My dipstick oil level fluctuates wildly. Per the book, I warm the car for 5 minutes and shut off the engine - check the oil and it's halfway between min and max. Then, I go for a 25 minute drive, shut down and check it immediately (a few times) - it's now two inches above the max! I noticed that now I have a small oil leak from the airboxes (at the intake clamp). Is this an overfill situation? How would the oil get all the way past the valves to the airbox? Weird.