Be sure to do a search and read the other threads on changing the oil cooler lines. I say this as some members reported that they ruined their oil cooler do to the oil cooler hose nuts being corroded together in the oil cooler thread area. I lost several threads on mine when I took the nut off. I found a piece of the oil cooler (aluminum) threads had stuck on to the inside of the (Steele) nut threads and when I backed off the nut it proceeded to cut the threads behind it.
One member even cracked his oil filter housing trying to get the hose off there. Please take the time and read some threads.

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84 300D, 82 Volvo 244Gl Diesel