|
A straight 30w motor oil is a no-no for this engine, unless he meant 10w30, which is the recommended viscosity under normal conditions per the owner's manual. Brand is largely (or almost exclusively) a matter of personal preference. Just about anything that you can buy off the shelf meets, and probably exceeds, Volvo's specifications for use in any of their gas engines. Shell Rotella is a great oil and can be had inexpensively. It's also available just about everywhere (YMMV). Castrol also seems to be a favorite on the BB. Nothing wrong with Valvoline, either. I think that the most important thing is to use good, high quality filter with an anti-drainback valve (e.g. Mann) and to change the oil frequently. 5,000 miles is a respectable change interval for dino oil. More frequently if you use your vehicle primarily for short trips at slow speeds, as condensation can build up in the crankcase under these circumstances. There are probably few, if any, benefits to be derived from switching to a synthetic motor oil at this point in your car's life.
|