[Lapkritis]

Originally Posted by 911nuts

Hello,

I'm rebuilding my 964 engine, can anyone tell me if the DC55 can be used on the 'red' through bolt o-rings that are included in factory Porsche gasket sets? I'm not sure if they are Viton.
Also, I have purchased Henry's kit, are any of the products suitable for use on the factory Porsche 'black' cylinder base o-rings or are these only installed dry?

Thanks in advance.

With regard to the red o-rings, I would echo the warning by DOW itself against use of DOW corning 55 molykote.

From DOW:

COMPATIBILITY

Molykote 55 O-Ring Grease has

been shown to swell natural rubber.

However, compatibility of the

lubricant may vary with the

plasticizer content of specific

materials (especially elastomers).

Small-scale compatibility testing

should be conducted prior to the

use of this product in any

application.


Molykote 55 O-Ring Grease should

not be used with the following

materials unless thoroughly tested

for your specific application:

Silicone rubber (SR)

Polycarbonate (PC)

Acrylonitrile-butadiene-

styrene (ABS)

Liquid oxygen (or other strong

oxidizers)

Source is spec sheet on product site:
http://www.dowcorning.com/applications/search/default.aspx?R=392EN


No compatability concerns with Krytox... It's inert.