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Old 10-22-2019, 06:28 PM   #1
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CAT engine oil

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.
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Old 10-22-2019, 07:52 PM   #2
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https://caterpillar.scene7.com/is/co...llar/C10419422
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Old 10-22-2019, 08:34 PM   #3
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Quote:
Originally Posted by expedition1 View Post
...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.
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Old 10-22-2019, 09:29 PM   #4
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Cat built it. I go by their recommendations. I also use Cat Filters.
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Old 10-23-2019, 06:56 AM   #5
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Quote:
Originally Posted by Mark- View Post
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.
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Old 10-23-2019, 08:50 AM   #6
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The full synthetic in 5w-40 is Cat's recommendation. The 15w-40 is for non-synthetic oil.
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Old 10-23-2019, 09:00 AM   #7
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I use 5-40 full syn in my CAT. Seems to run like a top. Blackstone analysis indicates it's perfect.
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Old 10-23-2019, 10:09 PM   #8
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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.

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