Yes you should always change the oil filter when you change the oil. No matter if it is synthetic or not. Now also don't think that since you are switching over to synthetic that you can go 20,000km's between oil changes. I would still keep up your regular intervals of 8,000km's on the oil (or there around).
Synthetic oil does NOT mean that you can go millions of km's between oil changes, it simply does a much better job of cleaning, lubrucating and cooling a motor.
Switching too it is a VERY good idea and investment in the life and running of your engine. Paying a bit more for oil changes will pay for itself in the long run.
Good move, just keep changing that oil/ and filter together. I was once told some wise words by an old mechanic."Do you put the same underwear on after a shower?". Probably not
Cosmo. Mazda TEch
Saturday, January 13th, 2007 AT 3:44 PM