the o rings being hard should not have caused a problem all at once. the invoice said oil bulk, so that means that they took it out of a hose. so if the wrong hose was pulled down you would get the wrong oil, even possibly tranny oil or such. i am thinking wrong oil. i would drain it out or at least a quart and look at it. if any suspicion of it i would change it pronto. i am thinking looking for a mechanical problem is barking up wrong tree.

__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.