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Oil viscosity and oil change interval on my 1HZ powered 105. I believe it's the same for 1HD-T and 1HD-FT.
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The 3000-5000 mile changes are on trucks that don't see a lot of miles; oil change intervals could easily stretch to two years to rack up that kind of mileage. The oil is very inexpensive when purchased in bulk so it is easier to just do oil changes every couple of years and not worry about the mileage.IMO 3000-5000miles is madness. It's not the 1960's any more. Many vehicles now are north of 30,000km and John Deere are advertising diesel oil with 500 hour oil change intervals.
5W40 is fairly thick for a tdi. I run 5W30 in mine and it's got an oil quality sensor that tells me when it needs changed. This is usually around 24,000km (16k miles).
My engine is a Pumpe Duese which can wear out cams with the wrong oil. But with over 200,000km it's still working great.