The Yanmar 2310 Oil Filter (And the Aftermarket Filters Owners Are Actually Using)
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Pricing note: the prices and availability listed in this article are accurate as of May 2026 and are subject to change. Always check the retailer’s current price before buying.
If you own a Yanmar 2310, you’ve probably already learned the hard way: search for your oil filter at NAPA, AutoZone, Walmart, or O’Reilly and the lookup returns nothing, because the tractor isn’t in their catalogs. The Yanmar dealer can order the part for $20 and a week’s wait. The grey-market specialists online have it but charge shipping on top. The frustrating part isn’t the price; it’s that the filter you actually need is almost certainly already in stock at the local auto parts store, just catalogued under Honda, Kubota, or Komatsu. Here’s how to find it.
TL;DR
The Yanmar 2310 oil filter (OEM PN 124450-35110, superseded to 129150-35150) is almost impossible to buy outside the Yanmar dealer network and a handful of grey-market import specialists. The good news is that the filter itself isn’t proprietary. It’s a small spin-on canister (3.375″ tall × 2.687″ diameter, M20 × 1.5 thread) that shares its OEM spec with small Honda, Kubota, and John Deere engines of the same era. Yanmar 2310 owners on the major tractor forums have been physically test-fitting off-the-shelf alternatives for twenty years. Four come up repeatedly: STP S2808 and Mobil 1 M1-104A as drop-in matches to OEM size, Wix 51568 and NAPA Gold 1568 as taller capacity upgrades that still fit the housing.
About the Yanmar 2310
The Yanmar 2310 is a compact diesel tractor built in 1980 and 1981, powered by a three-cylinder 3T84H-S engine that produces around 27 engine horsepower (about 23 hp at the PTO). It was originally sold for the Japanese domestic market and imported to the US through grey-market channels rather than through Yanmar of America’s official catalog. The 4WD variant is the 2310D. Like most small Yanmar diesels of the era, the engine is overbuilt for its rated output, which is why so many of these tractors are still running forty years later, and why their owners are still buying filters for them. The catch is that “still running” doesn’t mean “still supported.” Yanmar of America never officially distributed parts for grey-market models, so the support chain has always been thin.
Why the OEM filter is so hard to find
The Yanmar 2310 was a grey-market import. Most units in the US arrived through unofficial channels in the 1980s and were never part of Yanmar of America’s North American catalog. As a result:
- Yanmar’s own dealer network sells the filter under PN 124450-35110 (superseded in current catalogs to 129150-35150), but pricing typically runs $15–$25 plus shipping, and many smaller Yanmar dealers don’t stock the older grey-market parts.
- The major auto-parts retailers (AutoZone, O’Reilly, NAPA, Walmart) don’t list “Yanmar 2310” in their fitment lookup at all. A counter clerk searching by tractor model gets no result. The same filter is in the building. It’s just catalogued under different vehicles.
- Specialty grey-market Yanmar resellers (Hoye Tractor, Fredricks Outdoor, others) carry the OEM Yanmar filter but charge a premium for the niche.
- Marine cross-references exist: Sierra Marine sells PN 18-7917 as a direct replacement for Yanmar 124450-35110 / 124550-35110 / 171056-35110, though most owners don’t think to check boat-supply retailers.
The practical effect: unless you want to wait a week and pay dealer pricing, the OEM filter isn’t really “available.” Owners have been working around this for decades.
What the OEM filter actually is
Before we talk about alternatives, here’s what we’re matching against:
| Spec | Value |
|---|---|
| Yanmar OEM PN | 124450-35110 |
| Current supersession | 129150-35150 |
| Style | Spin-on canister |
| Overall height | 3.375″ (3-3/8″) |
| Outside diameter | 2.687″ (2-11/16″) |
| Thread size | M20 × 1.5 (metric) |
| Anti-drainback valve | Yes |
| Bypass valve | Yes |
| OEM micron rating | 27 (nominal, coarser than most passenger-car filters) |
Source for these dimensions: cross-confirmed from three independent aftermarket replacement listings (Reliable Aftermarket Parts, Amazon “Spin-on Oil Filter Replaces 124450-35100,” BuyMachineryParts). All three publish identical figures for the Yanmar 124450-35110 / 129150-35150 family, with fitment specifically including the YM2310.
