This is exactly I am thinking. We should not need high flow rate unit. The car at most uses 5 gph doing 125 mph ( push it to the limit ) at 25 mpg. Why we need high flow rate? Mine is a small unit, at most 10gph, and is doing fine on my 300SDL and 300D.

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Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed.

W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html

1 X 2006 CDI
1 x 87 300SDL
1 x 87 300D
1 x 87 300TDT wagon
1 x 83 300D
1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry.