Just to add to this post, I have been using 2 stroke oil in my 850 TDI for months now. Quieter engine, and on initial usage an increase of about 3 mpg which has stayed there.
Not noticed anything with smoke, there's enough of that as it is with the TDI.
I have been told NOT to use semi-synth or synth for this purpose and to stick to mineral only oils.
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'98 V40 2.0T B4204T - died...
'96 855 2.5 TDI D5252T - 255,000 miles
"Diesel without turbo is like a woman without boobs... sure you can drive it, but there's always something missing."
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