man i have similar issues in every two weeks my oil goes from full to half on the dipstick i have done 2 engine rebuilds now fully forged only thing i haven't changed is the head and the pistons from the first rebuild but changed the valve steam seals the first time round changed turbos from tf035 to td04 checked spark plugs and they are good changed PCV vavlve new original toyota oil pump blowing no smoke at all and oil is not leaking anywhere i think i am going to boat ramp it its driving me mad :angry2: :angry2: :angry2:
