Best Greenworks Petrol Lawn Mower of 2026
Greenworks is widely known for battery-powered tools, but their petrol mower range offers serious power for larger lawns. We have analysed specs, aggregated owner reviews, and compared build quality to find the best Greenworks petrol mower for 2026.
Quick answer
The Greenworks G40LM46K2X is the best overall petrol mower from the brand for 2026, offering a reliable 140cc engine, 46cm cutting deck, and rear roller for stripes. For a budget-friendly option with similar power, the Greenworks G40LM40 is a strong choice.
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Research updated June 2026.
Greenworks G40LM46K2X
Powerful 140cc engine, 46cm steel deck, and rear roller for professional-looking stripes.
| Product | Best For | Engine / Deck | Rating | Price |
|---|---|---|---|---|
| Greenworks G40LM46K2X | Best Overall | 140cc / 46cm steel | 4.6/5 | Mid-range |
| Greenworks G40LM40 | Budget Pick | 140cc / 40cm steel | 4.3/5 | Budget |
| Greenworks G40LM46 | Value with Mulch | 140cc / 46cm steel | 4.4/5 | Mid-range |
| Greenworks G40LM51 | Large Lawns | 160cc / 51cm steel | 4.5/5 | Premium |
| Greenworks G40LM46S | Self-Propelled Ease | 140cc / 46cm steel | 4.4/5 | Mid-range |
Greenworks G40LM46K2X
Best OverallPros
- Rear roller for striped lawn finish
- Reliable 140cc Briggs & Stratton engine
- Large 60L grass collection bag
Cons
- Heavier than some competitors at 32kg
- No self-propelled option
The Greenworks G40LM46K2X is the top pick for most homeowners who want a petrol mower that delivers a professional finish. It features a 140cc 4-stroke engine that provides ample power for medium to large lawns up to 800 sq m. The 46cm steel cutting deck is durable, and the rear roller creates classic striped patterns on the grass.
Owner reviews consistently praise its cutting performance and reliability, with many noting it starts easily after winter storage. The 60L collection bag is generous, reducing the frequency of emptying. The main drawback is the weight, which makes it less manoeuvrable on slopes, but for flat lawns it is a solid performer.
Greenworks G40LM40
Best BudgetPros
- Lower price point for budget buyers
- Compact and easier to store
- Reliable engine performance
Cons
- Smaller 40cm deck takes longer on large lawns
- No rear roller for stripes
The Greenworks G40LM40 is a solid entry-level petrol mower for smaller gardens up to 500 sq m. It uses the same 140cc engine as the larger models, so you get reliable power without the higher price tag. The 40cm cutting deck is nimble and easy to push around flower beds and tight corners.
Owner feedback highlights its ease of use and good build quality for the price. The 50L collection bag is adequate for small lawns. However, it lacks a rear roller, so you will not get striped grass. It is a straightforward, no-fuss mower that gets the job done without breaking the bank.
Greenworks G40LM46
Best Value with MulchPros
- Includes mulch plug for grass recycling
- Large 60L bag capacity
- Good power for medium lawns
Cons
- No rear roller
- Side discharge can be messy
The Greenworks G40LM46 is a versatile mower that comes with a mulch plug, allowing you to recycle grass clippings back into the lawn. This is a great feature for those who want to fertilise naturally without collecting clippings. It shares the same 140cc engine and 46cm deck as the top pick, but without the rear roller.
Owner reviews note that the mulching performance is effective, leaving a clean finish. The 60L collection bag is large, and the six height settings offer good flexibility. The lack of a rear roller means no stripes, but for users focused on lawn health and speed, this is a strong mid-range option.
Greenworks G40LM51
Best for Large LawnsPros
- Largest 51cm deck for faster mowing
- Powerful 160cc engine for tough grass
- Huge 70L collection bag
Cons
- Heavy at 36kg
- Higher price point
The Greenworks G40LM51 is the largest petrol mower in the range, designed for lawns over 1000 sq m. It features a 160cc engine and a 51cm steel cutting deck, which significantly reduces mowing time. The 70L collection bag is the biggest available, meaning fewer trips to the compost heap.
