Oil filter wrenches are typically for removing filters. They usually go on as tight as you can get them by hand. It's something like 3/4 to a full turn after the seal meets the contact surface. No more than that unless you read the Jiffy Lube training manual. So, no, there is no better tool for tightening this type of filter than your hands.

To be honest, I don't think the W126 CD manual comes with maintenance procedures as the W124 CD manual does. It could be that there's a torque spec on oil filters. I'll leave that for someone to contribute. FWIW, I don't think more than 5% of the folks on this forum tightens this type of oil filter to a torque spec if there is one.

For a great price on filters and many other parts, use the FastLane link at the top of this page. You'll be helping to keep this forum going. How much advice has the dealer offered you with the purchase of an oil filter?

Sixto
95 S420
91 300SE
87 300SDL
83 300SD