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  #51  
Old 11-10-2016, 07:25 PM
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Bear in mind I didn't pay $2099 retail price, I held the SA to a price I found online. He threatened that 'it's not a BMW part, and we will not warranty it'. However, when looking, it is a genuine BMW, and no note was made in the SA docs on delivery. Ces't la vie.

Back flush was done initially by BMW with diesel.

Hard line flushing was done by diesel specialty shop, and included the fuel rail, hard lines, essentially everything downstream of the HPFP.

Fuel has sediment in it. Fuel systems corrode and develop sediment over time. To not trust the fuel filter to catch some remnant metal particulate is a bit of folly, as I feel at this point. Any metal bits in the fuel return line will remain on the opposite end of the system, and behind the fuel filter.

Fuel filters save lives.

E
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  #52  
Old 12-06-2016, 03:11 PM
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Just about a month in now.

Had the X in for the complete 100k service at a trusted Indy shop, given a clean bill of health. 100k tranny service resulted in somewhat smoother shifts. Pulled zero codes, no notable diagnostic issues.

Idles smoothly, wife reports no concerns or complaints.

Discussed with indy shop about the fuel system, and they concur with the concept of accepting personal accountability for the project. Beyond the initial service warranty, the only thing BMW's warranties are good for is wiping things off certain body parts.

Hearing from this shop about their good luck with BG products, but not too certain I want to start going that road with this motor. Will probably let them mess with my TDI Jetta wagon BEW motor and see how it works out.

Anyone mess with BG treatments or warranties?

E
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  #53  
Old 12-06-2016, 04:32 PM
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E, getting the typical BMW "No additives" clause out of the way, I have messed with the BG diesel stuff on the A3tdi and it (Dieselcare) seemed to do less than what the BG44K did with my old M30. Running a couple of cans through the M30 livened it up while doing the same on the tdi did not seem to change much. Butt dyno, mpg, engine feel all taken into consideration.

I used the DFC with lubricity HP following the recommended mix and that did not help with prolonging or avoiding the HPFP grenading. Replaced the tdi injectors and the tips had as much carbon as the used set I was replacing them with. I doubt much "cleaning" was being done. BG Cetane improver was meh as the tdi did not seem to have any more grunt as without it. I did this for the first year and a half of owning the tdi after setting a "stock" baseline in the first three months of ownership. The fuel additives were quit after the first year.

What I did have success with was Liqui Moly's Ceratec oil additive. Mpgs and engine performance improved a bit just by adding this to the oil changes. Nothing else was changed. Stock OE filter, Liqui Moly VW rated diesel oil ( Top Tec 4200). Diesel idle was slightly more quiet and the mpgs went up by a few.

You just had most of your fuel system replaced so I doubt the injectors will change any as a result of any benefits claimed by the BG diesel products.
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  #54  
Old 12-06-2016, 04:43 PM
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The X5 injectors were cleaned thoroughly at the bench testing facility, and it was impossible to discern between the old ones and the new one.

Interesting assessment on the A3. My Jetta is pre-common rail, and I think there's a difference in the Pumpe Duse motors v. common rail, but would agree with your sentiment regardless.

E
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