My sister just bought a 91 318is. Some questions: 1) What would you do to service now? I think it needs new rotors, but would you do a full tune up, etc? I saw posts about the gasket problems; a local mechanic said to replace if it goes bad, not worth checking. 2) Is stereo standard DIN chassis? 3) With 4 snow tires in winter, is it possible to take into the snow country for skiing? Thanks.