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Oil weight for D6C

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1 month 2 weeks ago #230205 by Xtremist
Oil weight for D6C was created by Xtremist
Hey guys,

I have a 1974 D6C with a powershift, and I was wondering if I can run a multigrade oil safely in both the engine (3306) and the transmission ?  Something like a 10w30 so that I could use it in the winter the odd time if needed without having to swap out oils but heavy enough for summer use...  Thoughts or experiences ?

Thanks for the help

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1 month 2 weeks ago #230218 by kittylover123
Replied by kittylover123 on topic Oil weight for D6C
you don't say where you're located Xtremist....or the temperatures you're dealing with roughly...

-my D6c, i use 5w30 in everything (standard trans)
-located in Northern Canada, so i can run in the summer and optional winter use as well (-40 to +40C)
-i don't operate at either extreme...i get lazy...

Caterpillar D6C 99j

Tax me, I'm Canadian:canada:

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1 month 4 days ago #230564 by Xtremist
Replied by Xtremist on topic Oil weight for D6C
Northern Canada you say, where abouts ?  Im in central Alberta so we are lookng at the same rough temps id say....  I ended up ordering 10/30 for it....mine is a powershift.  Thanks for the reply !

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1 month 4 days ago #230571 by kittylover123
Replied by kittylover123 on topic Oil weight for D6C
Pouce Coupe BC (Dawson Creek)

yes our weather is very similar... 5W30, 10W30 and you're golden
i forgot, my finals are 80-90 gear oil

Caterpillar D6C 99j

Tax me, I'm Canadian:canada:

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1 month 4 days ago #230581 by Xtremist
Replied by Xtremist on topic Oil weight for D6C
yep went with 80/90 in the finals as well

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1 month 4 days ago #230585 by trainzkid88
Replied by trainzkid88 on topic Oil weight for D6C
that is exactly what multigrade oils were developed for so you dont have to change them just becuase of the weather.
now if your some where that gets real extreme swings of temp than a suitable multigrade may not be available. ask your chosen oil company for a reconmendation they know there products and can advise you.

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3 weeks 5 days ago #230785 by Xtremist
Replied by Xtremist on topic Oil weight for D6C
yep absolutely i was just more wondering if it was safe to run it in a machine that was originally supposed to have a straight grade oil in it.

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3 weeks 5 days ago #230816 by trainzkid88
Replied by trainzkid88 on topic Oil weight for D6C
perfectly fine. multi grades are often the better choice as they give a more consistent oil thickness and thus more consistent lubrication. they are also cheaper.
The following user(s) said Thank You: Xtremist

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3 weeks 5 days ago #230818 by D4Jim
Replied by D4Jim on topic Oil weight for D6C
As trainzkid88 says multi-grade oil is nearly always better to use.  It gives the best of both worlds as it behaves like a lightweight oil at low temperatures (starting) and behaves as a heavyweight oil at higher temperatures (operating).  For example 10W-40 viscosity is similar to 10 weight at 0 degrees F and has the equivalent viscosity of a 40 weight oil at 212 degrees F.  
Another consideration is the API service rating.  Many countries use the API rating and some use their own rating system.  Never use an API rated oil below that specified for the particular requirement.

ACMOC Member 22 years
D47U 1950
Cat 112 1949
Cat 40 Scraper
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3 weeks 4 days ago #230860 by trainzkid88
Replied by trainzkid88 on topic Oil weight for D6C
note some engines cant use modern high detergent oils. and must use low or non detergent oil. hence why you get a recommendation from the chosen oil company as they will have this info. a point to remember with old cat gear is they have bronze gears and bushes in the finals and trans and cant use zinc fortified oil in those areas. the zinc compound can attack the bronze parts

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