I am a former Saab guy who used Techron and the highest octane (92) gas religiously. My turbos always ran real smooth. I had to put 89 octane in on a road trip and the difference was noticeable.

I always use BP and they say there detergent is better than top tier.

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2004 BMW X5 3.0i - Mine
2011 BMW 328i xDrive - Hers
2002 BMW 325xi - waiting for a new owner