[rfuerst911sc]

I was thinking last night about the engine oil , and I have no way of knowing what type of oil is in the car currently . Which brings up the question when any of us buy a used vehicle unless we know the person or there are service records NONE of us know what is in there . So are all of us taking a " chance " doing our first baseline oil change with synthetic when we buy a used vehicle ? I'm making the assumption that most of us use synthetic oil which may or may not be a correct assumption .

This vehicle only has 42,000 miles on it , if I were to assume that every oil change has been done with conventional I also have to assume there can't be that much sludge in the engine . I base that on common sense of the mileage and looking at the oil fill cap ( clean ) and looking into the valve cover via the filler hole . Not scientific but it's all I have to go on . Volvo recommends Castrol 5W30 per the owners manual but doesn't specify conventional or synthetic . I think I will use Castrol Edge 5W30 synthetic and be done with it . I will run a few UOA's and if all looks good that will be the oil of choice .