For Maximum performance and pump efficiency,change the oil after every evacuation. After evacuation,oil contains contaminants which limit pump efficiency. Premium vacuum pump oil can be used in any vacuum pump to maintain and prolong the life of the pump.
Drain immediately after evacuation while pump is warm. Slowly add oil to top of "oil level" line. If oil is to low, you will hear the exhaust baffle chatter. If oil level is too high,excess oil will be blown out of the exhaust.
Non detergent-Extra Pure-Hydroprocessed-ISO 400