"why have they reformulated?" They may, may have changed because of technological advances. Because things are changed doesn't necessarily suggest they were wrong. Not questioning your conclusions. I will think about switching in my MB and keeping the green in my '65 Ford cast iron pickup for nostalgia. This and other threads are interesting for the interplay between information and experience. Both have their strengths and weaknesses.

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Dan Stadt
'85 300D turbo
'79 300SD
'73 220D