re: recommendations for DEF delete on BMW

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Well...can you elaborate

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Sure. First and foremost, it's illegal. Nothing to do with a vehicle is worth being on the governments naughty list.

2nd - you must rely on the black market to do it. The gizmo to tune the various computers are black market devices. The people to write the program are black market people. They don't have the resources necessary to do proper design and validation on their software. It might be fine, it might not be. You have no way of knowing. Might run great now, might chunk a rod tomorrow. More likely, it'll run fine for a while until various gremlins start to show themselves. The guy who wrote your tune is probably a victim of the EPA by that point and you are now properly fricked.

3rd- alluded to above, you no longer have factory support much of anything to do with that vehicle. Anything that goes wrong electrically, you'll be on your own. Need a new ECM? fricked. BCM needs to go through a calibration because of some new actuator? fricked. All kinds of new ways to be totally fricked and stuck with a massive repair bill.

4th - resale. You basically won't be able to trade it in, you will have a hard time selling it because nobody wants that backyard modified bullshite. If you're actually going to drive it all the way until worthlessness, that doesnt really matter. Few people do that in America.

It’s a 2017, with 160k miles on it. The plan was to use it as a commuter until the wheels fall off. At a crossroads right now. Car value is only around 10-12k, needs new tires and potentially this 5/6k sensor replaced. All signs point to trading it in but the price of new cars, along with interest rates, have us wanting to explore all options before trading it in. Doesn’t help we just paid if off 5/24

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There's no point in going through the bullshite of dealing with deleting a diesel these days. Its far more headache than it's worth and you run the risk of incurring the wrath of the government.

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Simply not true. Now if she is only going to keep the car another year or two... then yes. I deleted my diesel and voila... no more dash lights associated with DEF or emission sensors. 5 position switch with 1 being good mileage and 5 being scalded ape.

I like it so much that my next diesel I might delete it while it is under warranty. Trying to get an appointment for the 1 diesel tech at a dealeship is a nighmare to begin with. Keep the truck for 3 days to change a EGR sensor... No Thank You.

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no mechanical advice at all

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What mechanical advice do you want? Do you know what your fuel table looks like vs what it used to look like? Do you know what the warmup strategy is? The turbo speed with the reduced backpressure? The turbo drive pressure? Peak cylinder pressures? Cylinder temps? Do you know anything at all about what you did to your engine? No. You just know that all that stuff in the exhaust pipe isn't there anymore and the prevailing internet lore is that it's now more reliable than it used to be. There's no point in discussing any of it because even if you did understand it all, you'd have no way of figuring out whats going on inside of there. Nor does the dude who wrote your program. You have no earthly idea if what you did was better than what you already had, you just know it better be because you already convinced yourself it was.

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In my state you won't be on some watch list for deleting an absolutely ridiculous Def system that does nothing but ruin the machines reliability.

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Do you not live in America? Do you have any reliability data for anything, even the small sample size you do have?

I don't care if you believe me or not, and I'm not going to apply effort to convincing you that you should. I'm going to put it out there that it's a bad idea and hopefully get some people to do a little critical thinking before they crawl under their vehicle with a chop saw and a tuner.

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Used to be a BMW fanatic, after briefly owning one I won't feel sorry one but if they go out of business.

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Its a racket.

Lexus is superior

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no mechanical advice at all


What mechanical advice do you want? Do you know what your fuel table looks like vs what it used to look like? Do you know what the warmup strategy is? The turbo speed with the reduced backpressure? The turbo drive pressure? Peak cylinder pressures? Cylinder temps? Do you know anything at all about what you did to your engine? No. You just know that all that stuff in the exhaust pipe isn't there anymore and the prevailing internet lore is that it's now more reliable than it used to be. There's no point in discussing any of it because even if you did understand it all, you'd have no way of figuring out whats going on inside of there. Nor does the dude who wrote your program. You have no earthly idea if what you did was better than what you already had, you just know it better be because you already convinced yourself it was.

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In my state you won't be on some watch list for deleting an absolutely ridiculous Def system that does nothing but ruin the machines reliability.


Do you not live in America? Do you have any reliability data for anything, even the small sample size you do have?

I don't care if you believe me or not, and I'm not going to apply effort to convincing you that you should. I'm going to put it out there that it's a bad idea and hopefully get some people to do a little critical thinking before they crawl under their vehicle with a chop saw and a tuner.

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OP, I've spent a lifetime in this world, both tuner world and major OEM. Listen to DownshiftAndFloorIt. He knows of what he speaks. What you will get yourself into with your vehicle has little or no relevance to the baws posting about tuning & deleting their C2500's, or Cummins, or off-road equipment, for which there is vastly more after(black)market support for than their is for your incredibly niche vehicle. Those posters would be wise to delete these posts right along with their DEF systems, because EPA might just decide to come for them too unless T$ neuters them first.

You said you wanted to drive it until the wheels fell off, well, surprise, they're falling off now for all practical purposes. German makes are NOT "drive it until the wheels fall off" options for the financially wise.

I've done two 4 cylinder cats. Completely stripped all the garbage off of them. No control panels...lcd screens none of it. Back to basics that just work.

Prior to modification it just never ran. Either emissions or one dumb fault code or another. If the pump wasn't absolutely level or a fluid was even 1/4 inch low it wouldn't run.

I've noticed older machines without emissions are now auctioning for more than some of the newer models with emissions.

I'm going to have to continually get more well versed at it. My equipment is used in very remote locations. To get to it I have to ride a technician out in a side by side so reliability is everything.

Thus far I've done busses, trucks, cat pumps and one 25 ton kobelco. Zero issues thus far. It's not as complicated it people would like to make it out to be. Most of these exact same engines are running in other countries without he emissions. Removing them isnt going to implode your diesel engine.

I'd bet money the same bmw engine is used in other countries with no def system.

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Are there any markets globally where these engines don’t come with DEF?

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Not that I know of.

BMW moved away from diesel in the US around 2019 because of regs and low demand. Even finding parts to support the BMW diesel platform is getting a little tricky in the US now that we're 6 years on since they left the market and were sold in low numbers in the first place.

Dieselgate, pretty much killed that market for the Germans.

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Dieselgate, pretty much killed that market for the Germans

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That’s a shame