I have just rebuilt a Toyota LandCruiser engine: 1993 FZJ80, a straight 4.5 liter inline 6. It had 222K when the head gasket went. So, complete top end rebuild, cylinder oversize rebore with new pistons and rings, complete new bearings (all), a complete rebuild ! Only three major components not replaced were crank, rods and cams.
So, I essentially have a new/low mileage engine ?
What diet/maintenace plan should I put this engine on when using Auto RX ? Should I even bother ?
Sounds essentially like a new engine. I might do a bottle to help with passages and machining debris. Otherwise, you could do the maintenance dose, but it can wait a bit. I'd start no later than 25k if you want to avoid a full treatment @ 50-75k
I would wait for about 7K to be achieved on the clock, at that point I would access how well the new motor parts have broken in and how well the new rings have seated with the bores. If you are not completely happy with the break in, especially with compression values, start an auto-rx standard application right away. This has given many new vehicles a second chance at being an optimal motor. Be sure to run conventional oil during the break in period.
