thats a VERY conservative estimate for the L-series i had 255k on my 81 and that car was ABUSED, three of the head bolts where broken, two of the cam tower bolts where broken, didnt change the oil the entire time i owned it, over heated it a couple times, was running super lean and would detonate in neutral and I'm sure the valve seals where going out also, still fired up for me every morning no problem, never left me stranded and ran great up to the day i loaded it onto the transport to its new owner! my old neighbor has close to 500k on his 280z and doesnt burn any oil and has never had any sort of real work done on it, minus a water pump change.