I choose to be proactive in keeping carbon deposits in check, 10oz of Lucas Upper Cylinder Lube with every fuel fill up.

This stuff lubes/de-carbons/cushions everything it contacts. Fuel pump, injector pintles & seats, valves (guides, stems & seats), combustion chambers, pistons & rings, cyl walls.....

Over 200k miles and I see over 19 mpg/450 miles per tank city driving the DFW area.

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'03 X5 4.4 Sport, last of the M62s (8-03 build date)
I believe in deadication to craftmanship in a world of mediocrity!