Well, im told mercedes has 8 year warranty on cats, mine ended in feb.. but at the time I had them checked at the dealer for rattling.. they said it was a heat shield, 140$ to replace/install.. months later when I start the car it rattled a bit..
Long story short I paid .5/hour labour ($60) to have them checked today.. Was talking to the guy while he hit it with a rubber mallet and he said sounds ok, but when car is warm it expands so he asked me a few things.. real nice guy and he just said f-it and wrote down that they need to be replaced... service advisor tells me he will replace it under warranty to come back in 10 days while they order parts
On the other hand, I paid 59.99 for 1 wiper blade, and 12.50 to install it... I heard they install for free?... they cleaned and vaccumed car , filled all fluids, total was 144$
saving 3800$ on new catts.. priceless
p.s.. after they are changed how much better will my car perform?
thanks!