which oil has the better cold start capability?

[97tbird]

I was wondering which of the following oils would provide a better cold-start?

Pennzoil LL 15/40 compared with:
Delo400 15/40

 

[Jelly]

On paper, Delo 400 by a slight margin, but it was 8°F here earlier and my 4.3L Chevy started right up with no problems...it's running Long-Life 15w-40.

[ January 30, 2004, 11:40 PM: Message edited by: Jelly ]

 

[heyjay]

It all depends on what you're running.

The Esso Lubricants Products Handbook suggests a cutoff of -4 F running a 15W-40. It's not safe to use in temps colder than that.

OEM's have their own specs. Cummins will usually suggest a cutoff of +5 to +10 F on 15W-40. Cat doesn't want a 15W-40 used colder than +15 F.

As a group, conventional 15W-40, I have not seen a big enough difference in MRV values to even suggest that one is any better than another for "cold temp" use.

Jerry