$90 for a synthetic oild change? That's rediculous and I changed both my 4Riunner and Focus with synthetic and spent less than $70 for both.
I am comfortable with changing my synthetic once a year (cars have about 4-6000 miles each at the change) but with my very raced turbo Eclipse I was changing the synthetic about every 4000 miles since it was a high severe duty drive nearly all the time.
'12 Focus Red Candy SE Sport 5 spd
'99 Toyota 4Runner Sport
'11 Subaru WRX STI Hatch