Liqui-Moly Engine Flush review - fixing Porsche P0024 error code
I bought my 2015 Porsche Macan in January 2024. It had done about 87,000km, and was serviced in line with Porsche’s recommendations.
I immediately had the car serviced by my independent mechanic.
Everything went great until about 7 months later when the engine developed some hesitation.
When pulling away from a stop, there was a juddering. I knew it wasn’t the transfer case (a common fault with Macans) as it had been replaced already by the previous owner.
In addition, occasionally when stopped the idle revs would drop and the car would shudder like the engine was about to stall.
This continued for a few weeks, coming and going. I couldn’t discern any pattern. Eventually the car popped up with a warning.
Engine control fault. Consult a garage. Driving permitted.
I took the car to my mechanic and they read the error code P0024 - Exhaust ‘B’ Camshaft Position - Timing Over-Advanced (Bank 2).
They experimented with swapping the solenoids over on bank 2 (passenger side) to see if the problem followed, but it did not, the problem remained on exhaust cam bank 2.
Next they wanted to swap the camshaft oil control valves over, but this required a special tool, and was difficult to access. So they recommended I take the car to the Porsche dealer.
I was nervous about doing this - it can be extremely expensive, and I prefer to work with mechanics I know and trust.
With little choice however, I booked the car in for diagnosis with Porsche, but there was a 4 month wait.
In the meantime, my mechanic also found an error for the thermostat which was stuck open. It did not produce a dash warning.
I had the thermostat replaced, which was luckily covered by warranty as it was an $1800 job.
At this point the car had done about 8,000km since it’s last service. I decided to do an oil change myself, as I think the 15,000km recommended intervals are too long.
As an aside: Porsche charge a whopping $800 for an oil change on my Macan! Considering the oil and filter costs less than $200, I don’t see the value. My mechanic is much more reasonable, but I enjoy doing the work myself and it’s more convenient than taking the car in.
As an experiment I decided to use Liqui-Moly engine flush, which aims to clear out sludge in the engine. I’ve not used any additives before now.
I put the product in and idled the car for 10 mins, then drained and replaced the filter and oil.
The difference afterwards was remarkable. The engine was running much smoother, and the problem with hesitation when setting off, and the rough idle were both fixed.
I was pleasantly surprised, but kept my booking with Porsche just in case.
I travelled another 6500km, and started to notice the occasional hesitation when setting off. It wasn’t bad, but it was there.
This was fortunate in a way, as it was nearly time for my booking with Porsche. I took the car in at 7500km, and braced myself for bad news.
Thankfully, they couldn’t find anything wrong. The P0024 error code had not returned since my mechanic cleared it, and they drove the car with diagnostics connected, and found the camshaft adjustment was all working within normal ranges.
The Porsche tech suspects a sticking camshaft adjuster, which perhaps explains why an engine flush and clean oil resolved the problem.
I’m now a Liqui Moly believer, engine flush probably saved me a few thousand dollars, not to mention the inconvenience of being without my car.
With a clean bill of health from Porsche, I went ahead with another oil change.
This time I decided to switch from Mobil Super 3000 Formula V 5W-30 to Liqui-Moly Leichtlauf High Tech 5W-40.
I contacted Liqui Moly support to ask a few questions, which I’ll share below in case it can help you:
Why did you recommend Leichtlauf over MolyGen?
In your specific case, Leichtlauf High Tech SAE 5W-40 is the premium formula for your vehicle. It was manufactured using the latest high-performance components and offers outstanding quality, the best engine protection and unrivalled performance. Of course, it is factory approved by well-known vehicle manufacturers such as Mercedes-Benz, BMW / Mini, Volkswagen / Audi, thus it is the first choice for your vehicle.
Even though the Molygen New Generation SAE 5W-40 is also a top product that meets the requirements for your vehicle, it does not reach the level of Leichtlauf High Tech SAE 5W-40 in terms of performance and is only the second choice in this particular case.
What additives are suggested for my cars? (Porsche Macan and BMW Z4)
At your next oil change use Engine Flush Plus then keep using every 2nd - 3rd oil change (may be used every oil change) to make sure deposits are removed from inside the engine. Deposits are abrasive and will contribute to additional wear as well as preventing proper oil flow throughout the engine. It will also remove deposits that form at the piston ring area that may contribute to decreased performance and increased oil consumption by preventing proper ring function due to binding in their groves. Overall, a great way to increase engine life and to optimize oil consumption.
