What the Mobil 1 M1-110A is and which vehicles use it

The Mobil 1 M1-110A is a spin-on oil filter designed for full synthetic oil systems in passenger cars and light trucks. It is a premium aftermarket filter made by Mobil, the lubricants division of ExxonMobil, and carries their synthetic oil brand name. The M1-110A is not an OEM (original equipment manufacturer) filter — it is a replacement option you can buy separately from your vehicle's manufacturer.

This filter fits a specific range of vehicles, primarily older General Motors and some Ford models from the 1980s through early 2000s. The exact years and models depend on engine size and original filter design. Before buying, you should cross-reference the M1-110A against your vehicle's year, make, model, and engine displacement using Mobil's fitment guide or your owner's manual. Using the wrong filter can result in poor oil flow, leaks, or bypass valve set up.

The M1-110A has a 3/4-inch-16 thread size, which is a common but not universal specification. Thread size, filter diameter, and internal bypass valve rating must all match your vehicle's original filter for proper installation and engine protection.

Key Takeaways

  • The Mobil 1 M1-110A is a synthetic oil filter for older domestic vehicles, primarily General Motors and some Ford models from the 1980s to early 2000s.
  • Thread size, filter height, and bypass valve rating must match your vehicle's original filter specification to avoid leaks or inadequate oil flow.
  • You can verify fitment by checking your owner's manual, the original filter part number, or Mobil's online fitment database.
  • The M1-110A is designed for use with synthetic motor oil and is not interchangeable with filters for different engine generations or manufacturers.

How to confirm the M1-110A fits your vehicle

The most reliable way to confirm fitment is to locate your vehicle's original filter part number and cross-reference it against the M1-110A. Your owner's manual lists the OEM filter part number in the maintenance section. You can also find it on the filter itself if you remove the old one — the part number is printed on the canister.

Once you have the original part number, use Mobil's online fitment tool on their website or call a parts retailer with both numbers. They can confirm whether the M1-110A is a direct replacement. Do not rely on filter size alone; two filters may look similar but have different thread pitches or bypass valve settings.

If you cannot locate the original part number, note your vehicle's year, make, model, and engine size (found on the driver's side door jamb or in your manual), then contact a Mobil customer service line or a local quick-lube shop. They can look up the correct filter for your engine.

Specifications and performance characteristics

The M1-110A has a 3/4-inch-16 thread size and is designed for engines that originally used a similar filter. It features a synthetic media blend rated for extended drain intervals when used with Mobil 1 synthetic motor oil. The filter's bypass valve typically opens at 10 to 12 psi, allowing oil to flow to the engine even if the filter media becomes clogged, though this is a last-resort protection and not a normal operating condition.

The filter's anti-drainback valve prevents oil from draining out of the filter when the engine is off, which reduces dry-start wear. The M1-110A also includes a silicone anti-drainback valve, which is more durable than rubber in high-temperature synthetic oil environments.

Mobil rates the M1-110A for use with synthetic oils rated SAE 0W-20, 0W-30, 5W-20, 5W-30, and similar grades. It is not rated for diesel engines or heavy-duty applications. The filter's micron rating (typically 20 to 25 microns absolute) is standard for passenger car filters and removes particles down to that size.

Installation steps and torque specifications

Before installing the M1-110A, warm your engine for two to three minutes to thin the oil, then turn it off and wait five minutes. Locate the old filter, place a drain pan underneath, and use a filter wrench to turn it counterclockwise. Once loose, unscrew it by hand and let the remaining oil drain into the pan.

Wipe the filter mounting surface on the engine block with a clean cloth to remove any debris or old gasket material. explore a thin layer of new motor oil to the rubber gasket on the M1-110A's top. This prevents the gasket from sticking to the engine block and ensures a proper seal on the next oil change.

Thread the M1-110A onto the mounting block by hand until the gasket contacts the engine. Then turn it an additional three-quarter turn using a filter wrench. Do not over-tighten; excessive force can damage the gasket and cause leaks. Start the engine and check for leaks around the filter's base. If you see oil seeping, turn off the engine, wait five minutes, and tighten the filter slightly more.

