CK-4

[altaylar]

Welcome to BITOG!

I don’t think you need a 20W50 - and I mean that with all sincerity. What does the engine specify? If you want to go up a grade from that spec, no worries, but jumping all the way up to a 20W50 isn’t necessary and won’t give you better life or “better protection”.

I would worry more about the oil quality, what specs it meets, than the HTHS alone, as long as the HTHS is sufficient.

This is such a quality answer.

Welcoming, helpful, and informative without that "the higher the hths the better the protrction" belief.
Thanks @Astro14 , really nice to see members like yourself here

 

[altaylar]

Wow thank you all for the responses. I probably should've added that I'm running an oil bypass kit on my truck as well which has dropped oil pressure a little bit. And by little bit I'm talking about 1 psi. I was thinking a thicker oil would help keep pressure in a good sweet spot.

The only reason I'm even looking into HTHS numbers at all is because of this forum lol and I mean that with the upmost respect. So I figured the higher the HTHS number the better. I plan to keep this truck until I die lol.

One thing that I've been surprised by is how I can find gas engine oils that have HTHS numbers into the 5+ range but can't find a ck-4 spec oil in that range unless I go to multi grade 50 weight and even then it's hard to find Diesel oil in that grade, at least ones that share there HTHS numbers and other typical specs you would expect to find on a data sheet.

I don't think 1 psi difference really matter that much, i would not worry about that. See below:

Viscosity @ 100C not HTHS determines oil pressure at operating temperature.
Shop for a higher KV100C if you’re worried about oil pressure, or drop down a gear instead.
Gale Banks runs 15w40 on the dyno in L5Ps producing over 800 hp.
Petro Canada has two choices in Duron 20w50. They work great in motorcycles and lawn tractors and maybe in an old Detroit two stroke.

This is exactly on point. Hths is great, and there sre studies showing specifying an oil make more sense using hths rather than viscosity grades. But for purely pressure point of view, viscosity matters more. But again, probably a thicker oil in your grade would more than compensate for 1psi difference
(And this is also to say that depending on the oul you choose within the recommended spec, the pressure should deviate more than 1 psi anyways)

 

[JavierH19]

Yep, comes with basic Delvac - even Delvac 1 ESP 5W-40 is an upgrade …

These are factory filled with delvac 1300? That's surprising.

 

[fantastic]

These are factory filled with delvac 1300? That's surprising.

Emissions friendly, Synthetic Blend, You already know Mobil+GM= & cheap cost of 1300. Probably has a good chance of being FF.

 

[altaylar]

Emissions friendly, Synthetic Blend, You already know Mobil+GM= & cheap cost of 1300. Probably has a good chance of being FF.

I think Mobil 1 has been doing a great job working with manufacturers. GM, Porsche, Mercedes Benz, Bentley...
Not hard to imagine that they should have amazing real world data in their arsenal that would help them make better formulations faster.

 

[OilzGood]

I just wanna say again thanks for everyone who has replied to my thread. There's a lot of knowledge on BITOG and I'm definitely in my infancy learning it. Ended up reaching out to Castrol on there Vectron 15w40 ck-4 (I always forget they offer Diesel oil) and they stated it has an HTHS of 4.3 just fyi if anybody is wondering.

Has anybody complied a list of oils with HTHS ratings like they have with additives packs?

I totally understand what you guys are saying as far as it being more important to see the whole chemistry of an oil instead of just being zoomed in on one particular aspect and looking for the highest number of that one thing. I guess I really shouldn't pay too much attention to the HTHS number because any popular name brand oil will meet it.

 

[fantastic]

Has anybody complied a list of oils with HTHS ratings like they have with additives packs?

Not that I'm aware of but I could certainly add a column on the additive list if anyone wants to share w/me the PDF of a brands HTHS rating. Great idea!

 

[johnmyster]

Delo ADF 600 15w-40: high HTHS and DPF friendly.

Zero lubrication worries with an L5p.