However, if your car normally requires the use of 5W-20, it's dangerously low on oil, the only motor oil you have available is 5W-30, and you must drive it, it's better to add the 5W-30 than it is ...

Read more: 15 Popular Oil Filter Brands, Ranked If you're using a synthetic blend, which is a mixture of conventional ... motor oils, and you can get it in 0W-20, 0W-40, and 5W-20 viscosities ...