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I can hardly believe the difference in my '88 740 Turbo! I notice better throttle response across the power band and fuel mileage has gone up by 3 mpg!
What did I do? I flushed out the cooling system and replaced the nasty brown crap in there with a fresh 50/50 blend of dex-cool and distilled water. I suppose that since the core temp is lower, and the turbo temp is lower, the engine is getting a more highly compressed air charge and so more power. At any rate, the difference is remarkable and the most power per dollar I've found.
sd
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