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I work for a saab dealership and it is true in fact some people have been blowing engines from severe knock. THIS IS DUE TO USING LESS THAN 91 OCTANE FUEL. We just got a service bulletin from saab about this problem. It is essential that in this high altitude environment you use 91 octane. I personally know several happy viggen owners who have had no problems with their engines. I have an 88 900 S and i use 91 octane and nothing less.
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