STIHL MS 170 vs MS 180: Which Homeowner Saw to Buy (2026)

Review Information

• Reviewed by: Jack Beurge
• Review type: Research-based review
• Testing status: Not personally tested by SAWOFF — based on manufacturer documentation, reputable sources, and documented owner-reported patterns
• Published: October 15, 2026
• Manufacturer: STIHL

Information in this review is labeled as one of four types: 🧪 SAWOFF hands-on test, 🏭 manufacturer specification, 📚 research from reputable sources (including documented owner-reported patterns), or 🧠 editorial assessment. See our testing methodology and editorial policy.

Buy the STIHL MS 180 if you cut for a few hours every month; buy the MS 170 only if the budget decides before you do. The stihl 170 vs 180 question is really about two bits of displacement and the price of a lawn-service visit — the MS 170 runs 30.1cc with 1.8 hp on ~10.1 lb, while the MS 180 answers with 31.8cc, 2.0 hp, and a slightly longer service cushion on periodic chores, all for about $40 more typically. Everything else that matters is in the numbers below.

Spec snapshot before we start:

Spec	STIHL MS 170	STIHL MS 180
Displacement	30.1 cc	31.8 cc
Power	1.8 bhp	2.0 bhp
Powerhead weight	~10.1 lb	~10.7 lb
Max bar	16”	16”
Chain	3/8” Picco, PM3, .043”	3/8” Picco, PM6, .050”
Drive links (16” bar)	~68 (approx.)	~64 (approx.)
Typical street price	~$189	~$229

Weight counts the powerhead only; prices are the street figures we hear quoted most often and vary by dealer and year.

Four Hard Reasons the MS 180 Wins

More torque where branches get thick

The 31.8cc engine gives the 180 about 11% more power, and you feel that not in top speed but in the middle of a cut. Limbing tops that run 8 to 10 inches — maple, tightly grown ash, dead pine thick with bark — the 180 keeps the chain planted where the 170 begins asking to lighten its workload. On an occasional saw that difference is cosmetic. On a saw you pick up weekly, it is the difference between finishing and stopping to sharpen.

A longer service life on routine chores

Both saws are the same basic architecture, but the 180 runs its margin shallower under the same load. Pull the same branch with a smaller engine running closer to its ceiling, and wear lands faster on rings, bearings, and the cylinder wall. Owners who use the family saw for hours each season report the 170 getting tired sooner, mechanically speaking. For homeowner saws we say this carefully: in a family of three, expect many seasons of either — the 180 simply reaches limping age later.

The Ematic oil system option

Here is a spec worth checking at the dealer. Most MS 180 trims in current stock carry STIHL’s Ematic bar lubrication system, which feeds oil in metered grooves and claimed cuts bar oil use by up to half. Base MS 170 configurations generally do without it. Since you refill oil every few tanks on homeowner chores, that savings compounds over a decade of ownership, and the pump hardware itself is low-maintenance rather than troublesome.

Parts and chain fitment commonality

Wear items — bars, chains, sprockets, spark plugs, caps — interchange easily across the pair, but the 180’s wider .050 gauge ecosystem is what every dealership and hardware shelf stocks by default. The narrower .043 chain on the 170 is the flip side: it cuts faster in clean softwood and it is fragile compared with the 180’s PM6, so you will buy and dress the 170’s cutters more frequently if you hit real wood often. Over the saw’s life, the 180’s consumables are the simpler shopping trip.

What 30cc Actually Covers — and What It Cannot

A 30cc saw with a 16-inch bar is a yard tool with defined edges, and happy owners are the ones who respect them. Read this list before you pick either model:

• Pruning branches up to about 6 inches on ornamentals and fruit trees
• Clearing storm breakage from driveways and fence lines after a small blow
• Bucking softwood rounds to 8 inches for kindling or a weekend fire pit
• Knocking down volunteer shoots and tangled growth where a big saw is clumsy

Tasks that break the illusion are just as clear. Repetitive hardwood rounds at 10 inches, any felling near structures, milling, or more than an hour of sustained cutting are 45cc-class chores. Trying them weekly on a 170 or 180 ages the saw far ahead of schedule, and the sharpening schedule starts feeling like a part-time job.

Both saws share their limits, by the way — nothing in this comparison makes the 180 a bigger saw. The delta between them is comfort inside the envelope, not the envelope itself.

When the MS 170 Still Wins

Do not mistake our verdict for a rout. The 170 hangs onto real advantages for specific buyers.

Money comes first. Street quotes typically keep the 170 about $40 under the 180, and when trimming a few ornamentals is the entire job description, the difference between the two engines never shows up. Occasional cutters — the person who limbs annually and splits nothing — will live with a 170 without complaint. At ~10.1 lb it is also the lighter carry of the pair, by a few tenths of a pound.

