Nitro engine fuel can absorb moisture and of course moisture is destructive to the inside of a nitro engine. Coating the internal engine parts in after run oil keeps out moisture and keeps the engine’s components in the best possible condition.

To apply after run oil first remove the glow plug. All that is needed is a few drops of after run oil into the glow plug hole in the top of the engine and a few drops into the air intake of the carburettor. Turn the engine over a few times by hand and replace the glow plug. If the engine is to be left for some time then it is worth making sure that the exhaust and air intake holes are blocked to keep out moisture and dirt.

After run oil can be purchased from a local model shop or on line retailer.