Hello BMW owners,

In recent years, experiences in the field have shown a significant increase in various drivability complaints, due to variations in fuel quality offered by different manufactures in the US. In general, the quality of gasoline is determined by many factors, with the percentage of alcohol (mainly ethanol) and the level of detergent additives becoming the key contributors.

Lower levels of detergent quality and quantity may cause harmful carbon deposits to build up on vital engine components like fuel injectors, intake manifold ports and valves, and inside combustion chambers.

The excessive carbon deposits eventually may reduce fuel economy, lower engine performance and may lead to various drivability complaints, e.g., misfire, rough idling and Service Engine Soon lamp illumination.

Symptoms are the following: Knocking; pinging; run-on; poor acceleration; octane requirement increase; increased emissions of NOx; and engine idle speed surges.

Depending on the manufacturer, fuels may contain various additives such as: oxidation and corrosion inhibitors; metal deactivators; emulsifiers; and anti-icing agents and dyes. In addition, they are required to include some form of an intake system deposit control package. Unfortunately, not all fuels are created equal, and some additive packages are not effective enough to maintain the integrity of the intake systems in high performance engines, or engines operating under severe environmental conditions. Even worse, the intake system deposit control additives in some fuels may actually contribute to the combustion chamber deposits accumulation, and to the problems associated with those deposits, i.e., knock, run-on and increased emissions of oxides of nitrogen.

To remedy these complaints, BMW has developed a new cleaner concentrate to clean the fuel injectors, induction system and combustion chamber of harmful deposits. This cleaner is not just poured in the fuel tank. It is administered through the injector rail at a specific pressure while the fuel pump has been disabled.

The fluids described above is the only BMW approved cleaner that can used to clean the fuel injection system, induction system and combustion chamber. Using non-approved fluids or tools can lead to premature component failure.