Yeah I know it's a real basic question but then I have a real basic knowledge of bikes: A bike mechanic told me that engine oil is one of the best lubri-cunts (sorry, it's the school boy in me:-) for chains because it penetrates deep (oh err missus) so I have be using a 1" paint brush to apply synthetic oil on the chain and it seems to work well and is less messy and cheaper than these spray chain lubes, so the question is; any see any short or long term problems with this? D