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If low, add SAE 30W non-detergent oil. AIR COMPRESSOR PUMP: A two stage compressor pump uses two different size cylinders with the intake valve of the second smaller cylinder linked to the exhaust valve of the first larger cylinder. On the down stroke of the large cylinder, air is drawn through the intake valve while the exhaust valve remains closed. On the upstroke, air is compressed, the intake valve closes and compressed air is forced out through the exhaust valve, into the inter cooler and t