Hey, I got a 2015 Evo X MR, and with all the covid and thus WFH, it hasn't even hit 25k miles yet but it it time for the 60month (well beyond it actually) maintenance.

I am wondering how long in terms of years do the things like the belts, the reserve fluids and etc. are supposed to last?

I have already done the TC-SST oil with diaqueen at 10k miles a couple of years before, so I am not worried about that one until it actually hit 25k miles (doing a 15k mile interval since all of the stories about it helping to not make the thing blow up), but I am worried about the plastic / oil being expired due to age on the other stuff.

And if I am doing the service, is OEM for the belts / oil the way to go? I know for TC-SST other oils may be as good, but the oem diaqueen seems to be the preferred option given how expensive it is when something goes wrong.

Anyone know?

 

I would definitely stick with the OEM SAE90 in the Transfercase and rear differential and OEM Diaqueen in the transmission. However, things like belts - take a look at it. There’s a 99% chance it’s fine. If it’s not and needs to be replaced, any decent $25 aftermarket belt will do. Certain things I believe in OEM only and other things you’re good to do aftermarket, as long as it’s a decent product/brand.

 

You should do coolant and brake fluid as they break down over time. Especially the brake fluid as it absorbs moisture sitting still. I agree that if you do the transfer case and rear diff should use OE Diaqueen. I'd also look at your power steering fluid. Mine was nasty at 35k!