have the stealers stitched me up?

[gajh1972]

Hi

Have just sent my c6 to mrc for a stage 2. They have told me that only 5 of the spark plugs are new, I had a full servivice from a main stealer about 1000 miles ago (obviously including spark plugs) Has anyone else come across this before - I understand that one bank is awkward to get to.

[Jim Haseltine]

The rear plug each side is a pain to get to - one because the PCV valve is in the way and the other because there's a pipe that can make removing the coil pack something of a puzzle, but I can't think of any other issues.

[cammmy]

How do they know? Condition or are the plugs different between the two banks?

[dannyuk]

How do they know? Condition or are the plugs different between the two banks?

Second this - how do they know only a few are replaced?