Yeah the Dorman grease pouches are small. You can buy extras in the help section at o'Reilly auto for $1.99. I bought a big tube of BMW grease years ago on eBay and I supplement the pouch by 2x.

For the longevity of my boots. This is a tough question. The problem was the first boot was silicone and it went on a diesel rabbit that was destroyed in a fire shortly after I booted it. Hence my entry into w123 diesels in about 2003. I then booted one side of my 240d but it got sand in the joint and even though I had four nice Dorman Silicones on the car after a year it started clunking. I bought the Cardones and never looked back. They had stock boots on them and they naturally cracked by the time I sold he car last fall.

About two years ago my SD started showing cracks. I whipped out the Dorman tool and bought some Raysbestos boots that looked awfully like unifits. They were cheaper. They were not as flexible and like the neoprene dormans I bought this week. I tried to put the inner on inside out and invert (I've done all these with the axel clipped in the diff cuz I'm lazy and that is kind of the purpose of this tool). It tore. I was careful but the Raysbestos boot wasn't flexible enough. I had to crank my air pressure way up to open it and it tore.

So I went to o'really and got a real Dorman boot. -001 variant. It didn't tear. Then I mounted a non inverted Raysbestos boot on the outer joint. These still look great.

Now let's think about the friends cars. About 2006 me and a pal got laid off and we were trying to help each other save money. I booted his wife's 1996 Camry with the tool. It worked till she bought the first Camry hybrid (and maybe beyond that) so that must have been 2008. Two years.

Then another pal showed up in his 94 Acura integra in 2012 and needed a boot. Dorman again. He sold the car in 2014. For all I know this POS is melted down.

Hope that gives some indication of how long they last. I didn't pay attention to which were silicone or neoprene hence why I dug up your post. The two on my SD Dorman and Raysbestos are the stiffer rubber so I think they're neoprene. There were two pn that come up for he boots. Lemme see if I can find them. Ah yes...Dorman 03680 and 614-001

Hope this helps. Overall I've had good luck with the boots. The guys who complain a lot about them are the ATV guys. But that is a very harsh application.

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79 300TD “Old Smokey” AKA “The Mistake” (SOLD)
82 240D stick shift 335k miles (SOLD)
82 300SD 300k miles
85 300D Turbodiesel 170k miles
97 C280 147k miles