I get paranoid about the oil but I usually leave the car for a few months with 3g done on the oil so I just flush it before I drive it. And no, don't warm it up before you flush it, drain it cold and pour some fresh oil with the sump plug off. All the oil from the head would of drained down in the 3 months for sure Not sure what to do about the car cover in the sun and rain but if you get a $50+ cover like mine it's made with fabric on the inside so it won't stick to your paintwork. I leave mine garaged though. Just get a decent cover over $50 thats a waterproof fabric material and your paintwork will be fine. If you put wax on it for sure your paint work will be affected in the sun. Disconnect the battery, take it out and leave it somewhere warm and dry. Leave the car with as little fuel as possible and plug up the exhaust. Make sure the car's clean before you cover it.