I have two Volvos with the Manual 5 speed tranny. A 1995 Wagon (5 speed) and a 1999 Volvo S70 (5 speed.) Yes, as many people have noted, Volvo does not recommend changing the synthetic gear oil. Do I agree with this, well frankly no. They are trying to devise a maintainence schedule that makes it easy for the consumer and gives a resonable service life out of the tranny. The tranny does have a small vent hole to the outside which means over time dirt etc. does get in there. Not to mention after 60K even synthetic gets kind of nasty. I change the manual gear box oil every 60K. It is cheap insurance and my own European garage recommends the same on Audis and BMWs as well and I value their advice highly. Will you hurt you car by driving and towing without changing the manual tranny oil. I seriously doubt you would hurt it one bit, but I would consider changing at some point if you plan to keep the car long term.
Good Luck.
Nate
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