Alright so I have a 98 SH and just recently here in Wisconsin it has been as cold as -20° and even colder. It now seems to be leaking a ton of oil and I can't track it down. It leaks about a quart a day. It is dripping down from the back of the block and leaking onto the cat and it smells terrible because the oil is burning. It drips and leaks ALL over the cat. I have already checked the oil cooler o ring and it was fine. Replaced it with a new one. Still leaks just as much. Would the oil pressure switch cause it to leak this much? I don't know where else it would be coming from. Any help?

 

I would recommend giving that side of the engine a really good degrease and wash
down, then get her started and keep a close eye on things. That should make it a
lot easier to track down.