Engine flush on GLK250
 

I am thinking doing an engine flush on my glk 250 since it m getting close to 160 000km (100 000 miles). Anyone have experience with liqui moly pro engine flush product?

I ordered all the parts that i need for the engine flush form FCPEuro, now i am just debating either flush the engine with new oil or using the existing old oil. Some people said it better to change the oil before the flush, then replace brand new oil after the flush, but that really get expansive, special the diesel engine takes approximately 7.5L oil.

If you have any experience with liqui moly products or engine flush, let me know how it went and did u see significant result or change after the flush.

I wouldn't do it, not recommended by any manufacture. Your engine isn't designed for it, could cause more damage than good. But let us know how it goes.
I would just make sure you use the SPECIFIC oil the diesel was designed for. I pick up the Mobil 1 X1 ESP here in Canada from NAPA.

Im not a fan of his but he makes a few good points:

Why flush? What is it going to really accomplish? Engine is not what's gonna go, it will go for hundreds of thousands of miles with proper basic maintenance. emissions and everything else is another story

Ummm what......


Do the flush. Your engine will thank you.

Also use the Liqui molly ceratec and if you use their oil it will be amazing

Definitely not , do not flush , flush only a toilet !

Any dislodged crud can block the finer oil galleries .

Solvent based ones are the worst and detergent better , but still no .

A LongLife oil has tons of detergents and dispersants so if you want to flush do a short period oil change and repeat .

When a car is new to me I do this , I've only done 4k in the Merc but I've changed the oil & filter twice and the first as as soon as two weeks after I received it but had been serviced , so the oil has been changed 3 times now .

Don’t flush, the sludge you loosen can clog up small openings ,and cause big problems. changing your oil more often won’t hurt, stay with recommend oil.

Has anyone actually used the engine flush?

Ive used the Liqui molly flush on my gl. Ml and 14 q5.
It's been a great product that has noticeably cleaned and quieted the lifters on the ml and gl. No more loud ticking noise.....which is the reason this product is so recommended. It also lowered the idle.
On the q5 this cleaned up noticeable carbon deposits too and now runs much much sooner. The engine is smooth and of you know the 2.0t from vag you know this can be an issue whenr he car gets older.

I then usually drain the oil and add the ceratec which works great.

P.s. The op asked for help with people who have experiences with the engine flush. Not a choir of naysayers.

I've used the LiquiMoly engine flush on my GLK, and on all my diesels in the past with no problems to report. You have an oil sump holding nearly 7 liters of oil. The can of engine flush is 500mL, which gets diluted into the oil. I wouldn't lose sleep over it but then again, you are your own warranty. The instructions say to not rev the engine, just let it idle several minutes and then drain the oil. In this case, I'd do a real drain from under the car instead of my usual topside vacuum extraction. Refill the engine with the proper 229.51 or 229.52 oil and a new filter, you're good to go.

I'd consider an engine flush for any car new to me that has over 25k miles. Especially if you don't know what oil has been used prior to your owning it. But I would NOT do engine flushes regularly. Just once at a certain mileage or milestone (once at 100k seems reasonable) and then just use the appropriate oil and interval. If you do that, there should be no reason to deep clean the engine.

I've always noticed a smoother idle after a flush, along with the new oil staying cleaner a bit longer than usual. As you know, even new diesel oil is black immediately after running the engine. That just means it's doing its job of holding all the soot in suspension that diesel engines produce. Good luck and post back.

lol huh? please explain how "it will be amazing"

Amazing for the repair shop.

The ceratec is a friction modifier that adheres to the internals
The engine oil from liqui molly already has the molybdenum particles as part of its formula.
When these combine they are amazing, as least subjectively when driving. Then objectively when you do an oil test.

When paired with The engine flush, it just gives a nice reset and clean after a long and perhaps overused life.

Again, like mentioned before me, the flush and ceratec shouldn’t be used at every oil change. I think liqui molly recommends somewhere between the 40-60k Cheap insurance regardless.

Not it sure where all the flush and other hate comes from ......I’ve had my mb dealer recommend this as well for diesels and my 450.

Thx for alll the replies:). I just got the package from FCP euro today.

https://cimg5.ibsrv.net/gimg/www.mbw...5961d82383.jpg
https://cimg6.ibsrv.net/gimg/www.mbw...8ed24c0e94.jpg
https://cimg7.ibsrv.net/gimg/www.mbw...0a793a262c.jpg
https://cimg0.ibsrv.net/gimg/www.mbw...74f7401205.jpg
https://cimg1.ibsrv.net/gimg/www.mbw...5735cb0983.jpg
https://cimg4.ibsrv.net/gimg/www.mbw...4f3bac6806.jpg

So do you guys think i should use the old oil to flush or use the brand new oil to flush? i have more than enough oil to do 2 oil changes:) To be honest, i cant wait to try the ceratec additives. Lots of good reviews online.

Goodies!

I would just use dump the engine flush in the current oil that is in the car. 🚗

I will find a time to do this weekend and post a full review before and after. Hopefully it will increase my mileage:)

Have you been doing oil analysis for past few oil changes? If not, there is nothing really to look at before and after.
Doing proper warm up (no idling), driving your car, and changing oil frequently will make your engine outlast everything else on the car.
I would never put any of this stuff in my engine. Has this been really tested? I still struggle to understand what's the benefit. There are videos for 400k mile diesel engines taken apart and looking like new.

Not us mb diesels.

You saying that just shows you do need read up on the multitude of issues with us diesels.

All extra preventive maintenance is needed with those.

No oil analysis. I am not that passion to proof a point to u. I dont know if u ever own a MB diesel before, once the mileage gets high, rough idle is like a common thing during cold start. I am hoping the engine flush will solve the rough idle that i am experiencing.

Because of my work, i don't change my oil until the indicator reminds me. Sometimes i go few thousands km over. With family and work, there are only so much time i can spend to take care my vehicle. So hopefully the engine flush will help me tune the engine up a bit and last little longer.

it won’t.

How do you know? u r not donald trump.

sounds like you have it all figured out, keep pouring pixie dust into your $5000 engine.

Exactly. Why take the manufacturers recommendation when you can rely on pseudo-science?

Sounds like some people are taking pixie dust themselves.