Don't just drain and fill...this leaves quite a bit of tranny fluid in the system...do a full flush as described on Bay13. I don't think it's necessary to do it as often as 3 oil changes but that's up to you. Make sure you use the right oil when you do. A lot of people have gone with synthetics, but read up on other's experiences here...the AWD tranny is especially finicky when it comes to the type of oil put in and will buck and burp if it doesn't like it, but be smooth as can be if you get the right one. Since my car isn't AWD, couldn't give you what's best...just read your manual and then look around. Many say Mobil-1...others are saying Amsoil...etc., if you go the Synthy route.
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Current owner of a '04 V70 2.5T. Previous owner of a '94 850 Turbo Wagon
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