not sure how long my engine (4afc 284000k's) has left in it but by the sounds of it, it should last a while I hope, I service it whenever I can or every 5000kms (I work at toyota and we get free genuine oil and a genuine oil filter is only $10 so it doesnt cost much to service) it has used a little bit of oil but blows no smoke has about 284000k's someone else from work had the same car and engine like mine and he revved the crap out of his all the time and at 330000k's he did a tapper cover gasket and the engine was spotless, so if you flog them and look after them they should be fine.