Alusil

Alusil as a hypereutectic aluminium-silicon alloy (AlSi17Cu4Mg) contains approximately 70% aluminium and 30% silicon. This alloy was created in 1927 by Schweizer & Fehrenbach of Baden-Baden Germany and further developed by Kolbenschmidt.

The Alusil aluminium alloy is commonly used to make linerless aluminium alloy engine blocks. Alusil, when etched, will expose a very hard silicon precipitate. The silicon surface is porous enough to hold oil, and is an excellent bearing surface. BMW switched from Nikasil-coated cylinder walls to Alusil in 1996 to eliminate the corrosion problems caused through the use of petrol/gasoline containing sulfur.

Engines using Alusil include:
 * Audi 2.4 V6
 * Audi 3.2 FSI V6
 * Audi 4.2 FSI V8
 * Audi 5.2 FSI V10
 * Audi/Volkswagen 6.0 W12
 * BMW N52 I6
 * BMW M62 V8
 * BMW N62 V8
 * BMW V12
 * Porsche 928 V8
 * Porsche 924S I4
 * Porsche 944 I4
 * Porsche 968 I4
 * Porsche Cayenne V8