My 2008 GMC is coming up on the 100,000 mile tune up. This one changes all the fluids, trans, brakes, antifreeze, plugs and plug wires. Should I do it? I have heard different opinions around the beer cooler over the years and would like another opinion. It cost $1000.00, at the Chevy House, and I would rather put the money in (well you know) my boat.