The day I bout my pre owned 2007 6.7 the salesman said : "We dont wash / clean the engines anymore becasue of all the computer / electronic components that are used with newer engines. Is this guy full of sh** ?

Mine has some dirt/ dust covering it. And I try and baby these expenive toys and keep them as clean as possible. Especially an expensive Cummins.

If so / or not...Can I take it to a car wash and spray it down with soap and rinse it off thorougly. Or should I just use the High Pressure spray only with no soap.

Can these engines take the old fashion can of De-Greaser ? Or is that a no no.

DubT's Sig:

2007.5 3500 C/C 4x4
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well at work we use the pressure washer to clean the engines (Cummins ISX, ISM, and 8.3) which are all electronic never really had any problems now i wouldnt be putting 5k psi of water right on the ecm and conectors but you should be ok to spray them down with soap and a high pressure hose

stkdram55's Sig:

Just an Inline 6 Cylinder

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No concerns what so ever with washing it...Maybe even a little tire shine to make it all shinny!

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yeah i forgot, i just got done yesterday cleaning two of our trucks for the truck driving championships....spray the crap out of the engine with original armor all and it will look sweet

i spray the crap outta mine every now and then and ive never had any problems

DslDeamon's Sig:

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yeah, dealer was blowing smoke. Only thing I've done before is put a plastic bag over the alternator.

MoeSzyslak's Sig:

07.5 Cummins 6.7L Mega DRW 6A. BF, gauges-Next: Black Maxx
06 duramax c5500
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Washing the engine with steam or a pressure washer is Cummins-recommended procedure. They just tell you to not directly wash the ECM or other electronic components.


They really put a lot of effort in waterproofing all the electronics.

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