Updated at: 19-03-2022 - By: micdot

This content contains affiliate links. Please be aware of this when reading. Using any of the links on this page will allow me to earn a small commission at no additional cost to you. Even if the viscosities and weights of the two oils aren’t the same, mixing them is perfectly safe. Is it safe to combine different viscosities and weights of oil together?? 5w20 and 10w30 engine oils can be mixed, right?

There is no need to advocate mixing motor oils. However, if your motor runs out of oil in the middle of your trip, you could be stranded. Such situations may necessitate the use of a different oil, and you may be forced to do so if the current oil is unavailable.

Can You Mix 5w20 And 10w30?

Because both oils will continue to lubricate the engine’s components, a blend of two different oil weights or viscosities is generally safe. Mixing oils, on the other hand, will have no effect on the performance of your car’s engine. This is due to the fact that each oil’s additives have a distinct purpose. If these additives were not blended, your engine would miss out on the full benefits of the oils because of their incompatibility.

The effect of combining 5W20 and 10W30 oil is vehicle-specific. Is your vehicle capable of running on either of these fuels? Should I use 10W30 or 5W20? Regardless of what your automobile manufacturer says, mixing 5W20 and 10W30 in your engine won’t hurt it. Some drivers, on the other hand, argue that blending two straight weight oils or multigrade is safer than doing so. Using 5W20 in the winter can help maintain your engine parts lubricated at all times because it will flow more easily. When it comes to low temperatures, 10W30 can flow, but the flow speed is slower than 5W20.

What Happens When You Mix 5W20 and 10W30?

Motor oil comes in a wide variety of weights and viscosities, although 5W20 and 10W30 are the most often used by motorists throughout. 5W20 is not a huge problem to add to an engine that has been using 10W30. The low viscosity grade of 5W20 would allow your engine to run smoothly during the cold months. An crucial point to keep in mind is that oils do not genuinely blend or combine, as we commonly state.

When you add 10W30 to a 5W20 engine, the 10W30 separates and does not mix well. As a result, you will need a few quarts of 5W20 and one of 10W30. It is impossible to combine the two oils into a single oil. Using two different oil weights in the same engine is perfectly acceptable in any of these situations. Because of the mixing of fluids, your oil change intervals may be shorter. Thicker oils may cause an increase in fuel consumption if your engine is designed to use lighter fluids. Why? Thicker motor oil will need more energy from your car’s engine, resulting in a greater need for gasoline.


5W20 and 10W30 can be mixed, right? You can indeed combine the two oils. You may already know that mixing motor oils is not recommended because it does not provide any advantages. This can also void your car manufacturer’s warranty coverage. We’d rather you save money on your car by using more of the recommended oil. So, in the event of an emergency, you may just pull over, top off the oil, and get back on the road. It’s better for your car if you stick to one brand and weight of oil.