The oil cooler, and hoses, always seem to leak after a year or so. They are a pain to repair.
I haven't had any oil leaking on the 4runner, so haven't looked into how tough or easy it would be. Personally, I'd leave it for now, but if you do have to fix leaks more than once on it I'd consider bypassing it (but if so, being careful on the oil temp)
On a 3000gt I had a tough enough time trying to replace a hose to the oil cooler, mainly because the bolt or banjo bolt was stuck. It's tough to put a breaker bar on it, and with that leverage you don't want to bust something.
Yep, finally got some snow, though on the low end of expectations. Diamond Peak is 4 minutes away, and at our same base elevation, and they got 14". I was expecting more Thursday night so didn't get out to play in it early Thursday, but it was still fun. They opened up some new runs that haven't been groomed, but I was nicking some rocks and such when we've went down a few of them in the last few days.
Not perfect by any means, but it's getting better and is still fun if you can avoid the crowds. At DP even with the 3 kids (3, 4 & 7) on the easy lift and at peak time of 11:30am, we never had to wait more than 5 minutes. And after lunch on the rest of the mountain with the 2 older kids, we never had more than a 2 minute wait. A smaller mountain isn't for everyone, but it does have advantages.