Weather stipping on doors is in good condition no tears or cuts except that its doesn't hold its place well, some places it become very brittle.
Is there any product which can restore this rubber?
Thanks

 

Just get new ones.......

 

Gummipfledge (spelled something like that) BMW dealers have it and you can get it on line. About $6 for a small bottle that will last for years.

Works great for keeping door seals in good shape. Apply once or twice per year.

 

Meguiar's Vinyl/Rubber Protectant (in the Marine line) FTW. If not available, use Armor All. It's an old detailer's trick.

 

I also like plain old silcone spray, helps keep 'em from freezing too.

 

I'd avoid silicone. Although it looks good and seems to work at first, it will deteriorate the seals over time. That's why they took the silicone out of ArmorAll.

 

Interesting, where did you hear this?

 

Well, the 'old' ArmorAll really faded and hardened the dash in my 92 Accord. There is good silicone and bad silicone. There's in-depth threads on it at autopia. Many products have some silicone in them (the ok kind), but to use straight spray silicone in the door seals isn't a good idea.