E-Performance Engine Break-in Question
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2025 AMG G 63 SUV /// 2025 AMG GT 63 S E Performance 4 Door Coupé
E-Performance Engine Break-in Question
Hello I’ve posted the same question with different wording in the C192 forum, apologies. I’m trying to reach the broadest audience possible, and there seems to be way more C63SE owners.
The question is regarding E-Performance models and the optimal way to run-in or break-in the engine. I know how to run-in an engine. There’s even window stickers with instructions on most AMG models. However, the E-P models have the same sticker, and there’s no specific info in the manual for E-P models…so I’ve been told.
With that being said, my concern is that the E-P models start in full electric while in comfort mode. It's recommended that during run-in you leave the car in comfort. While in comfort the car automatically starts in electric and also constantly turns the engine off and on during regular driving for fuel efficiency. Wouldn't this be bad, having the engine constantly turning off and on during the run-in period, especially while under load not just at a stop?
To my knowledge the only way to have the engine stay on is to have the car in sport mode which is not recommended due to holding gears in higher RPM. Another way is to have it in battery hold which means the battery pack wound be at 100% during the entire run-in, not good for Li-ion from what I’ve read.
Does anyone have experience with running-in an E-P model? What steps did you take? What advice or instructions were you given? Hoping someone here has some info or experience to help me out. Thank you!!
The question is regarding E-Performance models and the optimal way to run-in or break-in the engine. I know how to run-in an engine. There’s even window stickers with instructions on most AMG models. However, the E-P models have the same sticker, and there’s no specific info in the manual for E-P models…so I’ve been told.
With that being said, my concern is that the E-P models start in full electric while in comfort mode. It's recommended that during run-in you leave the car in comfort. While in comfort the car automatically starts in electric and also constantly turns the engine off and on during regular driving for fuel efficiency. Wouldn't this be bad, having the engine constantly turning off and on during the run-in period, especially while under load not just at a stop?
To my knowledge the only way to have the engine stay on is to have the car in sport mode which is not recommended due to holding gears in higher RPM. Another way is to have it in battery hold which means the battery pack wound be at 100% during the entire run-in, not good for Li-ion from what I’ve read.
Does anyone have experience with running-in an E-P model? What steps did you take? What advice or instructions were you given? Hoping someone here has some info or experience to help me out. Thank you!!
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As far as I know AMG motors has always been run-in at the factory before going into the car.
I don’t think it matters much as long as you are not wot when the engine is cold.
I don’t think it matters much as long as you are not wot when the engine is cold.
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2025 AMG G 63 SUV /// 2025 AMG GT 63 S E Performance 4 Door Coupé
That’s kinda my issue. Definitely won’t be doing WOT, but the engine will be called upon while cold because it drives in electric mode first. It’s not like I can warm it up first.
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I am not sure who is actually right but here is another opinion: https://mbworld.org/forums/amg-gt-gt...ml#post9134572
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Some bloke on Reddit with an S63E says he starts the car, waits for it to do all its system checks and what not, then puts it in sport mode so the engine turns on, waits for the coolant and oil temp to rise, then puts it back in comfort and goes on his way. Having 9litres/9.5quarts of engine oil raise to operating temp at idle would take ages. That brings up an entirely different issue…really shouldn’t be idling that long in the first place right?
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Block heater would help with the coolant temps, but imagine the hassle, I’d drive off one day with it still plugged in
Some bloke on Reddit with an S63E says he starts the car, waits for it to do all its system checks and what not, then puts it in sport mode so the engine turns on, waits for the coolant and oil temp to rise, then puts it back in comfort and goes on his way. Having 9litres/9.5quarts of engine oil raise to operating temp at idle would take ages. That brings up an entirely different issue…really shouldn’t be idling that long in the first place right?
Some bloke on Reddit with an S63E says he starts the car, waits for it to do all its system checks and what not, then puts it in sport mode so the engine turns on, waits for the coolant and oil temp to rise, then puts it back in comfort and goes on his way. Having 9litres/9.5quarts of engine oil raise to operating temp at idle would take ages. That brings up an entirely different issue…really shouldn’t be idling that long in the first place right?
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OP posted this same question in the AMG Private Lounge, so already gave my thoughts there, but this is incorrect. AMG doesn't run-in the engines at the factory. I was at the factory observing the engine building process myself. They don't even fire up the engine. They have a cold test rig. The engine gets filled with oil, then hooked up to the rig and an electric motor connected to the crank externally revs the engine to about 3000 rpm and then a series of tests check if all the sensors and the electronics are working, but there's never an ignition. If the engine passes all the tests it goes on a shelf and is then delivered to the production line within a 4 hour window of going into the actual car. It's not fired up until the very end of the production when the car is driven off the production line and then it gets shipped straight to its final destination. I talked about this with the tour guide. I asked them why AMG doesn't run-in the engines, and they specifically said that they want to leave this experience to the customer, let them be part of the process.
Last edited by superswiss; Apr 1, 2025 at 12:24 PM.
Thread Starter
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From: Toronto
2025 AMG G 63 SUV /// 2025 AMG GT 63 S E Performance 4 Door Coupé
MBworld Guru
Joined: Apr 2002
Posts: 22,058
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From: Diamond Bar, CA
W206 PHEV AMG
OP posted this same question in the AMG Private Lounge, so already gave my thoughts there, but this is incorrect. AMG doesn't run-in the engines at the factory. I was at the factory observing the engine building process myself. They don't even fire up the engine. They have a cold test rig. The engine gets filled with oil, then hooked up to the rig and an electric motor connected to the crank externally revs the engine to about 3000 rpm and then a series of tests check if all the sensors and the electronics are working, but there's never an ignition. If the engine passes all the tests it goes on a shelf and is then delivered to the production line within a 4 hour window of going into the actual car. It's not fired up until the very end of the production when the car is driven off the production line and then it gets shipped straight to its final destination. I talked about this with the tour guide. I asked them why AMG doesn't run-in the engines, and they specifically said that they want to leave this experience to the customer, let them be part of the process.
Last edited by FrankW; Apr 2, 2025 at 12:36 PM.
