I've always liked the idea of a Scottoiler, but not the price tag. So I figured I'd build my own. My standard design requirements are: use whatever's in the shed off-the shelf wherever possible easily repairable. The block diagram for the oiler is pretty simple - a reservoir, a valve so it only runs when the bike is on, something to regulate the flow and a delivery system that puts the oil on the chain. Reservoir is easy - I used a large syringe with a small (0.7mm) breather hole so it doesn't form a vacuum. ($5) This is a temporary measure and I'll be fitting a permanent one shortly - probably an aluminium hobby box from an electronics shop. Delivery was straightforward - 3mm copper pipe from a hobby shop ($3) and a scrap of aquarium hose. Flow regulation - an adjustable garden dripper from Bunnings ($1.55) Finally, the valve. This was the tricky bit. I got a small engine vacuum advance unit from the wrecker ($5) and mounted on a backing plate. The actuating arm on the advance is pinned to a 6mm piston, sliding in a cylinder. The piston has two o-rings, and, when retracted, a pair of ports are open to one another and oil flows. The advance unit is plumbed into the intake manifold on an existing vacuum port. When the engine runs, the advance unit pulls the piston, opening the valve. I machined the piston and cylinder in about an hour - I did them on a lathe but they could be done with a power drill without too much trouble. The system now delivers a drop of chainsaw chain bar oil ($7/litre) every 45sec. Chain is moist, no oil on the tyre. Other expenses were some 4mm "beverage line" from the home brewing shop ($2) and a few bits of brass salvaged from my scaps bin There you go. It isn't an example of fine aesthetics, but it works and it was cheap - oiled chain for under $25. Introducing the 'It's not a ScottOiler" ( or 'SnotOiler' for short ).