Before we change a grease type or manufacturer, we need to know if the products are compatible, so that there is no adverse reaction that could cause failure of the grease to lube & the part to fail. Yup all grease recipes aren't compatible!!!! Product Data Sheets usually offer up basic info on the grease recipe. If in doubt, call the manufacturers customer service hot line, or "E" mail their customer service tech folks for advice.

If the lubed part is sealed, we need to make sure the grease recipe is also compatible with the sealing material.
This chart offers up some recipe guidelines that might prove helpful.
Grease Compatibility

If we're going to change grease types that aren't compatible, or may be borderline, best to clean All of the old grease out before adding the new.

Things like wheel bearings come to mind for removal & cleaning when changing to an incompatible, or borderline grease.

Things like ball joints that are sealed with rubber boots need compatible products, as we can't easily remove & disassemble for cleaning.

Things like home & garden equipment wheels with out bearings, or say a marine engine swivel pin bearing with zerk grease fittings, we might be able to flush out the old grease if its not too dried out, by pumping a good bit of the new in, while it pushes the old out, but its always safer to take em off, clean & re-lube if possible or we're in doubt.

Some grease lube thoughts for pondering.

 

More grease compatibility chart choices, choose the one that's easiest to read.
grease compatibility charts - Yahoo! Image Search Results

 

The skinny on grease compatibility. The Skinny on Grease Compatibility

 

I guess I just like colorful stuff.

I've usually used this one:
https://www.ridgidforum.com/forum/at...lity-chart.jpg

But, whatever keeps you from mixing the wrong ones is a good chart!

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Yup grease has a lifetime!!!! Storing Grease to Avoid Bleed and Separation- If yours is more than a year old, depending on how it has been stored, it may be due for replacement!!!!