vitamin New member Dec 11, 2012 #1 What makes it synthetic ? Hasn't polyethelene glycol (dot3,4,5.1) and silicone (dot5) always been synthetic ? They don't sound very close to natural or crude oil'ish to me.
What makes it synthetic ? Hasn't polyethelene glycol (dot3,4,5.1) and silicone (dot5) always been synthetic ? They don't sound very close to natural or crude oil'ish to me.
