Re: JTD 1.9 Running in?
Rule 1 - let the temp gauge get to normal before going over 2000 RPM
Rule 2 - No short trips - take the long way round to get the temp up to normal on every trip
Most of what people are saying about running in seems to be speculation, it probably doesn't make a great deal of difference, but I found this a few years ago (HonestJohn.co.uk) and used it on my last two new diesels, they both ended up using zero oil, going like stink and feeling brand new at 20,000 +, so it certainly won't hurt.
For the first 1,000 miles do not exceed 3,000rpm, but make sure you reach 3,000rpm regularly. For the next 1,000 miles (to 2,000 miles) do not exceed 3,500rpm, but make sure you reach 3,500rpm regularly. For the next 1,000 miles (to 3,000 miles) do not exceed 4,000rpm, but make sure you reach 4,000rpm regularly. For the next 1,000 miles (to 4,000 miles) do not exceed 4,500rpm, but make sure you reach 4,500rpm at least a couple of times a week. After that, no limit, but make sure you continue to hit 4,500rpm through the gears several times a week. The benefit of this is it helps to self clean the injectors, it blows any accumulated soot out of the exhaust system and it helps to free off the piston rings, making the engine more efficient and less likely to use engine oil.