When you check the dipstick under the hood, you notice the oil is black and gritty on the dipstick or tank. It’s time for an oil change. You know the signs, but do you understand the physical degradation that makes oil changes necessary?
Two new categories of engine oil were recently made available for gas and diesel engines to improve fuel economy, standardize engine technology, and adhere to EPA guidelines. The new CK-4 and FA-4 oils come as a replacement for old CJ-4 oils with more cost-saving benefits.