My mercedes E350 was misfiring one morniing so I called and made an appointment. After starting my car in the afternoon it was no longer misfiring, but it needed an oil change so I took it in anyway. I mentioned it wasn't having trouble anymore put to go ahead and replace the plugs and do the oil change. Then when I get the bill I see they charged $249.95 for diagnostic work,$228.12 for 6 spark plugs and $293.86 labor to put them in (2hrs to install 6 plugs). When I said this was a little excessive he said that's what his book says to charge and that diagnostic equipment was expensive. I mentioned I could buy the same plugs at NAPA for $31.13 he said they don't buy from Napa!! For almost 20% reduction I would think they should shop around.
Anyway, after paying $1029.26 for an oil change and plug replacement, I don't think I can afford to use their service anymore and will drive to Calgary for my next service. It's too bad because I try to local services when possible