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Ron,
What viscosity does your book call for? I have only had diesel MBs ... 15w-40 sounds a bit thick for a modern gasoline engine ...
Regarding whether one should change to synthetic - this is easy one - of course you should, if you want the best lubricant with minor added cost. Synthetics are better in every way except price per mile - they do allow increased change intervals, but that isn't the best reason to use syn - the best reason is that it is simply better than dyno - in every technical respect.
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George Stephenson
1991 350 SDL (200K and she ain't bent, yet)
former 2002 E320 4Matic Wagon - good car
former 1985 300 CD - great car
former 1981 300 TD - good car
former 1972 280 SEL - not so good car
a couple of those diesel Rabbits ...40-45 mpg
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