Oil change questions

As others have stated, use Dow Corning DC-4 (Chief Aircraft supply ). It
makes removing the filter easier than with plain oil. Torque to spec or
3/4 turn past gasket contact when you don't have a wrench (as it says on
the filter). 1 turn seems a bit much, but you can check it with a torque
wrench to see how close it is to spec.

As to the time limit, you are correct. Acids form in the oil that
corrode the insides of the engine. Not sure if the Lycoming spec was 3
or 4 months or something else, but there was a time limit.

Many mechanics are used to changing oil at the request of cheapskate or
neglectful owners. By the time that happens, the oil is usually a year
old and has turned to black sludge. Surprising the mechanic would give
you such a tongue in cheek answer when the engine manufacturers have a
recommended time limit.

Good Luck,
Mike

Jimmy B. wrote:
Well, it was time to change the oil in the old bug smasher. Seeing this
is my first time, I hired a mechanic to walk me through it. Of course
it is pretty straight forward, but a few questions came up.

1) The oil filter specified a torque setting of 16 to 18 ft-lbs. The
mechanic told me mot to do that, just 1 more turn after the gasket
seats. He said that if I used the torque setting, it would be very hard
to get the filter off again.

What do you all do? Torque to the specification, or just 1 turn?

2) A lot of people to change the oil every 3 months regardless of hours
on the oil. Combustion waste gets absorbed by the oil. The mechanic
said he liked that idea because it would generate more revenue for him,
but he felt it was not really necessary.

What is your opinion?

TIA!!!!

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