big pistons we have all heard the litany of acid oil claims but have you ever verified the claims?
you have to beware of information "that is common knowledge"
because sadly quite a lot of it is marketing hype / bull****.
I am a pariah.
I test the ph of my oil.
I use phenolphthalein as my ph indicator.
it is available in australia in a soil test kit out of Bunnings (our version of home depot) for about $aus 20.
you need a white surface.
you put a coupe of drops of oil on the white surface then a drop or two of phenolphthalein and smear the two together over the white surface.
you then read off the ph from the colour chart.
normal aircraft oil is ph 7 brand new out of the bottle.
never ever in all of my tests have I found my aircraft engine oil to be acidic.
so I call Bull**** on all the acid oil claims.
my engine was designed for 50 grade oil.
I have used aeroshell W100, Castrol Aviator D100 (the best) and now Phillips AW100 without any problems at all in my O-200.
verify the claims son. most of them are bollocks.
W8