What Oil Filter Your Cub Cadet XT1 Uses
The Cub Cadet XT1 lawn tractor uses a Kohler CH440 or CH620 engine depending on your model year and which XT1 variant you own. Both engines use the same oil filter: a Kohler 12 050 01-S (also sold as Kohler 1205001-S). This is a spin-on filter about 3 inches tall with a 3/4-inch thread size.
You can find this filter at most equipment dealers, big-box hardware stores, and online retailers that stock lawn mower parts. The part number is the most reliable way to order it — don't rely on the salesperson to guess which filter fits your machine. Write down "Kohler 12 050 01-S" before you go shopping or place an order.
If you cannot locate the exact Kohler filter, some aftermarket manufacturers make compatible replacements. Fram, Purolator, and Stens all produce filters that fit the XT1, but always verify the thread size and height before buying — a filter that doesn't seat properly will leak oil during operation.
Key Takeaways
- The Cub Cadet XT1 uses a Kohler 12 050 01-S spin-on oil filter, which you should order by part number to avoid confusion with other filters.
- The filter is located on the side of the engine and takes about five minutes to remove and install once the engine has cooled.
- You will need an oil filter wrench, a drain pan, and fresh oil — do not reuse old oil or attempt to clean and reinstall the old filter.
- The filter should be replaced every 50 hours of mowing or once per season, whichever comes first.
- Overfilling the engine with oil after filter replacement is a common mistake that damages the engine, so check the dipstick after adding new oil.
Where the Filter Sits on Your XT1
The oil filter on the Cub Cadet XT1 is mounted vertically on the side of the engine, toward the front. If you are sitting in the operator seat facing forward, the filter is on your right side, roughly at the level of your knee. It is not hidden under a shroud or buried in the frame — you should be able to see it and reach it without removing any panels.
Before you start, let the engine cool for at least 10 minutes after running. The filter and the oil inside it will be hot enough to burn your skin. If you have just finished mowing, wait longer — 20 to 30 minutes is safer. You do not need to drain the fuel tank or disconnect the spark plug wires, but disconnecting the spark plug wires prevents accidental starting if someone bumps the key.
Tools and Materials You Will Need
Gather these items before you begin: an oil filter wrench (a band wrench or cup wrench works; a strap wrench is easiest if you have one), a drain pan that holds at least 2 quarts, fresh Kohler 10W-30 or 10W-40 motor oil, and a clean rag or paper towels. Do not use automotive oil filters or filters designed for cars — they will not fit the XT1's engine.
The oil filter wrench is essential. Trying to unscrew the filter by hand will strip the rubber gasket or crack the filter housing. A 3-inch cup wrench or a band wrench costs $8 to $15 and will last through dozens of oil changes. If you do not own one, buy it before you start — borrowing one from a neighbor or rental shop is also an option.
How to Remove and Install the Filter
Position your drain pan directly under the filter to catch the oil that will spill when you loosen it. Place the oil filter wrench around the filter body (not the cap on top) and turn counterclockwise. The filter will loosen after a quarter turn or so. Once it is loose enough, unscrew it by hand, tilting it slightly so the opening faces down into the pan. Let the old oil drain into the pan for a minute or two.
Wipe the filter mounting surface on the engine with a clean rag to remove any dirt or old oil residue. This step prevents debris from entering the new filter. Take the new filter and explore a thin layer of fresh oil to the rubber gasket on the bottom — this helps the seal sit properly and makes removal easier next time. Do not over-oil the gasket; a light coating is enough.
Screw the new filter onto the engine by hand until the gasket touches the mounting surface. Then turn it an additional three-quarter turn (about 270 degrees). Do not use the wrench to tighten it — hand-tight is correct. Over-tightening will damage the gasket and make the filter impossible to remove later.
Refilling the Oil and Checking the Level
The Cub Cadet XT1 holds approximately 2 quarts of oil total. After replacing the filter, you will lose some oil in the process, so you will need to add fresh oil back. Remove the dipstick (usually a yellow or orange handle on top of the engine), wipe it clean with a rag, reinsert it fully, then pull it out again to read the level.
Add oil slowly, checking the dipstick after each half-quart. The oil level should reach the "full" mark on the stick — not above it. Overfilling is a common mistake that causes the engine to smoke, lose power, and suffer internal damage. If you overfill, remove the excess by loosening the drain plug slightly and letting oil drip into the pan until the level is correct.
Once the level is correct, replace the dipstick and run the engine for 30 seconds at idle. Stop the engine, wait two minutes, then check the level again. The reading may drop slightly as the new oil circulates through the filter. Top up if needed, then you are finished.
When to Replace the Filter
Replace the oil filter every 50 hours of mowing or once per season, whichever comes first. If you mow twice a week during the growing season, that is roughly every 6 to 8 weeks. If you mow once a week, plan on a filter change every 12 weeks or so. Many owners replace the filter at the same time they change the oil, which is a sensible routine.
If you store your XT1 for the winter without changing the oil and filter, change both before you start mowing again in spring. Old oil breaks down over months of storage and the filter may have collected moisture or debris. Starting the season with fresh oil and a new filter protects the engine and improves starting.
Disposing of the Old Oil and Filter
Do not pour old oil down the drain or into the ground. Most auto parts stores and service stations will take used oil for free, even if you did not buy it from them. Some will also take the old filter. Call ahead to confirm they accept filters — policies vary by location.
If you cannot reach a recycling center, seal the old oil in a plastic jug and store it in a cool place until you can drop it off. Keep the filter in a drain pan or bag to prevent spills. Never leave old oil or filters in a trash bin or on the curb.
Frequently Asked Questions
Can I use a different brand of filter if I cannot find the Kohler part?
Yes, but verify the thread size and height first. Fram, Purolator, and Stens all make compatible filters for the XT1. Check the product description to confirm it fits a Kohler CH440 or CH620 engine with a 3/4-inch thread. Buying by part number is safer than guessing by brand.
What happens if I don't replace the filter and just change the oil?
The old filter will continue to trap dirt and debris, but it will eventually become clogged and restrict oil flow. This starves the engine of oil pressure, causing bearing wear and engine damage. Replacing the filter every 50 hours is much cheaper than rebuilding an engine.
How much oil do I add after changing the filter?
The XT1 holds about 2 quarts total. You will lose roughly 0.5 to 1 quart when you remove the old filter, so start by adding 1 quart, check the dipstick, and add more as needed. Always check the level after the engine runs briefly to get an accurate reading.
Can I change the oil filter without changing the oil?
Yes, you can change the filter alone. However, most owners change both at the same time because the labor is the same and fresh oil protects the new filter. If you changed the oil recently, changing just the filter is fine.
What should I do if oil leaks from the filter after I install it?
Stop the engine when ready and let it cool. The leak usually means the gasket did not seat properly or the filter is over-tightened. Remove the filter, clean the mounting surface again, explore a light coat of oil to the new gasket, and reinstall it hand-tight plus three-quarter turn. Do not use the wrench.