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Does the insulation actually make much difference? I finally threw mine away a few months ago, after mice got to it again, and can't really say I notice anything. Is it louder without? Maybe only at startup?

For testing, I think what works best is doing a strict on-off regime for successive tankfuls, and then analyzing the resulting distributions for significance of difference. The beauty of this method is that the distributions tell you the reproducibility of your mileage, so you know whether the...

That's actually not true. I did analyze some other people's data, and for standard Golfs it makes a 5% or so difference. Sadly, not for my Sportwagon. I'm guessing the roof rack already creates enough disturbance. So, they do work on some cars.

Just a cautionary tale: My shop swore stone and bone that it was my right front wheel bearing that was bad, causing noise and vibrations. They even mounted some microphone on the outside of the car to pinpoint the noise. After I replaced the front bearing, it turned out it was the rear bearing...

Blown head gasket, and water getting into the exhaust? The exhaust condensate should taste slightly sweet if it is coolant. Too much diesel should be black, not white/gray. I'm not sure how unburned fuel would make it through, unless the injection timing is completely off.

Sounds good. Those of us who drive a lot (not me anymore) will have to decide what to do with the car or DPF/EGR once the warranty expires. It might make sense to either sell the car, or put the (relatively new) DPF and EGR on the shelf, or maybe just block off the EGR, and keep driving with a...

Unfortunately a VW dealership won't fix the problem under warranty (and soot in the tail pipe IS a problem) until a permanent code is thrown. Which means at that point the EGR filter is also destroyed. Unless you are in a very narrow time or mileage window before your extended emissions warranty...

Ok, good to hear (well, in a way), so not completely uncommon.

It's a commercial product.

That coil would have to make it through the top of the fender and through the hood. That's a whole lot of metal. So, while certainly amusing to imagine, not very likely.

How about gas (propane or natural gas) injection? At the Geneva car show a few years ago there was a company selling gas conversions (add-ons, really), and I talked a bit with a guy at the booth. Apparently the TDI can also run on gas plus diesel at the same time, for more power (which is not...

On my 2012 TDI Sportwagon the left front spring snapped about 7/8 of a turn from the top end after 8 years of (Illinois) driving and one year of mostly sitting, at 113,000 miles. My independent shop recommended Monroe quick struts as the most cost effective solution. After reading some not so...

The OP is after performance/economy.

Mongler, that (you always have an abundance of air) is just not true, otherwise you would not need the turbo loader.

I'm not sure what the intercooler has to do with the A/C. Air density is proportional to 1/absolute temperature, that is air temperature measured in Kelvin. Going from 27C (300K) to 57C (330K) looses 10% of air charge (mass) at the same pressure. Which for the same fuel/air ratio means 10% of...

My only bad experience with fuel was from a Shell station, back when I still had a gasoline car. They sold me a water/gasoline mixture, and refused to cover the towing and repair cost. Haven't been back to that station in 20 years, and I drove by every day.

Wrong car, Declan; see post #10. The OP bought the fancy all-metal version...

Diesl's TDI Torque screen

John, I appreciate your interest and input, but I assumed 'not driving due to retirement and pandemic' was enough info. I drove on only a few days during that whole year. Three months of sitting, twice, was enough to kill off the eight year old battery. Neighbors have even killed new batteries...

There have been some great posts in the last few years! Unfortunately I have not been very active; just this week I finally reloaded my csv file for the extended PIDs into Torque on my new phone. I don't know whether hotpocketdeath's csv link is still around (the dropbox file in post #29 seems...