Store the sealing ring: When opening the sampling nozzle, the sealing ring may get lost when the safety cap is unscrewed. It must remain on the nozzle.

Avoid air bubbles: Removal should be take place using a device that features an inspection window. This ensures any air bubbles are detected. Air bubbles falsify the oil sample. This device is first screwed onto the nozzle.

Close: After filling the bottle, make sure it is sealed airtight using the screw cap. The bottle needs to be filled to the brim with oil so that no air remains in the bottle neck. After sealing, the bottle can be cleaned, packed and the excess oil can be disposed of.

Flushing: A hose is attached and the oil is removed until no more air bubbles appear. Flushing the hose with one to two litres of oil is usually sufficient.

Taking samples: For the actual sampling, the hose connected to the sampling nozzle should reach to the bottom of the sample container. The bottle is slowly filled to avoid bubbles until it overflows. Up to 50 % of the bottle's contents may overflow. This produces a homogeneous sample without gas pockets. The overflowing oil needs to be collected, e.g. in a bucket, and disposed of properly.