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you serious chris? where do you get it from then?
The additives only really make a difference on modern higher performance engines. Older, inherently less efficient, designs are more tolerant of fuel variations. That's why old Mercs are so favoured in Africa where the fuel is.... err...... variable!If you are running a high mileage engine, the last thing you want is a detergent washing out all the deposits. It will start leaking straight away!