Add Cera Tecto fresh motor oil to further increase wear protection and reduce friction. Cera Tec is a high-tech additive formulation that contains two active ingredients for less friction and wear. It has been proven worldwide and protects your engine even under tough operating conditions. For optimal protection, ideally use Cera Tec with every oil change.
Add Engine Oil Resealer to the engine oil, too, to help refresh rubber-based engine seals. Rubber based seals harden and shrink with age and Engine Oil Resealer will prevent or reverse that process. If your engine is consuming oil, it may be because your valve seals are aged and hard. In that case adding Engine Oil Resealer will soften these seals and reduce oil consumption. It will take approximately 600-800 km of driving before the treatment have completed. For prevention we recommend you use Engine Oil Resealer every 30,000 km / 2 years
To maintain the sensitive fuel system of your engine we recommend you using our DIJectron as preventive fuel treatment regularly every around 4000 km. DIJectron is a unique combination of state-of-the-art LIQUI MOLY additives, developed in order to keep clean and protect the sensitive fuel system of modern, direct fuel injected (GDI) engines. By using DIJectron, the risk of an LSPI event caused by deposits on the injectors and in the combustion chamber is significantly reduced. It will further optimize fuel consumption and increase engine efficiency.
Is it safe / recommended to add multiple additives at the same time? Eg: Ceratec and Engine Oil Reseller?
For engine oil additives, there’s no harm in mixing more than one product as long as the total amount of additives doesn’t exceed approximately 10% of the engine oil fill/sump capacity.
I went ahead with my oil change as usual, but ran into a problem.
After I refilled the oil (and Ceratec) I noticed a leak.
On closer inspection, it appeared that the washer had not gone in straight and was not sealing.
You can see the washer protruding from the left side.
The washer came with the Ryco filter, and I noticed that it seemed a bit loose on the bolt. I’d used it fine the last time, but maybe I just got lucky.
I could replace the washer, but doing so would mean draining all the clean oil out, and my oil catch pan was pretty dirty. I’d rather not do that!
My friend Z helped me out with a genius idea. He suggested putting my shop vac in the oil filler, to create a vacuum and prevent the oil leaking out while I changed the washer.
I was surprised this could work, but I trust him, so I dashed down to Repco to grab a new washer. I bought a slightly smaller one, and noted it was different to the one in the Ryco filter kit. The Ryco washer was flat, whereas the crush washer I bought had a donut shape with a seam on one side.
I wrapped my shop vac in rags to fill the gap, and jammed a bit of extra rag around the edges to make a seal.
To my immense relief, this trick worked! The vacuum kept the oil from leaking out of the drain hole, and gave me plenty of time to swap the washer. I torqued it to spec and it was perfect.
The smaller 16mm washer fit better than the 18mm that came with the Ryco too. The washer part number is RSP2054.
Looking at the washer I removed, you can see the groove where the alignment has not been right. I guess I just got lucky last time. I won’t be using these included washers anymore, I’ll buy some proper crush washers.
Lastly, I needed to reset the oil change warning. I didn’t want to spend a lot of money on a scan tool, so I took a chance on an Autel Maxiap AP200 OBD2 bluetooth dongle, because it was half the price of other options.
This worked great, I was able to reset the warning with a few taps, and now my Porsche Macan is happy again. The hesitation is again fixed - I think regular oil changes help a lot with this.
In conclusion, I suspect that my oil became a bit sludgy through a combination of long oil change intervals (15,000km) and a faulty thermostat that was preventing the oil from reaching full operating temperature. This caused error P0024 and rough idle and hesitation when setting off.
If you want to do your own oil change, you just need some basic tools -
- Car ramps
- Power drill with torx attachment
- Torque wrench with large torx sockets
- Universal oil housing tool, or a socket driver for your specific car
- Oil catch pan and some old bottles to dispose the oil
- Shop rags & workshop degreaser spray
- Funnel for filling and disposing of oil
All up, it costs maybe $250 to get these tools. I suggest watching this video that outlines the process really well:
Happy wrenching!
Cloudy day won't keep me away
Proud member of the dull men's club
My Facebook algorithm started showing me posts from a ‘dull men’s club’.
