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Discussion Starter · #1 ·
My "new to me" M5 was at the shop for T-Stat repair before I purchase it. The engine bay is far from clean and especially has coolant residue on some of the hoses.
I would like to clean the engine bat so I can easily detect any new leaks or issues.

I am looking for Safe but readily available engine cleaner, but I would like to ask the experts if cleaning/washing engines is even safe to begin with?
Is there an alternative to "washing"?
 

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Quick Engine Cleaning
· Mix up some ONR (QD strength i.e. 8 oz per gallon) in a spray bottle or a garden pest pump spray
· You’ll need a few small brushes and old terry cloth towels.
· Use a pre-cleaner solution, 10:1 distilled hot water/ P21S® Total Auto Wash
· Spray the engine and let the solution remain in place for a few minutes.
· Agitate with brushes to loosen road dirt, oil and grime as needed.
· Re-spray with ONR solution, then wipe dry.
· Start engine and let it run until completely dry.
· Use Iz einszett Gummipflege or CD-2 for all hoses etc.
Note - Do not direct spray to any sensitive electrical components (see“Protection of Electrical Components for details)
 

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Use Gunk Engine Degreaser. Works brilliantly!
 

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A bit late, but I've heard you should cover your headlamps from getting wet because of it's electrical components.
 

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+1 for Scrubbing Bubble. Just tested it this weekend on my wife's CX9 and my daily driver 540/i6 and it came out great without the chemical smell that usually lingers around for week after using a traditional engine degreaser
 
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