Looking for advice on places to look BEFORE I take the plunge and remove the head. My 97 with 250k miles constantly has the faint smell of burning oil but startup and idle shows no smoke out of the exhaust. The only time I can get smoke to be visible from the exhaust is (from idle) to step on the gas hard. Doesn't matter how long it's been running or if it's in park or drive. A quick snap of the throttle will yield a good puff of smoke. I am running rotella T4 15W-40. Normally I know that smoke under acceleration means rings and startup/deceleration means valve seals. But this isn't either. If I come to a stop sign and get on the gas it will puff smoke for the initial blip of the throttle but if I stay on the gas the smoke stops. It's just simply the on the first snap of the throttle. Any tips?