I've been pressure washing engines for years... You just have to be selective about what you spray.. sensative items are either wrapped in plastic or carefullt avoided. No Ill effects as of yet

Jonathan

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Blue Ridge Mercedes
Jonathan Hodgman
http://www.blueridgemb.com/
Enthusiast Service, Restoration & Tuning.
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Located in the Atlanta area
Specializing in all pre and post merger AMG's including Hammers and DOHC M117 engines.
Mercedes Repair Atlanta