Adding an uncontrolled volume of additives to your oil is like putting salt on your dessert. It takes years of additive blending experience to come up with the right formula for Shell Helix oil, and the way the various additives are mixed in with the base oil is crucial to the oil’s overall performance. So our strong advice is “do not add additives” if you aim to get the most from your car. The addition of additives may lead to expiration of the vehicle manufacturer’s guarantee.
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