Owner reviews praise its cutting power through thick grass and its robust construction. The larger engine provides good torque for wet conditions. The main trade-offs are the weight and price, making it less suitable for smaller gardens or users with limited strength. It is a heavy-duty machine for serious lawn care.
Greenworks G40LM46S
Best Self-PropelledPros
- Self-propelled drive reduces effort
- Good for sloping or large lawns
- Same reliable 140cc engine
Cons
- Drive system adds weight
- No rear roller
The Greenworks G40LM46S adds a front-wheel self-propelled drive to the standard 46cm platform. This makes it much easier to push on long lawns or gentle slopes, reducing user fatigue. The 140cc engine provides consistent power, and the 60L bag is a good size.
Owner reviews appreciate the drive system for its simplicity and effectiveness, though some note it can be less effective on very steep inclines. It is a practical choice for those who want the convenience of self-propulsion without moving to a larger, more expensive model. The lack of a rear roller is the main compromise.
What to check before buying a Greenworks petrol mower
First, measure your lawn area. Greenworks petrol mowers are best for medium to large lawns (over 300 sq m). Smaller lawns may be better served by a cordless electric model. Check the cutting width: 40cm is fine for small gardens, but 46cm or 51cm is more efficient for larger spaces.
Consider the terrain. If your lawn is flat, a push mower like the G40LM46K2X is fine. For slopes, a self-propelled model like the G40LM46S is easier to use. Also, think about whether you want stripes (requires a rear roller) or prefer mulching (requires a mulch plug).
Mistakes to avoid
Do not buy a mower with a deck size too small for your lawn, as it will take much longer to mow. Avoid choosing a model without checking the height adjustment range; ensure it covers the grass length you typically have. Also, do not overlook the weight: heavier mowers can be difficult to manoeuvre on uneven ground.
Finally, avoid buying a model without considering spare parts availability. Greenworks is a well-supported brand, but it is wise to check that replacement blades and filters are easy to find for your specific model.
FAQs
Are Greenworks petrol mowers reliable?
Yes, they use reliable 4-stroke engines from manufacturers like Briggs & Stratton, and owner reviews generally report good reliability and easy starting.
Do Greenworks petrol mowers come with a warranty?
Most Greenworks petrol mowers come with a 2-year warranty, though this can vary by retailer and region.
Can I use a Greenworks petrol mower on thick or wet grass?
Yes, the 140cc and 160cc engines provide enough power to handle thick grass, but it is best to avoid mowing very wet grass to prevent clogging.
What is the difference between the G40LM46K2X and G40LM46?
The G40LM46K2X includes a rear roller for striped lawns, while the G40LM46 does not. Both have the same engine and deck size.
Do Greenworks petrol mowers require oil and fuel mixing?
No, they are 4-stroke engines that use separate petrol and engine oil, similar to a car.
Which Greenworks petrol mower is best for a large lawn?
The Greenworks G40LM51 with its 51cm deck and 160cc engine is the best choice for large lawns over 1000 sq m.
Are spare parts easy to find for Greenworks mowers?
Yes, Greenworks is a well-known brand, and replacement blades, filters, and spark plugs are widely available online and in garden centres.
Can I mulch with a Greenworks petrol mower?
Yes, models like the G40LM46 come with a mulch plug, and some others have optional mulch kits available.
How often should I change the oil in a Greenworks petrol mower?
It is recommended to change the oil after the first 5 hours of use, then annually or every 25 hours of operation.
Is the Greenworks G40LM46K2X self-propelled?
No, the G40LM46K2X is a push mower. For self-propulsion, consider the G40LM46S model.
Our verdict
The Greenworks G40LM46K2X is the best overall petrol mower for 2026, offering a powerful 140cc engine, a 46cm deck, and a rear roller for striped lawns. For budget-conscious buyers, the Greenworks G40LM40 provides reliable performance at a lower price point for smaller gardens.