Changing differential oil viscosity?
Thread Starter
3rd Gear
Joined: Apr 2020
Posts: 3
Likes: 0
Changing differential oil viscosity?
My 2002 is leaking differential oil ever so slightly from the driver side output shaft seal. (I know, "known issue").
It's not enough to even drip to the ground at this point (mechanic described it as "weeping"). I'm about to change
the fluid and was wondering whether switching to 75W140 might help slow, if not stop, the seepage.
It's not enough to even drip to the ground at this point (mechanic described it as "weeping"). I'm about to change
the fluid and was wondering whether switching to 75W140 might help slow, if not stop, the seepage.
Team Owner
Joined: Dec 1999
Posts: 34,873
Likes: 487
From: Lacey WA RVN 68-69
NCM Sinkhole Donor
I would replace the gasket/seal to stop the leak. A higher viscosity fluid really won't do much to stop the seeping. A few of my friends with C5's had the same issue and they wound up doing a seal replacement.
Race Director
Joined: Apr 2007
Posts: 11,152
Likes: 890
From: South Western Ontario
Yes, check the vent. It has a spring loaded cap that will let air out when it gets hot but not back in when it cools again. It seems the idea is to hold a vacuum when colder to help keep it from leaking.
