Small-Engine Maintenance, Checked Against the Manual

Most "how often should I change the oil" answers online are a guess. The real answer is printed in your owner's manual, and the manuals do not always agree with each other. This site does the reading for you: every guide states the answer first, gives the steps, and links the exact manufacturer document it came from so you can check it yourself.

How we work

• We start from the official owner's manual or the manufacturer's support page for the engine or machine.
• Where two manufacturers disagree (they often do on fuel storage and pump oil), we show both and explain who each instruction applies to.
• We do not publish a capacity, torque value, gap or interval unless it appears in a source we link.
• If your manual says something different from a general guide, your manual wins. We say so on every page.

New here? Start with Run It Dry or Stabilize It?, the storage question that causes the most spring no-starts, then Lawn Mower Won't Start After Winter.

Browse by machine

• Lawn Mowers

  Walk-behind mower engines from Briggs & Stratton and Honda: oil, filters, plugs and the no-start problems that follow a long winter. Every page names the manual or manufacturer document it relies on.

• Snow Blowers

  Two-stage and single-stage snow blower care: shear pins, belts, off-season storage and getting the machine ready for the first storm, based on Ariens, Cub Cadet and Troy-Bilt documentation.

• Pressure Washers

  Pump oil, intervals and freeze protection for gas pressure washers. Pump makers disagree on intervals and oil types, so these pages show you exactly where each figure comes from.

• Portable Generators

  Maintenance and storage for portable and inverter generators, taken from the owner's manual of the specific model, plus the safety rules every manual repeats for a reason.

• Engine Basics

  Topics that apply across most 4-stroke outdoor power equipment: fuel storage, ethanol, spark plugs and reading a maintenance schedule.

All guides

• Generac GP2500i Maintenance and Storage: Oil, Spark Plug, Fuel and Break-In

  Generac GP2500i maintenance: 0.36 qt oil, break-in change at 30 hours, then every 100 hours. Plug gap 0.024–0.028 in, plus 3 storage options from Generac.

• Pressure Washer Pump Oil: What Type and How Often, by Pump Brand

  Pressure washer pump oil isn't engine oil: Cat Pumps ISO 68 every 500 hours, Champion non-detergent SAE 30 every 250, Simpson AAA every 100 hours.

• Snow Blower Off-Season Storage: The Spring Checklist by Machine Type

  Snow blower storage for summer: change the oil, add fresh fuel with stabilizer and run about 5 minutes, check belts and shave plate. Steps by machine type.

• Snow Blower Shear Pin Replacement: Signs a Pin Broke and How to Replace It

  Snow blower shear pin broken? If it pushes snow instead of throwing it, check both sides of the auger. Replace with the OEM pin in 7 steps, never a bolt.

• Lawn Mower Won't Start After Winter: A Manual-Based Checklist

  Lawn mower won't start after winter? Stale gas is the usual cause. Drain it, then check the plug, air filter, carburetor, fuel filter and oil, in order.

• Briggs & Stratton Spark Plug Gap Chart: .030 vs .020 and the Quantum Exceptions

  Briggs & Stratton spark plug gap chart: most plugs gap at .030 inch, some Quantum engines and resistor plugs use .020. Never regap platinum or iridium.

• Honda GCV170 and GCV200 Oil Type, Capacity and Maintenance Schedule

  Honda GCV170 and GCV200 oil: SAE 10W-30, 13.5 oz (0.40 L) capacity. Change after 5 hours, then every 50 hours or 6 months. Full schedule and plug gap.

• Briggs & Stratton Oil Type: SAE 30 vs 10W-30 vs 5W-30 (and When Each Causes Problems)

  Briggs & Stratton oil type: SAE 30 above 40°F, 10W-30 when temperatures vary, synthetic 5W-30 for all temps. 10W-30 may burn more oil above 80°F.

• Briggs & Stratton Maintenance Schedule: What to Do at 5, 25, 50 Hours and Every Year

  Briggs & Stratton maintenance schedule: change oil after the first 5 hours, then every 50 hours or yearly; clean the air filter every 25. Full checklist.

• Run It Dry or Stabilize It? What Manufacturers Actually Say About Storing Fuel

  Run dry or stabilize fuel for storage? Honda says empty the system after 90 days; Briggs and Cub Cadet say store full with stabilizer. Who to follow.