Lubricants Additive

When you buy your lubricating oil for your vehicle, do you know that some comes with additives and some not? That which is without additives is normally cheaper. Try to get those with additives because additives protect metal surfaces like rings, bearings, gears etc. It also extends the lubricant life. For instance, instead of changing the oil every 3 months, you can actually extend it till 5-6 months.