My oil cap spooked me this morning, as some of you may know I have suspected a LIM problem so I have been checking my coolant oil and oil cap everday looking for any looming problems. This morning after driving my car for around 4 minutes I would say, I checked the oil cap and there was some white stuff on it. I figured alright I will drive it to work, look at it again, and then if it is worse or what not I will just have to take it to the shop and take a day out of work. When I got to work after about an hour of driving the oil cap looked as clean as a whistle, the oil level always looked normal and on the dip stick the oil itself looked no different. Tempratures wen't well below freezing last night in my area, but I don't think it could have been oil frozen on the cap, it takes serious cold tempratures for oil to start to freeze. Also my coolant level has remained the same for around 3000 miles now. I am going to take it in to get looked at soon but I am just wondering are there any other causes for a whitish substance on your oil cap beside the various gasket problems you can have?