went

I ordered 3 but only received 2, so AAP gave me a credit. That's excellent oil for $12/gal shipped.

what is AAP?? asking for friend..