I cut down to 1/4 bottle per tank, and it simply wasn't enough-motor began to run just a bit louder. I threw in another 1/4 bottle, and all's relatively quiet again. So, going forward it gets 1/2 bottle per 17 gal. tank.

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"If God had meant for us to walk, why did he give us feet that fit car pedals?" Sir Sterling Moss

Michael
2014 E63S Estate
2006 SLK55
1995 E500
1986 Porsche 944 turbo