1996 mazda b4000 4x4. 4.oL OHV. 191,1xx miles. Mostly freeway. Runs fine, no valvetrain noise and has plenty of power.
Replaced every freakin' component of the cooling system trying to find a problem. Can run in Californian 112 degree heat towing up a hill and the needle never leaves "normal". Couldnt be done before the cooling fixes.
Running 10-30w valveoline synthetic oil. and fram extended guard filters...every 4K miles.
Transmission is original. shifts strong, never "sticks" in a gear. Oil is changed every 20,000.
Ill say I have had extrordinary luck with my truck and expect 250,000-300,000 miles out of the current motor. After that some type of motor swap and turbo will occupy the engine bay. or possibly a diesel.
Still holding my breath tho...anything can happen. time is of the essence