Does anyone know how often an IF the tensioner Belt needs to be changed on a Mercedes-Benz 1991 300SE with 150K?
I have been researching and lloks like the only possible concerns lie with the 380SE, which feature a Double camshaft.
Seems like the M103 Engine only has a single and timing belts not an issue even after a lot of mileage?
Please help!

p.s: I love this car!