Where abouts on the strut ?
If just the spring perches, I'd use a good calcium sulphonate thickened grease (marine grease) on the threads as it resists water washout well and resists rust of the body threads.
If on the main body bushes, I have no idea what their grease may be, but I'd be looking at probably a calcium sulphonate complex grease with 3-5% moly, something like one of CAT's heavy machinery greases, particularly their 'Desert Gold' grease which uses a synthetic base oil and is formulated for high temps/high loads. (there can be very high bending loads on an inverted strut body and I'm guessing the damper body runs in a DU bush inside the lower strut ?? )
$90 is a lot of moolah for a small amount of grease
I've been wondering if Redline CV-2 would work, or Amsoil GHB. I picked up a tub of valvoline syn-power but I'm not sure if I should use that.
I do have enough of the factory DMS grease to service everything one time, but I would like to find a less expensive alternative.
Is there any place to order the CAT Desert Gold online? It seems that the only place to obtain it is to get it from a CAT dealer.
That's what I've found out also. I have not been able to find out more details about the grease itself. It's stated as 100% synthetic, but no info on what kind of base nor additives. I'm just wondering if it would be safe to use with the PTFE bushings.
I just found this site with some more info:
Looks like good stuff. Considering it's 3x as expensive as the valvoline synpower, I really don't have a problem purchasing it as it's still far less expensive than the DMS grease.
Neo is excellent, the base oil is generally di-ester.
I used their products fifteen years ago when racing and at the time their wheel bearing and CV joint greases were superior to anything else on the market for race use.