Hello all, I drive a 98 Isuzu Trooper that burns a quart of oil every 600 miles or so. No drips or noticeable smoke, just a sooty tailpipe. Much has been written about this motor and I'm not trying to rehash all that. I'm wondering what you guys thing of OCIs since the motor is contantly getting fresh oil added to the tune of 8 qts between oil changes in a 5 qt sump? Should I just change filters more often and dump the oil less often? FWIW - I am currently changing the oil every 5K or less.