AIRCRAFT SECTION - 1950s Luscombe that you have put 17.5 hours on in the past 10 years? Should you let the mechanic change your oil?

Aside from what others  have  said (oil should be  changed annually regardless of hours flown), changing  the oil, cleaning the screens, and looking at the condition of the drained oil is part of an annual inspection.

But the engine in a plane that has flown 17.5 hours in 10 years is probably  toast, anyway.

Either you're a troll or the aircraft owner is too old and lost his proverbial marbles. 

Oil is not meant to stay in any engine for 10 years, especially an aviation engine!! 

Contact points in magnetos could likely corrode in that long of time from non-use.  I'd be afraid to fly that aircraft.

I can’t believe anyone would risk their live for the price of an oil change.

I would change the oil in a car yearly, regardless of wether the mileage limit has been reached, I would assume you do the same with a plane ( but with flying hours).

TOTAL BS. Oil absorbs moisture, combines with products of combustion that are in the oil and that can lead to acid etching and pitting of some components such as cam lobes, lifter faces and bearings. The oil should be changed at least annually, if not every six months, even if there is very little flying.

I have heard that oil sitting in an engine goes bad just sitting there after a couple of years.  

After 10 years, the oil is NOT good anymore.  On an airplane, you do NOT take chances.

Oil changes are not only required for miles but also time elapsed.