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Hope I'm not dragging up too much of an old discussion/argument but I've heard varying opinions over the past few days. My 2001 156 1.8 TS had her 108,000 mile service last week and looking at the receipt for the work done the oils been changed with fully synthetic 5W/40. I've always put semi synthetic 10W/40 in her and have got 5L of this sat in the garage. Would it cause any harm topping up with the semi 10W or should I just shell out and get some 5W fully synthetic?