Lead in gasoline acted as a lubricant between valves and valve seats. Modern unleaded gas/ethanol blends are very dry, with virtually no lubricating properties. Exhaust valve seat recession can result, a condition where valve and seat materials adhere to and erode each other, with the valve migrating up into the head. As this occurs, valve stem to rocker tip clearance is reduced. If this clearance reduces to zero, the valve no longer closes, resulting in a burned valve. This means compression and power loss, and ultimately a valve job and head replacement.
The Ampco VW top cylinder oiler, with proper lubricant, can reduce or eliminate valve seat recession, adding thousands of extra miles to the life of your engine. The Ampco oiler delivers a mist of oil vapor into the air/fuel mixture, thereby lubricating valve guides, stems, seats, cylinder bores, and compression rings from the hot side - the heat/friction/wear zone. Auxiliary lubrication means reduced friction, leading to a cooler,smoother, and quieter engine.
The Ampco VW kit is supplied with a carb sandwich plate which accepts the oiler nozzle, along with new gaskets, longer carb studs, and nuts. Installation takes about one hour. Recommended lubricant is Marvel Mystery Oil, which can be found at most local auto parts stores.