I just changed the oil on my 03 4.6is. Used Mobil 1 High Mileage 10W40 fully synthetic, roughly 8 quarts.

Thinking of adding a bottle of Liqui Moly Motor Oil Saver (300ml). Should I add another half quart of 10W40 just to be safe?

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2003 X5 4.6is Estoril Blue, acquired March 2018
2013 128i M Sport 6 MT Space Grey daily driver
2010 535xi 6 MT Barbera Red