(07-03-14, 11:10 PM)Punkstig link Wrote: Used engine oil contains a few nasty things, unfortunately when mixed with water can chemicaly turn acidic, if you're a unicorn rider then it's not so much of a problem to use on the chain, however, not so helpful if you ride in the rain!
Exactly. I've stopped using used engine oil on the bicycle chain long long time ago - it wasn't good. Used engine oil is good for fire and protecting wood on old fences, shacks etc.
(07-03-14, 09:29 PM)Gnasher link Wrote: [quote author=Punkstig link=topic=11984.msg132369#msg132369 date=1394189078]Used engine oil shouldn't really be used on the chain, spoke to my mechanic about this as intended to put my old oil through a coffee filter and use it in oiler but apparently it can be harmful to the rubber O/X rings.Change your machanic he hasn't got a clue what he's talking about![/quote]
He is a MECHANIC, not a chemist. Even if he didn't have any clue about oils, he could still be top notch with repairing/replacing bike parts. Old oil does become more acid like - so not the best thing for rubber.
Most things done in a hurry need to be done again - patiently.