mixing 90 wt. and multi viscosity 85-140

tglass · Mar 3, 2006

Have been told the two cannot be mixed together. If they are, curdilling, or a non mix will happen, with bearing failure soon to happen. Anyone have any thoughts or better yet facts or publications on the subject?

Humbleto · Mar 4, 2006

I would expect that they would mix. Try mixing some yourself and see. Mix them in a clear container and see if you detect anything wrong. see if theyfeel different. I don't think I've ever heard of two oils not mixing.

Sully2 · Mar 4, 2006

</font><font color="blue" class="small">( Have been told the two cannot be mixed together. If they are, curdilling, or a non mix will happen, with bearing failure soon to happen. Anyone have any thoughts or better yet facts or publications on the subject?
)</font>
Personally..I wouldnt INTENTIONALLY mix them. What do you wind up with?? For a gear oil change Id just drain the "old" 90...and install the new stuff....I wouldnt worry about FLUSHING the old 90 out...but I sure wouldnt "pre-mix" the 2 into some sort of combo to install fresh.

EddieWalker · Mar 4, 2006

I did it today in my post hole digger gear box. One quart of 90wt and two quarts of 85-140wt. Not something I'd worry about in this application.

Eddie

NewToy · Mar 5, 2006

I've done the same thing before on implement gear boxes. I would assume it would mix as long as they were both petroleum based products. I don't see how they could get into that "curdling" situation. That sounds more like the oil & water scenario.

John

George2615 · Mar 5, 2006

I don't know what part of the country you are in but I don't suspect mixing would do any harm. Its like mixing straight 20 weight oil with 10w-40. The multi viscosity oil flows better in cold temps. Same would be true for gear lube.

RalphVa · Mar 5, 2006

The 90 wt is likely from a more naphthenic crude; whereas, the multi-wt is likely from a more paraffinic crude. They mix fine.

Ralph

tglass · Mar 5, 2006

Lost me from the start. What is the difference? Thought all oils mixed unless a water base. As I get older I learn alot more, so be patient. It just takes a little more time.

Soundguy · Mar 6, 2006

I also think they would mix fine. I've got a gearbox that actually reccomends using a flowable 0# grease, or if you can't find any, then to shoot a tube of grease in then add a few ounces of gear oil 'such as 90wt or 85/140' to partially liquify the grease. neat huh...

Soundguy