you must change the diff oils, as the factory puts in a break-in oil that won't last. As for the enigne oil, I do mine every 3 or 4 months (I put on very little mileage as this equates to about 3000km). You should read carefully the manual, depending where in Oregon you are, you may fall into "severe" use during the winter
I consider the 2006 GV one of the worst vehicles to change oil on - I do it myself - so I have switched to 5,000 miles and I use QS synthetic. On most vehicles I change it every 3,000 to 4,000 miles and uuse regular oil.
The filter is hard to get to and the oil wanting to squirt forward are unnecessary issues to deal with. My wife's filter is also hard to get to but at least the drain plug is on the bottom. My daughters car is the best, oil out the bottom and filter accessable on the front of the motor.
Long way of saying that for me which oil and how often are related and depends on how easy it is to do. I just checked Sythentic oil pricing last night at Wal mart and 5 quart containers of QS synthetic were $20 versus $12 for regular - not that great a difference (but probably also small difference in functionality too).
The guy at Valvoline that did the oil change complained about the filter location to be one of the worst. They tried to offer synthetic but I knew that there is no real benefit if the oil get changed every 3000 - 5000 miles. I'll definitely use 80W-90synthetic for the differential.
my GV does short trips so i change the oil every 5k miles with synthetic. You can often get it at advance auto parts for less than $3/qt when its on sale buy1get1. August it was Valvaline Synpower and before that it was pennzoil platinum.
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