Yes it is not easy to reach. What I finally did after struggling many times is both the big socket type adapter that you turn with a ratchet. Drill two holes 180 degrees apart and fit two M8 bolts. Screw the bolts into the filter and turn. I have used a large screw driver and hammer before. My new method works great.
By the way, I changed the oil at Wal-mart once and they broke my pressure control cable. I noticed it when I did the next oil change at home. It was the only time I let someone change the oil in 8 years other than myself. never again.
Meza

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Meza
1993 190E 2.6
Advanced Diesel Systems Test and Research Engineer