Which of the above would be better in the long run?

Note: 3000 mi syn oil changes are not an option, unless you can find it for me as inexpensively as regular oil.

I change my oil myself so labor costs are not a factor.

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86 560SL
With homebrew first gear start!
85 380SL
Daily Driver Project

http://juliepalooza.8m.com/sl/mercedes.htm