I have a 95 GT that I bought not to long ago, I was going to change the intake to a GT-40 and when I got the intake off the lifter valley is sludged up pretty well. I guess the guy hadn't been changing the oil like it was supposed to or at all from the way it looks. Can I spray down everything with brake cleaner, or engine degreaser, and flush it all into the oil pan and then change the oil with some fresh Mobil One?