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Oil whose use leads to fuel savings of more than 1.6%. you can identify it by the marking
ACEA A1/B1 or A5/B5 or C2 or C1, or API SN ILSAC GF-5 or API SM ILSAC GF-4
Not always. It’s important to remember that in the case of engine oil, the price is not a consideration, but only its suitability for the vehicle and the manufacturer’s requirements.
It’s generally not a good idea. The oil already contains all required additives, and in exactly the right balance; don’t change it. Adding an external component is liable to harm the oil and cause damage.
In vehicles with high oil consumption, or in very old models, specific additives can be used, but only after consulting a professional.