Yeah I had a falcon years ago and had a nasty motor built.. after a year of backing it in and out of my garage the valve covers sludged up and looked like blown head gaskets... I finally had a mechanic tell me to drive the hell out of it... cleaned right up.yeah, if you're doing a lot of short trips (less than 10-15 minutes or so), especially if you're living somewhere that gets cold during winter, that sort of thing wouldn't surprise me