Grease question...

the mystic j-t 7 gear oil is great & all mystic products are great. i.m.o.

 

Using a quality grease means you will use less of it...

 

I think that study was pretty much geared to high speed bearings in industrial use. I haven't seen any info suggesting any automotive greases have any compatibility problems except with the very old (now obsolete) greases from the pre-1960's.

 

www.bobistheoilguy.com

lots of info in that site...

 

I really do not think mixing grease, oil is as bad as some think. I thought about it.. I have changed wheel seals on my truck & trailer & I DID NOT get all the old oil out, but refilled it with new. never had a problem. your not going to get every bit of old grease or oil out of anything unless you clean down to bare metal. your not going to get all the old oil out of every bearing, crack & crevice. on my trailer, I had grease bearings. I had one go out & when I went to replace I decided to go with oil to lube instead of grease. I asked the parts house to look up my bearing,race & seal & see if there is any difference in oil vs grease on these parts? NO they use the same parts. Guess what I did? I took the cap of the wheel, replaced with the oil type seal cap & filled with gear oil. yeas gear oil in with the old grease. I never had a problem. the grease looked old, dried up a lil in cap. so I figured, some oil would lubricate it. who would of thought 5 year old grease mixed with new oil. it did not harm a thing. in any way. this was done 6 years ago. no matter what you are greasing, I don't see how you get every bit of the old out. some will remain to mix with the new. I am not saying you should purposely mix them, but having a little old with a lot of new pushing it out it o.k. i.m.o. I always go with real world experience than what is written on a product or for a product. I was also told you cannot fix a hole in the sidewall of a tire. after several trial & errors. I can fix a hole in a sidewall truck tire to out last the tire itself. but that is another story.

 

Castrol Agri .. its one of the better fling resistant greases out there.

Seems to stay in the uni joints reasonably well..

 

Pick out a grease and stick with it. Don't deviate, most greases do not get along with each other. if your going to keep it for a long time, grease regularly!

 

Personally, I have two grease guns, The one I use the most is synthetic, I buy a case and I grease often, you only have to grease till it is full not till you can see new grease.
The other grease gun I have wheel bearing grease, I use that in "S" cam tubes, and for hydraulic ram pins.
I believe I paid $6 per tube for the synthetic, and you want to clean off the top of the zert. Also if one leaks back after you lube it, change it.
I have been told greases do not mix, I do know if you do not grease water will destroy most any part.

 

The types of grease are many and they are actually different than each other. Some have anti-sling additives that work great for U-joints and splined drive line slips. Others have extreme pressure additives that work well in heavily loaded roller bearings and the like, while still others will have high temperature additives that make that grease suitable for applications in high working temps.

Per unit of measure, say an ounce of grease, only so much "good stuff" can fit. To get a grease that works in high temps for example, some of the high pressure and anti-sling capabilities may have to be removed or compromised.

You can mix most lithium greases with each other, and most moly greases with each other. Just dont mix lithium with moly.

For general chassis grease, I have found that a good quality lithium or lithium complex that has anti-sling capacity and at least water resistant if not waterproof qualities has worked well. I have been using the Dyna-plex Ultra blue http://www.universallubes.com/index.php/products-info/253 for several years now and really like the way it can shed water and not separate when it gets warm. It has been a great grease for my applications and u-joints dont take half the grease they used to when serviced at the same interval. And that was still using a good grease from Texas Refinery. I tryed a "cheap" grease once,...............just once. That was cost enough to not try it again. Bacon grease would have served better.

IMO.

 

IMHO, for info on oil and grease, he's da MAN!!!!!