What is considered a respectable HTHS?

[ChrisD46]

M1 FS and ESP in 30 grades meet the performance requirements of SP (LSPI, TGDI chain wear).

M1 0W30 ESP with a 12 cSt and 3.5 HTHS would be on my short list of oils to try plus it meets SP and a host of Euro requirements .

 

[Brian123]

What's the story on that engine failure?


Yeah, a HTHS difference between 3.5 and 3.8 cP isn't huge, and HTHS of 3.5 cP is pretty good for a 5W-30 and would work fine for street driving, but as usual the higher HTHS will give a bit more protection headroom. The lower Noack is a bonus too.


It's one way to look at it, and you're basically looking at what you believe will be the highest oil temps and shooting for a KV100 that's going to keep the viscosity 10 cSt or higher. As the max oil temp goes up, then to maintain a safe level of viscosity the KV100 & HTHS viscosity will also need to go up. Running a xW-20 at say 250F max for instance would be running the MOFT on the ragged edge IMO with not much if any protection headroom.

There was no engine failure, I meant to say that after the 1st 5 hours I used Shell Rotella T5 10W-30, instead of saying break the engine in on, I said what I said. I was told by a member here to use Dino oil for at least the 1st 50 hours.

 

[Carlostrece]

It was heading there for 10-15 years or longer, IMO. I think we fully arrived at least 5 years ago.

I like my 97 Buick, but if I ever buy a newer car I'll look for an EV.

I don't prefer EV over an old school gas engine with port injection, roller cam, and timing chain; but I do prefer EV over a gas engine with direct injection or timing belt. Then consider the thin oils specified for newer gas cars and possible concerns with that. For me, I say "no thank you" to modern gas engines, IMO.

I should have also mentioned that I'm not fond of the weak spring pressure rings used in newer gas engines. That's more negative of newer cars, IMO.