David Kaiser, Head of Research and Development for LIQUI MOLY, shows the new pourers.
David Kaiser, Head of Research and Development for LIQUI MOLY, shows the new pourers.

Using the wrong additive is like giving someone the wrong medicine. This is why LIQUI MOLY adds an additional safeguard to ensure motorists always use the right additive. The new pourers for fuel additives prevent petrol additives from going into diesel tanks and diesel additives from going into petrol tanks. “This provides additional protection from careless errors with expensive consequences,” says David Kaiser, Head of Research and Development with the German oil and additive specialist.

Modern engines are very efficient. The price to pay for this is that they are also very sensitive. Using a diesel additive in a petrol engine or a petrol additive in a diesel engine can have devastating consequences. For its new pourers, LIQUI MOLY uses a protective mechanism that many car manufacturers now install in their vehicles: a flap on the fuel tank opening that does not open until a pipe of the correct size is inserted. 

For this reason, the pourers for LIQUI MOLY additives now have different diameters. The pourer for diesel additives is big enough to open a diesel tank protection flap – but too big for the opening of a petrol tank. In the same way, the flap of a diesel tank stays closed if you try to pour in a petrol additive. “It’s an additional safeguard against mistakenly picking up the wrong additive,” says David Kaiser. 

The new pourers work just as well on cars without a protection flap on the fuel tank, of course. LIQUI MOLY is successfully switching its additive production to the new pourers, so for a while these products will be available with both the old and the new pourers. 

As before, LIQUI MOLY additives also have a color code to help tell them apart: diesel additives have a red lid, petrol additives have a blue lid, oil additives have a black lid and radiator additives have a white lid.


With around 4,000 items, LIQUI MOLY offers a global, uniquely broad range of automotive chemicals: Motor oils and additives, greases and pastes, sprays and car care, glues and sealants. Founded in 1957, LIQUI MOLY develops and produces exclusively in Germany. There it is the undisputed market leader for additives and is repeatedly voted the best oil brand. The company sells its products in more than 120 countries and generated €545 million in sales in 2018.

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