I would like to thank all of you guys for your helpful responses. The consensus seems to be that 1HZ motors go a million Ks, wear slowly if you change oil every 5Ks, use genuine filters at least every second time, and use heavy diesel engine oil. The universal experience, including the views of...
This may trigger a new debate but, I change oil every 5000Ks, as recommended by the manufacturer. Everybody tells me the recommendation for today is 10,000 but, call me cynical, I believe the rationale is, wear out your motor faster and be forced to buy a new one.
If this is a HZJ75 or similar, remove the top wiper arm cavity panel and leaf traps, remove the four bolts on the motor, ease it away from the cavity gently and undo the nut and split washer (No 11 spanner). Get a sst separator to split the motor rotor driver from the wiper arm assembly. You...