My 98 S70 T5 has an oil leak in the hose that is directly beneath the upper radiator hose. It's leaking at the bottom connection where it connects to a metal tube. What is the name of this part and is it difficult to replace?
Thanks for any help.

That is one of two oil cooler lines coming from the oil pump in the front of the engine. Usually, it is just the O ring that has failed.
Hard to replace? Just difficult while lying on the garage floor and not being able to see the fittings properly. The dealer will replace the entire hose for a considerable sum. Less than 1 hour of book labor.

Klaus
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Please answer, we need to know if the advice is good or bad. The 164 has a new home, all I am left with are 2 turbos :)

Thanks Klaus. You're right on spot! I called the dealer and hose assembly is $138 otd. O ring <$1. I may spend a little more and get a viton o ring.