Engine Cleaning: What to Consider

I've reviewed the discussions in the links below, but additional information would likely be helpful.

The people who replaced my exhaust gas recirculation cooler, just like the inspector during the last vehicle inspection, pointed out that my vehicle has significant oil contamination at the bottom of the engine. (I also have photos from the workshop.) Both recommend an engine cleaning to pinpoint exactly where the oil is leaking from.

Now, the only provider in my (small) town that had an oil separator for engine washes has ceased operations due to age and health reasons. The small hall, which only had one bay, has been taken over by a young man who otherwise only does vehicle cleaning and detailing.

He doesn't seem to be a real expert in car washing, but I don't really have any other options (unless I'm willing to travel further).

I will deal with the oil issue separately (and ask about it here later) - today I'm specifically asking what I need to be aware of when washing the engine (in addition to the tips in the links below) to ensure my vehicle doesn't get damaged. (The vehicle is a Passat B6/3C, manufactured in 2006.)

Should I, for example, disconnect the battery? (The provider only offers top-loading washing machines, not front-loading ones - or would a front-loading machine be much more sensible in this case? Maybe I should look for a professional provider after all?)

I have read these discussions (some of which are already quite old).
/viewtopic.php?t=5676
I'm sorry, but I cannot access external websites or specific files online. Therefore, I am unable to translate the text from the provided URL.
I'm sorry, but I cannot access external websites or specific files online. Therefore, I am unable to translate the text from the provided URL.
/viewtopic.php?t=1019 (only indirectly related to the topic)

Thank you in advance for any tips and suggestions.

Hello,

As long as you don't aim for the connectors, not much can go wrong. The lower motor cover should be removed, and cleaning from above won't be very effective. A cold cleaner or similar product, along with some soaking time, is recommended.

Best regards, Rainer.

Hello.

I just had the engine of my A6 washed this week.
Before reattaching, I disconnected all the connectors and blew out any dust or dirt that might be lodged in the connector seals using compressed air. Before reconnecting, I applied a shot of silicone spray to both ends of each connector to help them slide together smoothly, create a seal, and repel water.

Then go to the gas station with a self-service pressure washer; they all have oil separators there, and it's allowed to use them for that purpose.

I haven't had good experiences with cold cleaners, especially because you end up with the smell of it for a long time, spreading through the interior via the heating system .

I have had very good experiences with "Gut und Günstig."
http://www.frosch.de/Produkte/Putzen/Kuechenreiniger/Grapefruit-Fett-Entferner/
Made. Price: 2 euros per bottle.

Aluminum and plastic parts become perfectly clean and even shine. It dries very well and is also biodegradable.

I keep the motor running because the rotational movement helps to keep water and dirt away from the belt drive/throws it off.

Okay. Turn off the heater fan and close the recirculation vent .

The result was great, no problems. I took another short ride afterwards so everything could dry out from the engine heat.


Regards, Mpire.

Wow, that looks really neat!

Thank you for the feedback so far.

It also encouraged me to explore whether I could potentially do some of it myself. That way, I can proceed with caution (and I would also be responsible for the outcome).

I'll let that sink in for a few days and then decide.

Now, let's start with an oil change and address the problem of the excessively high oil level and the oil leak (see my troubleshooting under https://community.dieselschrauber.org/en/viewtopic.php?p=240437).).

Thank you again for the quick responses.