Can you mix bearing grease?

No....
Unless....it belongs to someone you really hate. Then go for it :-)

you may add to the problem by doing that cos next time you change the bearings the blue and red grease would have mixed and made purple grease lol :-).

have mixed heaps of types of bearing grease on the boat trailer with no issues, rang a mate who drives a truck (uses heaps of grease) he reckons that it doesn't matter as long it is bearing grease. His motto is if they haven't got the brand he normally uses in stock he aint gonna wait for it to arrive he will use another brand.

to be safe lob don tothe local mechanic and ask him.

As far as i know you shouldn't mix greases because of the properties in them and they can reduce bearing life if mixed. Horses for courses in grease so you need to make sure you use the correct one for the application that you are using it for
Tim

Go for it.

I can assure you that it wont cause any problems.

Apart from that, there is no guarantee that just because a grease has the same colour, that it is the same grease........so putting in the same colour greasae will mean nothing anyways...........lol.

Seriously, colour means bugger all.

I would however ensure u use a good quality high temp bearing grease whenever u do trailer bearings.........particularly those with smaller wheels as they can get very hot.

The blue grease sounds like it could be similar to the high temp bearing grease I use but there is only one way to no for sure and thats to take a sample and send it away for testing.........plus a grand or so for expenses.

Fact is that when u put the grease in then u should remove most of the old grease by the simple action of putting the new stuff in so it really wont matter anyways.

Just be careful not to mix lithium soap based grease with clay based grease.... The two of these will not mix very well and definately shorten the life of your project...

You can mix any coloured lithium and same with clay but not together...

For bearings under 62mm OD you should be using something like a shell alvania RL2...
Which is a lithium base...

colour is only the manufactures choice, as Voxy said yes you can mix any lithium based types together, as for basic clay based greases, but dont mix moly and non ,moly together . Any good high temp bearing grease will do the trick, 95% of grease sold and used in aus is a number 2 grade which is sweet for most applications. Oh and never use a moly grease in tapered roller bearings.

are you hand packing them or just pumping in new gear?