Your dads mechanic is a typical domestic type, What makes a race engine not last long are the race components, like forged pistons and Ti valve springs etc, very strong but very short lived. The K24A2 has no race components stock, it should run for a good long time, but add forged pistons and the lifespan goes to shit, pampered 20-30K max before symptoms of piston skirt wear arise..
Change out your trans mtf every other oil change, sure it may still look nice and clean, but there are no combustion byproducts contaminating the oil, but it is still being degraded on the gears. Transmissions wear down oil quickly.
Personally toss the nos
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