Assembly Lube 4oz Red Line OilRed Line Assembly Lube is designed to be used as a lubricant to apply to potential wear surfaces before assembly in order to prevent metal contact upon startup before adequate lubrication is supplied. This product will mix with the oil and not plug filters, and can be used on all lubricated parts such as cams, followers, pistons, bearings, and bolt threads. Use only a small amount on bearing and piston surfaces too much can make it difficult to turn