Snake oil. Mouse milk. Whiffle dust. Take your pick — few products have earned such unflattering sobriquets as aftermarket motor-oil additives. And for the very good reason that these promised ...

Oil additives play an essential role in maintaining car engine health. They provide additional lubrication, protect against wear and tear, and help remove impurities and build-up from your engine.

You already know how critically important regular oil changes are for your car. Without them, your car’s innermost components and systems can face serious problems — and you could wind up with costly ...