98 gtp 154k i just changed oil about two weeks ago..... and last week i checked stick.. down to 1 quart... on my boost guage and torque app vac is at 0.7 and full throttle 1.4 no more... the car is smoking like a train when on throttle hard.. or just to pass someone... sparkplugs has oil coat over them mainly on threads.. and tips are all black... ive changed valve stem seals... im changing the pcv tonight and will grab a compression tester......