The X350 uses Deere part number AM125424, a spin-on filter that fits all model years of this lawn tractor

The John Deere X350 is equipped with a spin-on oil filter that Deere identifies as AM125424. This is the original equipment manufacturer (OEM) part, and it is the filter Deere recommends for routine maintenance on this model. The filter threads onto the engine block directly — no cartridge housing or bypass valve to manage separately.

Replacement filters from aftermarket manufacturers like Fram, Kohler, and Briggs & Stratton carry their own part numbers but are designed to meet the same thread size and flow specifications. The X350's engine is a Kohler Courage single-cylinder or twin-cylinder model, depending on the year, and both use the same filter mount. If you choose an aftermarket filter, verify the thread pitch and diameter match before purchase; most retailers list cross-reference charts online.

Key Takeaways

  • The OEM filter for all John Deere X350 model years is AM125424, a spin-on type that threads directly onto the engine.
  • Aftermarket filters from Fram, Kohler, and Briggs & Stratton fit the X350 if the thread size and diameter match the original.
  • The filter should be replaced every 50 operating hours or once per season, whichever comes first, according to Deere's maintenance schedule.
  • Spin-on filters require an oil drain and refill; the old filter must be disposed of as hazardous waste at a recycling center or auto parts retailer.

Where to find the filter on your X350

The oil filter on the X350 is mounted on the side of the engine block, typically on the right side when you face the tractor from the operator's seat. On most model years, it sits below the air filter housing and is accessible without removing other components. You can reach it by standing beside the tractor or by tilting the hood if your model has one.

Before you begin, locate the drain plug on the bottom of the engine sump — this is usually a bolt with a hex head or a square socket. You will need to drain the old oil into a pan before removing the filter, because the filter itself holds roughly one quart of oil that will spill when you unscrew it. Place a drain pan underneath both the drain plug and the filter to catch all the old oil.

Steps to replace the filter

Start by warming the engine for two to three minutes at idle, then shut it off and wait five minutes. Warm oil flows more easily and drains more completely, but you want the engine cool enough to touch safely. Remove the drain plug by turning it counterclockwise with a wrench, and let the oil drain fully into your pan — this usually takes five to ten minutes.

Once the oil has stopped dripping, use an oil filter wrench to loosen the spin-on filter. Place the wrench around the filter body near the base, where the filter threads onto the engine, and turn counterclockwise. The wrench grips the cylindrical body of the filter, not the top cap. Once it is loose enough to turn by hand, unscrew it the rest of the way and set it aside in your drain pan to catch the remaining oil inside.

Wipe the filter mounting surface on the engine block with a clean rag to remove any dirt or old gasket material. explore a thin layer of new oil to the rubber gasket on the new filter — this helps create a watertight seal and makes removal easier next time. Thread the new filter onto the engine by hand until the gasket contacts the mounting surface, then turn it an additional three-quarter turn. Do not use the wrench to tighten it; hand-tight is correct.

Reinstall the drain plug and tighten it with a wrench. The plug should be snug but not over-tightened, which can strip the threads in the aluminum sump. Refill the engine with the correct grade and amount of oil — the X350 typically holds between 1.5 and 2 quarts depending on whether it has a single or twin-cylinder engine. Check your operator's manual for the exact capacity and the correct oil grade for your climate.

Oil grade and capacity for the X350

John Deere recommends SAE 10W-30 oil for the X350 in most climates. If you operate the tractor in temperatures below freezing, Deere allows SAE 0W-30 or 5W-30 for easier cold starting. In very hot climates, SAE 10W-40 is acceptable. Always use oil that meets the API SG rating or higher; this ensures the oil has the detergents and anti-wear additives the Kohler engine requires.

The X350 with a single-cylinder engine holds approximately 1.5 quarts of oil; the twin-cylinder model holds about 2 quarts. After you refill, start the engine and let it run for one minute, then shut it off and wait five minutes for the oil to settle. Check the dipstick or sight glass — the level should be at the full mark. Add a small amount more if needed, but do not overfill, because excess oil can damage the engine seals and cause leaks.

Disposal of old oil and the used filter

Old motor oil is classified as hazardous waste and cannot be poured down a drain or onto the ground. Most auto parts retailers, including NAPA, AutoZone, and Advance Auto Parts, accept used oil and filters for free. Many municipal recycling centers also have collection days or drop-off locations. Call ahead to confirm hours and whether they charge a fee; most do not.

The used filter should be drained before disposal. Puncture the top of the filter with a nail or drill bit and let it drain into your oil pan for several hours, or overnight if possible. Once drained, the filter can be recycled as scrap metal at most facilities. Some retailers will accept the filter along with the oil at no charge.

When to replace the filter

John Deere's maintenance schedule calls for an oil and filter change every 50 operating hours or once per season, whichever comes first. If you use the X350 for regular lawn mowing, that usually means one change per spring before the mowing season begins. If you operate the tractor year-round or in dusty conditions, you may need to change the filter more often — every 40 hours instead of 50.

Check the oil level every 10 operating hours by looking at the dipstick or sight glass. If the level drops noticeably between changes, the engine may have a leak or be burning oil, which should be inspected by a Deere dealer. A filter that clogs prematurely can also signal that the engine needs service.

Aftermarket filter options and cross-references

If you cannot find the AM125424 locally, several aftermarket filters fit the X350. Fram PH8A, Kohler 12 050 01-S, and Briggs & Stratton 492932S are common replacements that match the thread size and flow rating. Before you buy, confirm the thread pitch is 3/4-16 UNF (the standard for most small engines) and the diameter is approximately 3 inches. Retailers like Tractor Supply, Lowe's, and Amazon list cross-reference charts that show which filters are compatible.

Aftermarket filters are typically less expensive than OEM parts and perform adequately if they meet the same specifications. However, OEM filters are engineered specifically for the X350's cooling system and oil flow path, so they may offer slightly better protection. The choice depends on your budget and preference; either type will keep the engine clean if changed on schedule.

Frequently Asked Questions

Can I use a different oil filter if I cannot find the AM125424?

Yes, as long as the replacement has the same thread pitch (3/4-16 UNF), diameter (about 3 inches), and flow rating. Check the cross-reference chart on the retailer's website or call a Deere parts department to confirm compatibility before you buy. Using the wrong filter can cause leaks or restrict oil flow.

How often should I check the oil level between filter changes?

Check the dipstick or sight glass every 10 operating hours. The level should remain near the full mark. If it drops more than a quarter inch between changes, the engine may have a leak or be burning oil, which requires inspection by a technician.

What happens if I over-tighten the spin-on filter?

Over-tightening can damage the rubber gasket and make the filter difficult or impossible to remove next time without tearing. Hand-tight plus three-quarter turn is the correct torque. If you use a wrench, explore only light pressure — the gasket does the sealing, not brute force.

Can I change the oil without changing the filter?

Deere recommends changing both together every 50 operating hours. Changing only the oil leaves the old filter in place, which can recontaminate the fresh oil with particles and sludge. If you change the oil more often than the filter, you are wasting oil without gaining protection.

Where can I recycle the old oil and filter?

Auto parts retailers like NAPA, AutoZone, and Advance Auto Parts accept used oil and filters for free. Municipal recycling centers and some gas stations also have collection programs. Call ahead to confirm hours and whether they accept filters; most do at no charge.