C Semester

Additives

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There are different types of additives. Find the ones that are described. The first letter is given.

The following additives do different things. 1. They limit the damage due to friction: w preventers -- 2. They lower the freezing point of oil: p - point depressants -- 3. They keep the engine parts clean: d 4. They reduce foam in the crankcase: anti - f 5. They prevent the corrosion of metal surfaces: corrosion i