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Re: 1995 540i needs new Engine Block, what's the d (archive)

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Posted by Keith on November 04, 1999 at 10:17:34:

In Reply to: 1995 540i needs new Engine Block, what's the deal posted by Dave on November 03, 1999 at 21:36:44:

There are a lot of posting about this problem. In short, BMW used a different kind of engine block in the '94 and '95 V8's. Unlike the previous aluminum-silicon alusil blocks used by BMW, such as in the 5 liter V-12, they chose to make the blocks out of an aluminum alloy and coat the cylinder walls with a dispersion coating of Nickel, a combination known as Nikasil. This process had been used successfully in their motorcycles. However, the higher sulphur content of American gasoline etches the nickel dispersion coating, eventually causing the cylinder to lose compression. The reason that it worked in teir motorcycles was because they ran at hotter combustion chamber temperatures, which did not allow the sulphur to collect on the cylinder walls. The new block that will be installed in your car will be made of alusil, which does not have a problem with the sulphur.

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