Leaky Diffs with new oil.

[Heather & Jeff <hjr@buffnet.net>]

On Fri, 13 Sep 1996, Brendan Rudack wrote:

> Not sure what causes it but I have seen 3 Q's switch to synthetic tranny
> fluid and suddenly start "weeping".

Noticed the same phenomena occur with other tranny's and diff's.  Bumped 
into a chemical applications engineer for one of the big lube companies 
one time at a trade show and asked if he knew why this was.  His answer 
to me (I have no clue if he was BS'ing) was:

1. Additives in the oil cleaned up junk around seal/metal interface that 
built up over time, this junk was helping seal, junk now gone, seal 
leaks.

2. Additives in oil might be different in new oil than old, which cause 
swelling and changes in seals, causing leak. 

Could this also be the source of pentosin leaks in racks and pumps as 
discussed earlier?

Jeff 

'88 80q