With the right additives to help it resist thinning too much in the heat, an oil can be rated for one viscosity ... high-tech engines, new cars, higher-mileage vehicles, heavy-duty/off-road ...

Today's cars are the best ... something we can all get behind. Here's how to check the six essential fluids in your car. After fuel (unless you have a fancy EV), oil is your car's most important ...