1986 Toyota pickup, 4 cyl 22R engine, 300,310 miles, original untouched engine. It also has original transmission and original clutch. Rear end is also all original.
Oil from day I bought it to 20,000 miles was Castrol 20W-50 conventional. When Castrol Syntec became available, I switched to Syntec 5W-50. When Mobil 1 15W-50 became available, about 40,000 miles, 1990, I switched to that and have used it ever since. I changed the oil today.
I used the Toyota filter until they switched to the small size filter. I then changed to the big Wix filter.
I use Amsoil gear lube in the manual transmission and rear end and I can't remember how long I have used it, but it has been years. I change oil and filter at 3000 miles, air filter at 6000-12,000 miles, transmission and rear end at 25,000 miles. I change the fuel filter at around 12,000 miles. I use platinum plugs and change them at 25,000 miles.
I think what impresses me most about this truck is that it has the original clutch and I can set the park brake and kill the engine.
It also gets a very good 26-28 MPG.