1975 Ford Capri : 493.000 Km ( 306k miles ) on original drivetrain except engine, replaced in 1991, current engine has about 90-100k miles, 2nd car, in regular use but not daily driver.
Rest of the drivetrain is original and has never been overhauled, only fluid changes.
Always been run on 20w50 conventional, 10W-40 Synthetic blends, Mobil 1 a few times early in the car's life.
Oil pressure good and burns no oil since changing the valve stem seals in Aug '16.
1999 Peuegot 106 1.1i : 178.000 Km ( 108k miles ), owned since April 2014, cheap daily driver, unknown history, i have run it on 10w40 syn-blends and have been topping up with 20w50 conventional, engine burns a bit of oil.