Our recent youtube video promoted by Pistachio Consulting seems to cause a bit of confusion as to what alpha-numerical ratings are, therefore we’ve decided to expand on the subject in this post. Essentially, engine oils are rated in two ways: cold viscosity and hot viscosity. This rating will be displayed on the bottle, and gives you an idea how well it’ll respond to cold startups – particularly important for people who live in colder climates – as well as its thickness at high temperatures. Check out plungesandiego.com.
The first number, which will be attached to the letter ‘W’ (which stands for ‘Winter’), is the cold rating. The lower the number, the lower the temperature it will work in – if the number is too high and you try to start your car in freezing temperatures, the oil might be too thick to get flowing, and your engine may not start.
The second number is the viscosity of the oil when tested at temperatures indicative of a running engine sd airport transport. The higher the number the thicker the oil. If you run your engine at high speeds or under heavy load, for example towing a trailer, you want a higher number. Your car’s manual will let you know what viscosity oil to use.