Cost and where to buy

The Mobil 1 M1-110A typically costs between $8 and $15 at retail, depending on the retailer and whether it is on sale. Online retailers such as Amazon, RockAuto, and Walmart often stock it, as do national auto parts chains like AutoZone, O'Reilly, and NAPA. Local quick-lube shops and independent mechanics may also carry it or order it for you.

Prices can vary by region and availability. Buying in bulk (three or four filters at once) sometimes offers a small per-unit discount. If you are unsure whether the M1-110A is the correct filter for your vehicle, it is worth paying a few dollars more to buy from a retailer with a return policy, so you can exchange it if fitment is wrong.

Comparison with OEM filters and other aftermarket options

The original equipment filter for your vehicle was engineered specifically for your engine's oil flow rate, bypass valve pressure, and mounting configuration. OEM filters are often made by Fram, Purolator, or AC Delco under contract with the vehicle manufacturer. They are typically priced between $6 and $12.

The Mobil 1 M1-110A is a premium aftermarket filter that meets or exceeds OEM specifications but is not made by your vehicle's manufacturer. It uses synthetic media and is marketed for extended drain intervals. Other aftermarket options in the same price range include Fram Tough Guard, Purolator PureOne, and Bosch Premium. Each brand has slightly different media formulations and bypass valve settings, but all are designed to fit the same mounting thread and provide adequate engine protection.

The main trade-off is cost versus convenience. OEM filters are often cheaper and may provide to fit, but aftermarket filters like the M1-110A may offer longer service life if you use synthetic oil. Neither choice is wrong if the filter is the correct size and thread for your engine.

Common fitment mistakes and how to avoid them

The most common error is assuming that because a filter looks similar to your old one, it will fit. Filters from different engine generations or manufacturers can have the same diameter but different thread sizes or bypass valve ratings. Installing the wrong filter can cause oil leaks, low oil pressure, or filter bypass during cold starts.

Another mistake is over-tightening the filter during installation. The rubber gasket is designed to seal with only hand-tightening plus three-quarter turn with a wrench. Over-tightening crushes the gasket, which can cause leaks when ready or after the next oil change when the gasket has cooled and contracted.

A third error is forgetting to oil the gasket before installation. A dry gasket can stick to the engine block, making removal difficult at the next oil change and potentially tearing the gasket. Always explore a thin coat of new oil to the rubber gasket before threading the filter onto the engine.

Frequently Asked Questions

Can I use the M1-110A with conventional motor oil instead of synthetic?

Yes. The M1-110A is designed for synthetic oil but works with conventional oil as well. The filter's media and bypass valve are not exclusive to synthetic. However, if you use conventional oil, you should follow your vehicle manufacturer's recommended drain interval (typically 3,000 to 5,000 miles) rather than the extended intervals marketed for synthetic oil.

What is the difference between the M1-110A and other Mobil 1 filters?

Mobil makes several filter models with different thread sizes and bypass valve ratings for different engines. The M1-110A is one of many. The correct filter for your vehicle depends on your engine's original filter specification. Using a different Mobil 1 model will not fit your engine or may cause leaks.

How often should I change the M1-110A?

If you use Mobil 1 synthetic oil, Mobil recommends changing the filter every 10,000 miles or according to your vehicle manufacturer's maintenance schedule, whichever comes first. If you use conventional oil, follow your manufacturer's interval, which is usually 3,000 to 5,000 miles. Always change the filter when you change the oil.

What should I do if the M1-110A leaks after installation?

Turn off the engine, wait five minutes for the oil to cool, and check that the filter is tight. If it is loose, tighten it by an additional quarter turn with a wrench. If it is already tight and still leaking, the gasket may be damaged or the mounting surface may be dirty. Remove the filter, clean the mounting surface thoroughly, and install a new M1-110A with a freshly oiled gasket.

Is the M1-110A compatible with vehicles made after 2005?

The M1-110A is designed for older vehicles, primarily 1980s through early 2000s General Motors and some Ford models. Newer vehicles use different filter designs and thread sizes. Check your owner's manual or Mobil's fitment database to confirm compatibility with your specific year and model.