Hello all. I have a 04 Case MXU 110 that Smokes light blue as soon as it starts. It clears up with high throttle, but smoke starts again as soon as I throttle back down to idle. The tractor sat for 5 months before I bought it. The oil was also 3/8 over the max fill on the dipstick. I just changed it with the correct amount, but it still smokes. Tractor has about 6,000 hours on it. It also cranks over more than it should before firing up. It runs good and strong. No noises, skips, anything. Any ideas?