Your basic warranty has already expired due to milage, but there is still coverage on the catalytic mufflers. There have been many reports of cracks developing in the converters. These are very expensive to replace so have them checked while they are still covered by the emissions warranty.
Also have the brake fluid and coolant changed every two or three years to avoid costly repairs in the future.
I had them do service on the trans fluid as well...
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you have 16 plugs at $8-$10 each so you have $128-$160 in plugs alone. Figuring 2 hours of labor at $100+/hr you are at $328-$360+. The problem area is the drivers side bank. The tech that changed mine had to remove the wheel and wheel well liner to get to those plugs and that took a bit of time. Maybe there are new methods now but I doubt if you will get by for less than $300.
Just checked. OEM are Federal Mogul Champion 3071 platinum plugs. These are available at http://www.rockauto.com for $2.08. Federal Mogul also makes the pistons in these engines.
Plugs for the M112/M113
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Bosch platinum F8DPP332
Beru platinum 14FGH-8DPURX2
Champion platinum 3071 (OEM)