1979 911SC with 182,000 on the clock. (I've owned it for 6 years and put 6,000 miles on it) Engine has never been opened, no smoke ever, does leak. I've done the tensioner & pop-off valve upgrade. Taken to red-line everytime I drive it without any problems. Oh ....I did pull the engine to have the transmission rebuilt, new clutch and motor mounts. (2 months after I purchased it and I had a PPI done)