Match the saw to the job before choosing: for a full picture of where both saws fit in the range, our STIHL MS 170 review and STIHL MS 180 review go deeper on each model, and our best STIHL chainsaws roundup sets them beside bigger siblings. If your intended work includes anything near the 16-inch bar maximum on a regular basis, both 30cc saws are undersized for it — our best chainsaw for homeowners list is where to step up.

Bottom line: for thin branch trimming on a fixed budget, the MS 170 does the identical job at the lower price. Everything else tips to the 180.

Owning Costs Over Five Years

Run the ownership math, because small saws rack up consumables. A chain set runs $20–$30, files and guides another $15 or so a season, bar oil a few gallons a year, plus a plug, filter screen, and fuel cans once. More chain time on the narrower .043 cutters of the 170 means slightly faster sharpening cycles if you cut real wood regularly. The initial $40 gap between the two saws amortizes to a rounding error across five seasons — which is why our tiebreaker advice leans engine quality, not sticker.

Resale holds up across both models, too. Small STIHLs move quickly on the used market because demand from first-time homeowners never dips; a maintained 170 at $100 and a 180 at $130 are both gone in a weekend locally. Buy either and you are not trapped in it.

The Differences You Will Actually Feel in the Cut

Paper deltas hide the practical texture. In softwood, the narrower .043 chain on the 170 matches its bigger sibling’s pace — for light pine limbing, many owners cannot tell the saws apart without weight changes in hand. On thicker, denser tops where the 170 protests, the 180 settles. Both start with a similar routine: prime, choke, pull. Neither carries advanced anti-vibration mounts at the price; hours over two feels tiring on either.

Cold-morning behavior and fuel systems are near-mirrors across the range of small STIHLs — there’s no half-choke drama on either, and the tools needed are the same. The point: the 180’s advantage shows up on specific wood and on the calendar of ownership rather than in the first five minutes of the season.

STIHL 170 vs 180 for Firewood and Bigger Jobs

Small enough to matter, real enough to plan around. Firewood on a 3/8” Picco chain at 30cc is reasonable for split-kindling lists and softwood rounds to 8 inches; dense oak rounds at the same size slow to a grind. If firewood is your actual mission, the 45.4cc MS 250 class is the honest entry point. For tiny branch cleanup that sits below even the 170’s work radius, a mini chainsaw is arguably a better fit — see our best mini chainsaw roundup before buying petrol for jobs a 20V saw handles.

STIHL 170 vs 180: Which One Should You Buy?

Regular cutters and homeowners mapping years of yard work: the MS 180. You pay about $40 more, typically, for an engine that lives longer under chores, Ematic oiling on most trims, and a consumables ecosystem that stocks everywhere. It is the saw we point families toward when they cut in every season and want to stop thinking about the choice.

Occasional trimmers and fixed shoppers: the MS 170. If the trimming list is short, the branches thin, and the calendar sparse, the 170 saves honest money and does the work it was asked for. Nothing we wrote makes it a bad saw — it is the more honest purchase for a lighter mission.

Still deciding at the store? Walk through our STIHL chainsaw buyers guide, which sequences every decision from cc class to bar length before the counter conversation. And if the choice is broader than two models, the best chainsaws of 2026 running list frames these two small saws against the whole market.

Frequently Asked Questions

Is the STIHL MS 180 worth the extra money over the MS 170?

For most owners, yes — the roughly $40 street gap buys about 11% more horsepower from 31.8cc, an Ematic oiling option on most current trims, and a margin that holds up better on weekly chores. Only occasional users trimming a few branches a season are better off pocketing the difference.

Can the MS 170 or MS 180 cut firewood?

Both saw small firewood, within limits. Softwood rounds up to about 8 inches cut fine on a sharp chain; dense oak at that size is slow work, and anything near the 16-inch bar maximum is the saw's ceiling, not its comfort zone. For cords every season, step to the MS 250 class instead.

What chain does the STIHL MS 170 use versus the MS 180?

The MS 170 typically runs a 3/8-inch Picco PM3 chain in .043 gauge, while the MS 180 takes the wider PM6 in .050 gauge; on 16-inch bars that is roughly 68 and 64 drive links respectively. The narrower .043 chain cuts faster in softwood but is more fragile; the .050 chain is the tougher, more widely stocked option.

Do the STIHL MS 170 and MS 180 share parts?

A good share of wear parts — bar, chain, sprocket, caps, and fasteners — interchange between the two, but engine internals do not. The 180 runs a larger piston and cylinder, so order rebuild parts by exact model number rather than assuming the saws are one machine.