Diesel 428i

basiluf · 08-23-2016, 08:32 AM

Long story short, my old man drives a diesel Mercedes. Yesterday he drove my mom's 428i. He stopped at the gas station to fill up, and got slightly confused and filled the car up with diesel. He drove a few miles before the cat started experiencing problems. It was an older station so for some reason the nozzle fit in the car. Local dealer wants $4k + in repairs. Reading online it looks like most charge around $500 to flush the engine. I think dealer, which I absolutely hate, is trying to take advantage of my old man. Since this isn't a warranty repair, what should he do with the car?

PS- This is all the info I have about what repairs need to be done.

GuitarMike · 08-23-2016, 08:43 AM

Do the flush on your own as it's owners mistake.
Too bad he took it to the dealership as they may flag it.

floydarogers · 08-23-2016, 11:09 AM

Quote:

Originally Posted by basiluf

Long story short, my old man drives a diesel Mercedes. Yesterday he drove my mom's 428i. He stopped at the gas station to fill up, and got slightly confused and filled the car up with diesel. He drove a few miles before the cat started experiencing problems. It was an older station so for some reason the nozzle fit in the car. Local dealer wants $4k + in repairs. Reading online it looks like most charge around $500 to flush the engine. I think dealer, which I absolutely hate, is trying to take advantage of my old man. Since this isn't a warranty repair, what should he do with the car?

PS- This is all the info I have about what repairs need to be done.

On a diesel-into-gas error, all that should be needed is to drain the tanks (itself a hard job as you might need to pull them), re-fill with gas (petrol) and run it a bit to flush the remaining diesel through the fuel system. Of course, you can go all fancy and remove the injectors and flush the fuel rail, or flush the fuel lines through the return line.

Shouldn't be any lasting damage in any case.

(Gas into diesel is another story altogether.

)

basiluf · 08-23-2016, 12:24 PM

The dealership said you can not flush the system because tanks and pumps are one piece on this engine. Is this true?

floydarogers · 08-23-2016, 05:42 PM

I'd probably also change the spark plugs at some point...

On the flushing thing: I don't know what they're thinking... IMO there's no reason to replace either HPFP or LPFP or tanks - just run the system and it'll flush the lines back into the tank and dilute the remaining diesel in those lines to inconsequential levels.

08-23-2016, 08:32 AM	#1
basiluf Lieutenant 77 Rep 408 Posts Drives: 2019 S450 2018 S90 Join Date: Mar 2011 Location: DTLA iTrader: (0)	Diesel 428i Long story short, my old man drives a diesel Mercedes. Yesterday he drove my mom's 428i. He stopped at the gas station to fill up, and got slightly confused and filled the car up with diesel. He drove a few miles before the cat started experiencing problems. It was an older station so for some reason the nozzle fit in the car. Local dealer wants $4k + in repairs. Reading online it looks like most charge around $500 to flush the engine. I think dealer, which I absolutely hate, is trying to take advantage of my old man. Since this isn't a warranty repair, what should he do with the car? PS- This is all the info I have about what repairs need to be done. __________________ '14 M235i(current)ED '11 E93 M3(past)ED '08 E90 328i(past)Local
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08-23-2016, 08:43 AM	#2
GuitarMike Private 47 Rep 67 Posts Drives: F36 2015 Join Date: Oct 2015 Location: Gdansk iTrader: (0)	Do the flush on your own as it's owners mistake. Too bad he took it to the dealership as they may flag it.
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08-23-2016, 12:24 PM	#4
basiluf Lieutenant 77 Rep 408 Posts Drives: 2019 S450 2018 S90 Join Date: Mar 2011 Location: DTLA iTrader: (0)	The dealership said you can not flush the system because tanks and pumps are one piece on this engine. Is this true? __________________ '14 M235i(current)ED '11 E93 M3(past)ED '08 E90 328i(past)Local
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08-23-2016, 05:42 PM	#5
floydarogers Curmudgeon and Pedant 690 Rep 3,489 Posts Drives: 2010 335d, 2014 328d Join Date: Nov 2012 Location: Bellevue, WA iTrader: (0)	I'd probably also change the spark plugs at some point... On the flushing thing: I don't know what they're thinking... IMO there's no reason to replace either HPFP or LPFP or tanks - just run the system and it'll flush the lines back into the tank and dilute the remaining diesel in those lines to inconsequential levels.
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