Re: [MV] M715 - What lube to put in trany and xfer case ?

ET Lance-Gómez (
Tue, 21 Jul 1998 19:46:23 -0500

I use 80-90W gear oil in my M715. The lube spec calls for 80W in winter
and 90W in summer, so the multi-vis works fine for year-round. I don't see
the sense in putting expensive gear oil in a truck that will most likely
have some amount of leaks. Also, at $9/2gal on sale, gear oil is cheap.

As to getting it in, this is easy in this truck with the high ground
clearance. I usually use a quart bottle of gear oil with the squirt top.
Because you can't squirt from the bottle into the filler holes easily, I
just attach an appropriate length of hose (preferably clear) and squeeze on
the bottle until it runs out the fill hole.

George Schmidt wrote:

> I'm planing to change the fluids in my recently acquired M715 but don't
> know what to put back into the transmission and transfer case. Engine
> oil ?, gear oil ? what weight ? and how much of the stuff do I need ?
> Also, since this is an occasional use vehicle, I can afford to buy a
> good lube, maybe synthetic. Any suggestions ?
> And finally, I can see that gravity will help get the old oil out, but
> how do I get the new lubricate in ? My 'shop' is pretty primitive and
> I'll be working on the ground under the truck.

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