APD

Manual says NOT to use the Grey valve cover gaskets, only the black ones.

I ordered a set from cummins and they are grey.

Whats the difference?

BC847

Who's manual? I've had the best experience with the grey.

APD

I thought this was from the service manual because the pictures are taken from there....But the text may not be.

#11 is where it says not to use the grey ones.

http://dodgeram.org/tech/dsl/valve_adj/12_valve.html

simplysmn

I am useing the Napa Blue and so far so good

TJE

APD.....IMHO the article is wrong! I bought mine from Cummins and they are gray! I thought it was the black that are not any good? Anyway??

user name

I also use the blue one Fel-Pro brand they get relabeled as NAPA too.

56speedy

I use the Blue Fel-Pro ones and have had them on now for 3 years and no leaks in hot i.e240 water temp ops, and cold here in Alaska -35. They work very good.

NJTman

Ditto........

torquefan

Have had a set of the gray Cummins ones on my truck for 6 years or more without a hint of seepage.

peckens

The manual was also written 20 years ago.

93-12Smoke

I use red RTV

Crossy's son

I have 2 blue, 2 black , and 2 gray on my truck. all napa had at the time. None leak

Greed 93

Imo rtv or any sealant, plugs piston cooling nozzles and really cause accelerated bearing wear.

barrytransport

Depends on how liberal you are with the RTV and where you apply it as to whether it needs to be there or accidently got put there. Orange or black rtv is all i ever use and never have a problem. Tore a gasket one night at a pull and all we had was an old tube that was half hard and had to cut the top off to get enough out to do the job so i said to myself ... "Self" (thats how i address me when conversing and no one else is around) I hope it works and ran many a mile after that with no leaks

jimbo486

Cummins gives me grey ones... I use them and nothing else.