My wife and I have a 2000 NB TDI. I may be wrong but I remember the glow plugs in the past taking longer to warm the cylinders. It has been getting down into the low 40s high 30s the past week or so and the glow plug light is only staying on for at most 1 and a half seconds. The car does start after a few revs but I thought in the past it stayed on longer and then started almost instantly. How long would you estimate that your glow plugs are on in those temperatures? Also does anyoen know if there is anyway to adjust glow plug temp/time with a VAGCOM? We had the plugs and harness replaced a month or so ago and I wondered if they messed with it.