Just fill with the new oil. I suggest changing the filter each oil change, cheaper than a new engine.

You will want to change the filter an extra time at about 1000 miles after switching, as the synthetic will strip all the "varnish" and any associated grit off the insides of the engine within the first few hundred miles, and any crud will end up in the filter.

This may or may not cure the lifters -- I have one or two tapping away after Mobil 1 and new filter shaft o-rings, so have to consider replacement. Whoda thought you might need new lifters after only 206,000 miles?

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!