ILUVMILS: What all is involved when just replacing the tensioner on a V8 W126? I do not have any chain rattles and it does not concern me since it is a double chain, but the "ZZZZRRR" sounds from the front of my engine upon first startup when the oil pressure is going up does have me concerned, as I have been told it could be my tensioner causing that noise. I would not mind changing that, if it were easy/low cost repair.

Thanks for any information.