Here’s my unusual problem… I drive ~50 miles to work, and I occasionally drive my 70GT, and this happens one to three times each way. The car will cruise along for 20-30 miles, and then a slight burning rubber smell will become apparent in the passenger’s compartment. About the same time I notice oil smoke coming from the back of the car. I can slow down or put the car in neutral, but the smoke continues. However, if I depress the clutch and turn the CAR off and then right back on, release the clutch, and let the momentum restart the car, the smoke stops. In addition, there is no appreciable oil drop on the dip stick.