Good idea to do the cam belt if you have no history of it being done. I think you have a bug? so should really be on its 3rd belt by now as they're 5 years/50000 miles so should have been done on age.
I've always used Millers oils as well and never had a problem, although there was a recent thread floating around (no pun intended) about additive drop-out...
If you're keeping the car then do the gearbox and diff fluids too, a 5L bottle of 75w90 is just about enough to do both on a 5 spd WRX but not sure if the 6spd uses a bit more?
Last edited by SpecB; 18-04-2016 at 12:06 PM.
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