Best petrol lawn mower 2026: the complete buying guide

A petrol lawn mower remains the go to choice for anyone with a medium to large lawn who does not want to stop halfway through mowing to recharge a battery. Where cordless mowers suit small gardens well and robotic mowers hand the whole job over, a petrol engine delivers continuous power, even on a bumpy lawn full of roots or a slope. This guide walks through what to look for when buying, from engine size to the collection system, and covers seven petrol mowers we rate as strong choices for different gardens and budgets.

What to look for

The heart of every petrol mower is the engine, usually a four stroke OHV (overhead valve) engine between 125 and 200 cc. The larger the displacement, the more torque the mower delivers, which really shows in tall or damp grass where the engine should not bog down. For an average lawn, an engine of 140 to 150 cc is plenty, but for long grass, uneven ground, or a lawn over five hundred square metres, an engine of 160 cc or more is the smarter choice. Also check whether the engine has a separate oil reservoir (four stroke) rather than a fuel oil mix (two stroke): four stroke engines are quieter, more fuel efficient, and produce fewer fumes, and are now the standard on almost every domestic petrol mower.

Cutting width determines how many passes you need to cover the lawn. For a small to medium garden up to two hundred square metres, a cutting width of forty to forty four centimetres is enough. From two hundred to five hundred square metres, forty nine to fifty one centimetres is more practical, and above five hundred square metres a cutting width of fifty three centimetres or more saves a good deal of time, though the mower becomes heavier and less manoeuvrable around borders and trees.

A third key choice is push versus self propelled. A push mower is lighter, cheaper, and takes up less space in the shed, but on a lawn over three hundred square metres or with a slope, a self propelled mower quickly feels like a relief: the wheels are driven by the engine, so you only need to steer. On self propelled models, check whether it is front wheel or rear wheel drive: rear wheel drive grips better on slopes and in turns, while front wheel drive is slightly more manoeuvrable on a flat lawn.

Also look at height adjustment. Cheaper models often have a single central lever that adjusts all four wheels at once, which is quick but less precise than a system where you can set each wheel individually. For a lawn with an uneven cutting pattern caused by moss or bumps, a wide adjustment range of twenty to seventy millimetres is a real plus.

The collection system varies a lot between models. A fifty to seventy five litre grass box is standard for an average garden, while larger lawns benefit from a box of seventy five litres or more so you are not constantly emptying it. Many modern mowers are 3 in 1 or even 4 in 1: collecting, mulching (the finely chopped grass stays on the lawn as a nutrient), side discharge, and sometimes rear discharge, switching between functions with a simple flap or plug.

Finally, wheel size, starting system, and weight all matter. Large rear wheels of twenty to twenty five centimetres roll better over uneven ground and thresholds than small fifteen centimetre wheels. A pull cord start is standard and works fine as long as the engine is well maintained, but an electric start (push button) is a welcome upgrade if pulling hard is a struggle. On weight, a compact push mower weighs around twenty to twenty five kilos, while a heavy self propelled mower with a large deck runs towards thirty five to forty kilos, which matters most if you have a step or threshold on the way to the shed.

On price, a simple push mower with a forty centimetre cutting width starts around one hundred fifty to two hundred fifty euros. Self propelled mowers with a stronger engine and larger grass box sit between three hundred and five hundred euros, and for a heavy duty model with a wide cutting width, individual height adjustment, and electric start, expect to pay five hundred to nine hundred euros.

Our top picks

For an average garden up to two hundred square metres, a push petrol mower with a forty centimetre cutting width and an OHV engine is the obvious base choice: light enough to lift and store easily, and powerful enough for a weekly mow. If you have a lawn over three hundred square metres or a noticeable slope in the garden, a self propelled petrol mower with rear wheel drive is the better investment, since it takes over most of the effort and keeps its grip on wet grass too.

If you want both collecting and mulching without switching between two machines, choose a petrol mower with a mulching function and a large seventy five litre grass box: handy in spring when you want the clippings left as feed, and in summer when you would rather collect them to avoid thatch build up. For maximum flexibility, a mower with a 4 in 1 function is a smart pick, since you can switch between mulching, collecting, side discharge, and rear discharge across the seasons without buying anything extra.

If you find a pull cord annoying, for example due to shoulder trouble, a compact petrol mower with electric start is worth considering: slightly more expensive, but you start the engine at the push of a button instead of pulling hard. If your lawn is uneven or bumpy, full of molehills or tree roots, a heavier duty petrol mower with large wheels and high ground clearance is the better choice, since it is less likely to get stuck or judder over bumps. For anyone mainly watching their budget without giving up engine power, an entry level model with manual height adjustment is a solid starting point, even if you miss out on the convenience of self propulsion.

Maintenance: keeping your engine running smoothly

A petrol engine needs a bit more attention than a cordless or electric mower, but with a little routine that maintenance is quickly done. Change the engine oil at least once a season, or more often if you mow intensively, and check the oil level before every mow. Clean or replace the air filter every few months, since a clogged filter costs power and increases fuel consumption. Replace the spark plug yearly and have the blades sharpened at least twice a season: blunt blades tear the grass instead of cutting it, which makes the turf more prone to disease and discolouration.

At the end of the season, drain the fuel or use a stabiliser, since old petrol can clog the carburettor and causes starting trouble in spring. A common mistake is storing the mower with a full tank over winter: never do that, and instead let the engine run until the tank is empty. Store the mower somewhere dry and, if possible, with the spark plug lead disconnected, so there is no risk of the engine accidentally starting during maintenance.

Which petrol mower suits which type of lawn?

For a small back or front garden up to one hundred fifty square metres, a light push mower with a forty centimetre cutting width is more than enough, and easier to store than a larger model. For an average lawn of one hundred fifty to four hundred square metres, a self propelled mower with a forty nine centimetre cutting width is the practical middle ground between speed and manoeuvrability. If you have a larger plot over four hundred square metres, a wide cutting width of fifty three centimetres or more quickly pays for itself in mowing time, especially combined with a large grass box so you do not have to stop constantly to empty it. Still unsure how to lay out your garden, or where a neat lawn would work best next to your borders and patio? [See how your garden could look with a new design on gardenworld.app](https://gardenworld.app/en) before you buy a new mower.

Frequently asked questions

Is a petrol mower better than a cordless one? For large lawns over three hundred square metres, yes, since a petrol engine delivers continuous power with no charging time. For small gardens, a cordless mower is often lighter and quieter.

How often should I change the oil? At least once per mowing season, and more often if you mow weekly or on a large area. Always check the oil level before starting.

Can I still use last year's petrol? Better not to. Old petrol loses quality and can clog the carburettor, which is often the cause of starting trouble in spring.

Why won't my mower start after winter? Usually due to old fuel in the tank or carburettor, a dirty air filter, or a spark plug that needs replacing. Start with these three points before digging further.

Conclusion

A good petrol lawn mower is an investment that lasts for years with a bit of maintenance, and delivers more power than a cordless alternative, especially on larger or uneven lawns. Choose an engine that matches the size of your lawn, match the cutting width and drive type to your area and terrain, and service the engine, filter, and blades at least twice a season. Want to see how a freshly laid lawn or a different garden layout would look in your own front yard before buying a new mower? Take a look on gardenworld.app and discover a design made for you.