For the oil, just stick to 10w-30. Dead on with the spark plugs and thermostat. As for the supercharger, the snout is powder coated and the housing is not. That's why it looks newer. To change the supercharger oil you remove the fill plug, suck the oil out, put a little less than 2 bottles of GM supercharger oil in and plug it up. It's full when it comes to the bottom of the threads of the plug.