Not silicone (a form of plastic), but silicon, an element found in sand and other minerals, thus the dirt that gets past an air filter.

mcneely

---- Timmy Evens <monkey_lips@YAHOO.COM> wrote:
> Quick question: why does poor air filtration result in higher levels of silicone in your oil? Where's this silicone coming from?
>
> Tim
>
> Sent from Yahoo! Mail on Android

--
David McNeely