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post #11 of 14 (permalink) Old 01-26-2019, 07:25 AM
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DPFs are a pain in the butt. They're WEAR ITEMS and yes, this means they wear OUT. In passenger vehicles they combine the DPF with the cat, so when it wears out (not if!) you get to buy a new cat that's not broken -- and spend 2-3x as much money as necessary. Oh, and the combined design means you can't clean them mechanically off-vehicle either.

Heavy trucks have the DPF and cat separate. Yeah.

I will not buy a vehicle with one, which means no newer diesel for me -- and this is one of the (many) reasons. DEF is another expensive nightmare when something goes wrong with the urea injection system.

Normally it will regen on its own when on the highway, but if it's failing to do so and you are putting a reasonable amount of highway drive-time on the vehicle the DPF has probably failed, and you won't like the price of having it replaced.
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post #12 of 14 (permalink) Old 01-26-2019, 10:56 AM
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Originally Posted by tickerguy View Post
DPFs are a pain in the butt. They're WEAR ITEMS and yes, this means they wear OUT. In passenger vehicles they combine the DPF with the cat, so when it wears out (not if!) you get to buy a new cat that's not broken -- and spend 2-3x as much money as necessary. Oh, and the combined design means you can't clean them mechanically off-vehicle either.

Heavy trucks have the DPF and cat separate. Yeah.

I will not buy a vehicle with one, which means no newer diesel for me -- and this is one of the (many) reasons. DEF is another expensive nightmare when something goes wrong with the urea injection system.

Normally it will regen on its own when on the highway, but if it's failing to do so and you are putting a reasonable amount of highway drive-time on the vehicle the DPF has probably failed, and you won't like the price of having it replaced.
Wear out items? Then that means that I'll have the "delete" option. I hope I have the extra money for the modification of the exhaust when the time comes, and also hoping that an update for OVT is free.


If I may ask, what is DEF?
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post #13 of 14 (permalink) Old 01-26-2019, 01:00 PM
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DEF = Diesel Exhaust Fluid. It's urea, basically, and many newer diesels use it as an aftertreatment to further reduce pollution. Run out and your car won't start (yes, you must add it.) Modern OTR truck engines use it too (and there actually PUMPS for it at truck stops now, as well as being sold in multi-gallon "carboy" style containers.)

The delete option only works if you don't live somewhere that demands emission testing on diesels and can/will catch it. If you do, then no soup (registration renewal) for you.
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post #14 of 14 (permalink) Old 01-26-2019, 07:18 PM
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Originally Posted by tickerguy View Post
DEF = Diesel Exhaust Fluid. It's urea, basically, and many newer diesels use it as an aftertreatment to further reduce pollution. Run out and your car won't start (yes, you must add it.) Modern OTR truck engines use it too (and there actually PUMPS for it at truck stops now, as well as being sold in multi-gallon "carboy" style containers.)

The delete option only works if you don't live somewhere that demands emission testing on diesels and can/will catch it. If you do, then no soup (registration renewal) for you.
I don't think my Mazda 6 diesel has this one. I don't have a separate tank for filling this thing up. I asked the dealer where is this DPF and that's it. I mean, the guy didn't mention about this DEF. I'm running 30,000 km right now and I just visited our dealer yesterday for my free oil and oil filter including labor. Since it is free, I asked the tech guys to have a lunch with me in a nearby cheap buffet restaurant.

I've encountered this DEF with a colleague who owns a Volkswagen golf. It has a separate tank and you are correct about the engine stopping once you depleted the fluid.

Regarding the delete option, I really hope I don't have to do that.

If I may request, can you instead reply directly to my post? I want to follow your reply and I want to be notified immediately on my email if ever you are answering directly to my post. I find this important coming from a guy who's running with hundreds of thousands of kilometers with the 6.
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