Both my Dad and sister have Nissan Pulsars fitted with the 1800cc J-Car engine (Nissan and G.M. made a reasonably good car with these). Dad's has 275,000 km on Mobil 1. Sis' car has 160,000 km on whatever the dealer put in for the first 2 years, then I think Dad's using castrol. 10,000km oil changes. But sis is in a wheelchair, so there is a LOT of very short trips in the thing. Guy over the road brought it to her attention that the tappets were very very noisy, so she took it to the dealer, who "flushed" it (I know nothing about what they used), and the rattle is gone. Wish they'd rung first, as it's within the period that I've known about this board. I reckon she needs further and ongoing cleaning rather than a one-off bomb. Any ideas ? Switch to Delvac 1300 super for a while ?