# Travel >> Transportation >> Small Aircraft

How to Use Motor Oil in Aircraft Engines

Aviation engine oil is the lifeblood of an aircraft engine. Engine oil lubricates the engine's moving parts and helps reduce friction. Pilots should use the proper type of engine oil to increase the chances of trouble-free engine operation and continued safe flight. Do not ever use automotive engine oil in an aircraft engine. Aircraft engines are air-cooled and run at different pressures and temperatures than automotive engines. The Federal Aviation Administration, or FAA, does not approve the use of detergents and other automotive additives for use in aircraft engines.

Instructions

- 1
  Document the proper aviation oil. Many engine manufacturers recommend that straight mineral oil be used for the engine break-in. Use ashless dispersant, or AD, oil after the first 25 hours of engine operation. Consult your aircraft's pilot's operating handbook, or POH, for specific instructions.
- 2
  Find the correct oil weight. Engine manufacturers recommend a specific oil weight, or viscosity, for given operational temperatures. Find this information in the aircraft's pilot's operating handbook, or POH. Use of multi-weight oils enables a broader range of operating temperatures.
- 3
  Purchase the aviation engine oil. Buy the oil by the case to realize a lower per-quart price. Pilots often obtain discounts by collectively buying in bulk from a local oil distributor. Purchase enough oil to complete an oil change and to service the engine between oil changes. The POH contains the proper amount of oil needed to fill the aircraft's engine.