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Some years of V8s had serious problem (archive)
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Posted by Lars BendOr e12s on June 02, 2002 at 18:13:01:

In Reply to: 94 530i with V8 vs 90 525 or 535 posted by chuck scholtes on June 01, 2002 at 18:58:38:

I don't know the years, but arm yourself with the info about the V8 problems with the Nicasil lined cylinders. Some these engines were factory replaced and other simply had a warranty extension. The warranty is running out on a lot of the Nicasil motors. The replaced motors used a different alloy treatment in the cylinders... Alumasil, to correct the problem. Turns out we have too much sulfur in our gas for the Nicasil. Most obvious symptom was apparently rough idle, that couldn't be tuned out as the cylinders were starting to fail

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