XC90 OIL - WHAT KIND DO YOU USE?
According to the Mobil 1 hotline, (800) 662-4525 in the US, officially the oil shouldbe changed at Volvo's recommended 7500 mile interval. However, we all know synthetic oils last much longer than that. Commercial fleets running large engines use oil analysis and find they can extend their drain intervals many times. The problem is that microscopic particlesare either generated by normal wear or enter through the air system and can contaminate the oil. Unless the oil is analyzed periodically to make sure the particles are not building up, you risk shortening the life of the engine.
Unofficially, some people change Mobil 1 at 15,000 miles or more, but change the filter more frequently and seem to have good luck. Personally, I expect to keep my Volvo for over 200,000 miles, and changing the oil is pretty cheap insurance. I figure that if I change the oilwith Mobil 1 at 7500 miles instead of 15,000 miles, I've spent an extra $600 total over the life of the car.Not a bad investment.