Synthetic grease is just the oil portion the thickener or carrier is just as important I think. Not sure what all is compatiable though.
What are ya'll saying is a good grease? water resistance, extreme pressure characteristics, temp range, stickyness/tack, oil drop out?
I like some moly in my chasis grease as its some of the best EP additives. But gm seems to recommend lithium? thickeners.
There is a Timken load test that is suppose to measure the greases ability to stay put under squeeze loading I believe. The higher the number the better ability to stay put and not get squished out.
TRC grease Texas refinery corporation is suppose to be real good but they only sell full cases so its expensive for us diyers.
I usually get Valvoline synpower or Mobile syn. Just becasue it seems to be the best of the choices at the stores I get it. But imagine "Caterpillar", TRC, or some equipment recommendation grease or similar would be better for ball joints, tierods etc. Wheel bearing or ujoint grease I would tend to stay with automotive type like Valvoline / Mobile.