Community Forums

expedition1 · 10-22-2019, 05:28 PM

Today I made a service appt and the service writer asked which oil I was using, when I told him 15-40 he told me I should be using 10-30 year round.

Opnions ? Has anyone else been told this or heard the same story?

I should mention it happens to be a C - 7 we are referring to.

Thanks.

KCFDCapt · 10-22-2019, 06:52 PM

https://caterpillar.scene7.com/is/co...llar/C10419422

Mark- · 10-22-2019, 07:34 PM

Quote:

Originally Posted by expedition1

...I told him 15-40 he told me I should be using 10-30 year round.

I always thought the temperature operated in defines the viscosity required.

KCFDCapt · 10-22-2019, 08:29 PM

Cat built it. I go by their recommendations. I also use Cat Filters.

CountryB · 10-23-2019, 05:56 AM

Quote:

Originally Posted by Mark-

I always thought the temperature operated in defines the viscosity required.

Why not run 5W-40?
It has a lower "minimum range" and the same "maximum range" as the 10-30 and 10-40 weights. So you get a wider operating range.

KCFDCapt · 10-23-2019, 07:50 AM

The full synthetic in 5w-40 is Cat's recommendation. The 15w-40 is for non-synthetic oil.

Revconguy · 10-23-2019, 08:00 AM

I use 5-40 full syn in my CAT. Seems to run like a top. Blackstone analysis indicates it's perfect.

2 Stroker · 10-23-2019, 09:09 PM

I use Amsoil 5w40 full syn. Quicker psi on a cold start and better on high heat. I send all my samples to Peterson Cat.
I run the same thing in my Ford PSD with a by-pass oil filter system.

2 stroker