Interesting perspective. I don't own an M157 at all, but I have a couple of friends who noticed a few positive changes after unplugging the solenoid. Not sure if they are imagining it, but they claim that the car felt smoother in start/stop situations, and seemed to feel better overall. I suppose it makes sense if the car is running at "normal" higher oil pressure. Would be interesting to know if the active solenoid is one source of cylinder scoring in M278 and M157.
This guy says unplugging a solenoid in a cold climate where you have a lot of cold starts in winter will ruin the oil pressure pump prematurely and total the engine. So if your friends live is such places probably it is a good idea to plug it back in.
You mentioned it’s extremely rare for the solenoid to be stuck in the low pressure position. What’s the best way to confirm it is stuck in the closed position with out removing the solenoid? Measure oil pressure? M157 S63 Coupe
The solenoid doesn't cause high pressure, it causes low pressure. With the solenoid disabled, the pump is pumping NORMAL pressure, which must be how it was engineered to perform from the beginning. It is well documented that the ONLY reason for the low pressure is to maximize gas mileage. If there were no federal mandates to have a fleet average mileage that increases every year, I suspect we wouldn't be having this conversation. Mercedes own XENTRY TIPS publication (LI07.70-P-070763) states that the solenoid is a non-essential part, to ignore the DTC (P06DA00), the CEL will not be illuminated, and the vehicle continues to operate as designed. It can't be much clearer than that that disabling this solenoid is HARMLESS.
Yeap, i agree with you the only thing that i can't be sure about it's the "harmless", like i said i don't have data/reference because i never unplug it. Keep in mind that after 200k km with the solenoid plugged the front aluminium cover and rear magnesium housing of the oil pump showing signs of wear, at 300k km usually it's a must to replace the oil pump. Once again i don't know what kind of wear will have the oil pump by unplugging the solenoid. My question is very simple, why should I unplug it since i never had a problem? Why should i add this variable to the equation? The single solenoid failure of the M159 it doesn't count for me at least because it was an M159 and totally different solenoid than the M157 plus the M159 had twin turbo setup, by far not stock.
@@TasosMoschatos Maybe no wear! 😀 The "harmless" comment was because it is illogical that failure of the solenoid (via a broken wiring harness in the oil pan) would harm the pump and Mercedes says to ignore the DTC. While the XENTRY TIPS document calls out only the M274 engine (perhaps because of the plethora of broken wiring harnesses), other Mercedes engines use the same solenoid, arguably for the same reason. (The M159 is the exception. It uses a different part number for the solenoid and calls it a "Shift Valve", I believe.) Anecdotally, folks who have disconnected the solenoid have experienced improved performance whether they have a tuned car or not. On my stock 2014 C350 with a normally aspirated 3.5 liter M276 engine, the difference was immediate with regards to engine responsiveness. I thought I had put the car in Sport mode while it was still in E.
Happy new year tasos. I am asking for an advice if your familyer with prolube oil treatment and see if it's better then ceratec in friction. Thx for every thing your a super pro
I agree with you. AMG designed the M157 and we have no idea why the solenoid lowers pressure however, AMG engines (especially the M157) are renowned for their performance. Whoever bought an AMG did so because it’s powered by an engine designed by AMG so, why second guess AMG because of something someone said on the internet? Makes no sense to me. BTW, I drive a 2017 black/porcelain SL63 with night pack and cooled seats. Mileage
Install block heater and unplug the thing!! I kid,I kid! I appreciate your process, top notch. If I’m ever in the UAE I’m gonna look you up.
Well it's a interesting topic, but to be safe I'm plugging it back in. Happy New Year 2024.
Interesting perspective. I don't own an M157 at all, but I have a couple of friends who noticed a few positive changes after unplugging the solenoid. Not sure if they are imagining it, but they claim that the car felt smoother in start/stop situations, and seemed to feel better overall. I suppose it makes sense if the car is running at "normal" higher oil pressure. Would be interesting to know if the active solenoid is one source of cylinder scoring in M278 and M157.
This guy says unplugging a solenoid in a cold climate where you have a lot of cold starts in winter will ruin the oil pressure pump prematurely and total the engine. So if your friends live is such places probably it is a good idea to plug it back in.
@@nemodemo420 Southern California, so probably not a concern here. Good to note though
You mentioned it’s extremely rare for the solenoid to be stuck in the low pressure position. What’s the best way to confirm it is stuck in the closed position with out removing the solenoid? Measure oil pressure? M157 S63 Coupe
probably to install an oil pressure gauge but I cant find any shop that knows how to install an aftermarket one
The solenoid doesn't cause high pressure, it causes low pressure. With the solenoid disabled, the pump is pumping NORMAL pressure, which must be how it was engineered to perform from the beginning. It is well documented that the ONLY reason for the low pressure is to maximize gas mileage. If there were no federal mandates to have a fleet average mileage that increases every year, I suspect we wouldn't be having this conversation. Mercedes own XENTRY TIPS publication (LI07.70-P-070763) states that the solenoid is a non-essential part, to ignore the DTC (P06DA00), the CEL will not be illuminated, and the vehicle continues to operate as designed. It can't be much clearer than that that disabling this solenoid is HARMLESS.
Yeap, i agree with you the only thing that i can't be sure about it's the "harmless", like i said i don't have data/reference because i never unplug it.
Keep in mind that after 200k km with the solenoid plugged the front aluminium cover and rear magnesium housing of the oil pump showing signs of wear, at 300k km usually it's a must to replace the oil pump.
Once again i don't know what kind of wear will have the oil pump by unplugging the solenoid.
My question is very simple, why should I unplug it since i never had a problem?
Why should i add this variable to the equation?
The single solenoid failure of the M159 it doesn't count for me at least because it was an M159 and totally different solenoid than the M157 plus the M159 had twin turbo setup, by far not stock.
@@TasosMoschatos Maybe no wear! 😀 The "harmless" comment was because it is illogical that failure of the solenoid (via a broken wiring harness in the oil pan) would harm the pump and Mercedes says to ignore the DTC. While the XENTRY TIPS document calls out only the M274 engine (perhaps because of the plethora of broken wiring harnesses), other Mercedes engines use the same solenoid, arguably for the same reason. (The M159 is the exception. It uses a different part number for the solenoid and calls it a "Shift Valve", I believe.)
Anecdotally, folks who have disconnected the solenoid have experienced improved performance whether they have a tuned car or not. On my stock 2014 C350 with a normally aspirated 3.5 liter M276 engine, the difference was immediate with regards to engine responsiveness. I thought I had put the car in Sport mode while it was still in E.
Tasos, can you do a video on how to replace an oil pump on M157?
@@amber300c pull the engine out of the car
@@hoanghuynh6571 can you not change the oil pump without pulling the engine out and work from underneath?
Happy new year tasos. I am asking for an advice if your familyer with prolube oil treatment and see if it's better then ceratec in friction. Thx for every thing your a super pro
Happy new year Tasos
~~^^
Happy new year to you too!
thats it
I agree with you. AMG designed the M157 and we have no idea why the solenoid lowers pressure however, AMG engines (especially the M157) are renowned for their performance. Whoever bought an AMG did so because it’s powered by an engine designed by AMG so, why second guess AMG because of something someone said on the internet? Makes no sense to me.
BTW, I drive a 2017 black/porcelain SL63 with night pack and cooled seats. Mileage