So I started gathering supplies for my 90k service in much the same way that I did for my 30k and 60k services, however, I think I decided that I'm going to change the timing belt too. Instead of 105k intervals for the timing belt change, I think 90k intervals are more appropriate because I will have to drain the coolant and remove the radiator to access the belt and I'll be doing a coolant flush for my 90k service anyway, so why wait another 10k miles just do go through that messy process again? Might as well kill two birds with one stone.
Anyway, I've been reading a bit about the timing belt change and I came across this excellent How-To video on NASIOC which I'm going to follow when the time comes: Meatys Timing Belt How-To Video (HD) - NASIOC
I've decided upon a direct OEM-replacement timing belt instead of the Gates blue belt or any other aftermarket belt for various reasons which I won't get in to right now. The issue I'm still struggling with is whether or not to change my water pump and/or oil pump while I'm in there. There are two very strong points of view on the subject:
1. Since changing the timing belt is somewhat of an involved process, it would be wise to replace those two parts at the same time since they're easily accessable when everything is apart and failure of either of those two (hundred dollar or so) parts could cause catastrophic engine failure and cost thousands.
2. The water pump and oil pump are parts that typically don't wear out very often, so it's not necessary to replace them at 90k.
I'm planning to replace the belt, pulleys, and tensioner for sure, but I just don't know if the water pump, oil pump, thermostat, and/or cam/crank seals are necessary. Given my attitude about maintenance, I would think this would be a no-brainer: replace absolutely everything while I'm in there and don't even think twice about it... but for some reason I'm stuck.