Why this matters: the Yanmar 2310 OEM oil filter is not a Yanmar-exclusive part. The current supersession PN (129150-35150) is also listed as the OEM filter for small Honda engines (Honda 15400-679-023, 15410-MJO-405), Kubota small engines (70000-15241), and several John Deere lawn tractor applications (AM100750, AM101378, M806418). The auto parts aisle has been stocking compatible filters all along. They were already made for Hondas and Kubotas, and they happen to fit the Yanmar housing because the spec was borrowed.
What 2310 owners have actually done
Yanmar 2310 owners have been working around the OEM scarcity problem since at least the early 2000s. The pattern in the forum record is consistent:
TractorByNet “2310 Oil filter cross reference” thread (2007 onward). The original poster physically test-fit four off-the-shelf filters on a 2610D (sibling tractor to the 2310, same engine family): Wix 51568, NAPA 1568 (~$12 at the time), an STP filter (~$3.49), and Mobil 1 M1-104 (~$9). All four threaded on correctly and sealed. Replies in the thread confirmed the same on YM2310 units. A longtime contributor pointed out the underlying reason: small Yanmar diesels under about 1.5 liters share oil-system design with the small Japanese gasoline engines of the era, so passenger-car filter specs cross over directly.
TractorByNet “Oil Filters” thread (2003). Earlier discussion specifically for the YM2310 recommended NAPA 1568 (the rebadged Wix 51568) as the standard substitute. The same thread noted that NAPA 1334 and NAPA 1344 also fit dimensionally. Both are taller variants in the same thread/gasket family, useful if you want more capacity.
Owner caveat on micron rating. In the same 2007 TBN thread, an experienced contributor argued that finer passenger-car filters like the Wix 51568 (21 micron, finer than the OEM’s 27) can be slightly too restrictive for low-rpm agricultural use, and suggested looking for filters with taller bodies to keep enough media area and flow through the service interval. (Lower micron number = finer filtration, so a “21” actually strains harder than the “27” OEM.)
Clearance warning from another Yanmar owner. A YM186D owner (same filter family) reported that an aftermarket power-steering installation reduced clearance around the filter housing enough to dent an oversized filter. The lesson: the Wix 51568 / NAPA Gold 1568 are taller than OEM by about 0.7″, and if your 2310 has any aftermarket front-end modifications, measure before committing.
Marine community confirms the cross. Sailboat-owner forums separately confirm that filters in this OEM family (the related 119305-35170 marine variant) cross to NAPA 1568, Fram 3593A, and Sierra 18-7917, useful corroboration that this is a well-established spec across applications.
The four aftermarket filters that fit
All four below thread on (M20 × 1.5) and seal correctly (gasket OD approximately 2.48″). The difference is in size: two match OEM dimensions, two are larger capacity upgrades.
Tier 1: OEM-sized drop-in replacements
STP S2808: 2.95″ tall × 3.16″ OD. A passenger-car filter in roughly OEM dimensions (a touch shorter than the Yanmar OEM, slightly fatter). Standard cellulose media, 15 micron rating, 15 PSI bypass, 256 PSI burst, anti-drainback valve. The budget pick. AutoZone SKU 61465. STP also sells an extended-life version (S2808XL, SKU 663639) with synthetic media for full-synthetic oil applications.
Mobil 1 M1-104A: 2.94–3.08″ tall × ~3.13″ OD (dimensions vary slightly across published sources). Closest match to OEM. Synthetic blend media, anti-drainback valve, advertised 9× operating-pressure burst rating. The “A” suffix is the current generation. The older “M1-104” (no suffix) was the prior generation and may still appear in older forum posts. AutoZone SKU 106102.
Tier 2: Capacity upgrade, about an inch taller than OEM
Wix 51568: 4.07″ tall × 3.234″ OD. About 0.7″ taller and 0.55″ wider than OEM. More media surface area, more dirt-holding before bypass. 21 micron cellulose, 16 PSI bypass, 320 PSI burst, anti-drainback valve. Wix lists this filter in its HD line, “designed for medium and heavy trucks, farm, construction, mining, and other equipment.” It was built for this kind of use, not adapted to it. Confirmed by multiple Yanmar 2310 owners to fit the housing, but check clearance to the steering linkage on any modified setup.
