Hatterasguy, not everything we see is the result of the engineer's doing. Much of what we see is the result of what the managers, bean counters, and tacticians saw appropriate. Remember, this is the same company that released the disintegrating wiring harness insulation design onto the public. It is wise and prudent for us on the internet to second-guess the "engineer's" decision.

Personally, I think they spec'ced Mobil1 0W-40 synthetic for a number of reasons:

- The dealer can stock a "one-size-fits all climates and driving conditions" oil to simplify their shelves.
- Simplify the thinking it takes to pick the proper oil for a client's vehicle.
- Reduce the number of goodwill engine replacements because of owners who neglect their oil maintenance.
- Reduce the number of free oil changes during the warranty period.

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95 E320 Cabriolet, 169K