- Clean the sampling point to avoid impurities.
- Use the blade to shorten the length of the tube in such a way that it corresponds to the distance from the oil surface to the pump (e.g. dipstick length plus 20 cm).
- Ensure that the tube is neither too long nor too short, as this may affect the sampling process.
- Pull the tube straight or fix it using an item such as cable ties to a support (e.g. oil dipstick).
Note: If the screw connection is tightened and the sample bottle is screwed on, but no vacuum is created, the small valve ball is likely to be missing. This may have become lost when the pump was opened during cleaning on a previous occasion. Another reason may be a very forceful tightening of the thumbscrew, which serves to fix the hose.