Mower Oil: Are YOU Using the WRONG Kind?

Selecting the correct motor oil can be confusing due to the numerous choices. This guide explains whether you can use 5w20 instead of 10w30 in your lawn mower.

Can you substitute 5W-20 oil for 10W-30 in your lawnmower? Let’s explore this question!

Yes, you absolutely can. Top engine makers such as Briggs & Stratton, Honda, Toro, and Kohler currently recommend using 10W-30/SAE 30 or synthetic 5W-20/5W-30 oil in their engines. For newer engines, 10W-30/SAE 30 or 5W-20/5W-30 are good choices. 5W-30 is frequently the viscosity of choice.

5w20 VS 10w30 – Which One Is Better?

Let’s explore the main differences between 5w20 and 10w30 engine oils. 5w20 is a thinner oil, perfect for vehicles in colder weather. It also works well in engines like snowmobiles. The “20” indicates the oil is only 20% weight, with the rest being an anti-foaming agent. On the other hand, 10w30 is a thicker oil, best for engines in warmer climates.

As of 2025, 10w30 oil is formulated with 30% oil by weight. The rest consists of anti-foaming agents. Let’s examine the pros and cons of using 5w20 instead of 10w30 in your lawn mower. We’ll consider the newest engine tech and oil formulations.

The main advantage of using 5w-20 motor oil is that it costs less.

However, 5W-20 oil might not fully protect your lawn mower engine. This is a significant disadvantage to consider.

Given this information, determine if the possible savings are worth using 5W-20 oil. Be aware that some cheaper oils, such as 5W-30, are sometimes sold for lawn mowers. While they may seem similar to 10W-30 in terms of protection, using them could damage your mower’s engine. To avoid engine problems, don’t use them.

The Benefits of Using 5w20 in a Lawn Mower

5w20 oil is a thinner oil that flows better at colder temperatures

5w20 oil is less viscous, which helps your lawn mower engine start more easily in cold weather

5w20 oil provides better fuel economy and reduces emissions

5w20 oil is less likely to cause carbon build-up on your engine’s pistons and valves

5w20 oil provides better protection to the engine, so it will last longer

The Benefits of Using 10w30 in a Lawn Mower

10w30 oil is a great choice for lawn mowers because it provides good performance and protection

It helps to keep your engine running smoothly and reduces wear and tear

10w30 oil also protects your lawn mower against corrosion

It helps to prevent dirt and debris from entering the engine, which can cause damage

Using 10w30 oil in your lawn mower will provide better protection against wear and tear over the long term

What Are the Benefits of Using a Particular Weight Oil in a Lawn Mower?

Many oil types work in lawn mowers. Knowing each oil’s benefits ensures top performance in 2025.

Currently, many believe using heavier-weight oil in lawn mowers provides benefits. For instance,

Reduces wear on the engine

Keeps the engine cooler

Lubricates the moving parts

Reduces emissions

Improves fuel economy

Extends the life of the mower

Final Words

Ultimately, selecting 5W-20 instead of 10W-30 for your lawn mower is a personal decision. Both oils provide similar performance and should work well. Your final choice in 2025 depends on your lawn mower engine’s specific requirements and your individual preferences.