(Yes, I am still fighting myself to completely remove Facebook from my life)
These posts are long winded descriptions of some (non-)achievement, musings, or questions.
I recall one where a man installed a number of garden lights in his driveway. These lights would eventually fail due to water ingress caused by the cold. Over the passage of years, he’s now stockpiled every individual component of the lights, and can rebuild them in their entirety. This brought him such satisfaction he shared it online.
Despite the ‘dull’ topic, this post was shared and liked by hundreds of thousands of others.
I think it resonates with people because most of us have fairly dull lives, and we see ourselves reflected in these posts.
I grew up in a household where extraordinary was expected. In my formative years my parents ran a business that was very successful, but only briefly so.
At the time, this success was attributed to their hard work and smarts - and that certainly helped.
Absent though was an appreciation of luck.
I use the term luck because it’s a combination of unquantifiable things like timing, connections, access, and so on.
My parents may believe that they are wholly responsible for their success, that all their prior decisions led to this culmination, but life isn’t like that.
We can’t see what is ahead, we can only make course corrections with the information that is available.
My parents could just as likely have sailed past the treasure island, or had their ship sink entirely, if not for the butterfly-effect sequence of events that occurred.
You cannot manifest your life dream into reality, no matter what the self-help gurus tell you. There’s too much outside your locus of control.
The best you can do is point your ship in the right direction and hope you’ll get close, and not deride those who fail - it was probably not their fault.
This is why it’s important to celebrate the dull achievement. Not everyone is going to climb a mountain, or cure a disease, or win a medal.
In fact, if the world was a movie, statistically most of us aren’t even extras - we’re bystanders or punters at best.
In the boot of my Macan, I have a mini fridge. It runs off the car socket, but it also has a battery so it can keep running even when the car is off.
Problem is, the fridge would not last as long on battery as I was expecting. I’d drive around for two or three hours and the battery would still drain, seemingly not using the 12v from the car.
The battery is lithium, and I noticed that sometimes after removing it would be quite warm. If I put it on charge, it would refuse until it cooled down.
The battery sits right above the compressor, so I theorised that it was heating the battery, which prevented it from being recharged while the car was running.
The fridge has cooling vents around the compressor but no active fan. In the boot there’s a fair bit of space but no air movement.
I bought a cheap USB computer fan off Amazon and squeezed it between the cooling vents and the back seat. I plugged it into a USB 12v in the boot using a double socket adaptor.
Since doing this, the battery stays nice and cool, and recharges while the car is running.
The fan moves just enough air that the compressor and battery don’t get heat soaked.
Before, I’d be lucky to get a few hours from the fridge. Now I can be out the whole day and the battery still has half charge.
I’m also able to run the fridge in its ‘max’ cooling setting, rather than ‘eco’ like before. It gets colder faster.
Quite dull, but I use it almost daily to take drinks and lunch for myself and Mr P out every day, so it makes me happy.
Running an errand
Where I do most of my writing
Blink and you'll miss it
When I was growing up, my parents would always be focused on the past, or the future.
“Things were great back when …” or, “Won’t it be great when …”
As a result, they were either depressed that life used to be better, or frustrated that they hadn’t reached their goals yet.
Sometimes they’d be inspired and excited by the future potential, but as they have aged it’s been harder for them to access. They believe their best days are behind them.
My dad continually moves forward and never stops. He’s always chasing, or more likely, running away - perhaps he’s afraid of what he may find if he lingers.
My mum wallows in self-inflicted misery, trying desperately to return to how things were.
For the last 15 years, it felt to me that the world was fairly static. I could take my time in one area of life, and when I returned to another, things would be the same. I didn’t feel like there was anything I was missing out on or losing.
Now, with Mr P, everything is different. Watching him grow is like seeing a star explode. A white-hot burning flare, and then it’s gone.
Flash, and he’s crawling.
Flash, he doesn’t need me to hold his head up anymore.
Another flash, and he says ‘mum.’
Flash, flash — trying food for the first time, walking. They’re getting faster.
I can’t go back. He will never try sushi rice for the first time again. But I was there when he did, and it was fantastic.
I am so grateful to be witness to this, rather than stuck in an office while life whirls past my window.
I wish my parents could access the joy that is abundant in their lives, rather than focusing on what they think they don’t have.
All the twinkling treasure right in front of them, yet they cannot see it - their eyes glued to the horizon.