NAPA Gold 1568: the same filter as the Wix 51568. NAPA Gold has historically been Wix’s rebadge under NAPA’s house label; the spec sheets, dimensions, and burst rating match. Choose this if you’d rather buy at your local NAPA than order Wix online. NAPA SKU FIL 1568.
Fitment specs: side-by-side
| Spec | Yanmar OEM | Wix 51568 | NAPA 1568 | STP S2808 | Mobil 1 M1-104A |
|---|---|---|---|---|---|
| Thread | M20×1.5 | M20×1.5 | M20×1.5 | M20×1.5 | M20×1.5 |
| Height | 3.375″ | 4.07″ (+0.7″) | 4.07″ (+0.7″) | 2.95″ (-0.4″) | 2.94–3.08″ |
| OD | 2.687″ | 3.234″ (+0.55″) | 3.234″ (+0.55″) | 3.16″ (+0.47″) | ~3.13″ (+0.44″) |
| Gasket OD | matches family | 2.475″ | 2.475″ | 2.48″ | matches |
| Gasket ID | matches family | 2.173″ | 2.173″ | 2.24″ | matches |
Performance specs: side-by-side
| Spec | Yanmar OEM | Wix 51568 | NAPA 1568 | STP S2808 | Mobil 1 M1-104A |
|---|---|---|---|---|---|
| Bypass PSI | ~11–14 PSI* | 16 PSI | 16 PSI | 15 PSI | Yes |
| Anti-drain | Yes | Yes | Yes | Yes | Yes |
| Burst PSI | not pub. | 320 | 320 | 256 | “9× op.” |
| Micron | 27 | 21 | 21 | 15 | synthetic |
| Flow rate | not pub. | 9–11 GPM | 9–11 GPM | 15 GPM | not pub. |
| Media | Cellulose | Cellulose | Cellulose | Cellulose | Synth. blend |
| Interval | per manual | 3.75–10K mi / 12mo | 3.75–10K mi / 12mo | 3–5K mi (XL: 10K w/ synth.) | 20K mi / 12mo |
| Oil type | conv./synth. | conv./synth./blend | conv./synth./blend | all (XL: synth.) | synth. preferred |
*The OEM bypass setting isn’t published by Yanmar; ~11–14 PSI is the commonly cited figure for this filter family and should be treated as approximate.
Where to buy each filter
Prices below are approximate and accurate as of May 2026. Retail prices and availability change often and are subject to change. Always confirm the current price at the retailer before buying.
Wix 51568
| Retailer | Approx. Price | Notes |
|---|---|---|
| Amazon | Check current price | ASIN B00D0I98G6; Prime eligible |
| Walmart | ~$16.68 | Walmart item 113719078, single-pack |
| AutoZone | varies | In Wix catalog; check local store stock |
| O’Reilly Auto Parts | ~$25.99 | In-stock listing |
| NAPA | (sold as NAPA Gold 1568) | Same filter; see below |
| eBay | ~$15–$20 | Multiple sellers; Parts Mart and others |
| RockAuto | (in catalog) | Typical low-margin pricing site |
| Summit Racing | (in catalog) | Listed as WIX-51568 |
| USA Filter Store | (in stock) | Direct-from-distributor specialty site |
| FleetFilter | (in stock) | Wix/NAPA Gold specialty site |
| Great American | (in stock) | (fmr. Discount Fleet Supply) |
NAPA Gold 1568 (= Wix 51568)
| Retailer | Approx. Price | Notes |
|---|---|---|
| NAPA Auto Parts | varies by store | SKU FIL 1568; call for current price |
| eBay | ~$11.50–$28.00 | Multiple sellers, wide price spread |
| Amazon | Check current price | Third-party listings, ASIN B0722HYMKW |
| Online Filter Supply | (in stock) | Filter specialty site |
| Walmart | not typically | NAPA Gold is NAPA’s house brand |
| AutoZone | not stocked | Competing house brand |
STP S2808 (and STP S2808XL Extended Life)
| Retailer | Approx. Price | Notes |
|---|---|---|
| AutoZone | ~$5.99 / $9.99 XL | SKUs 61465 (S2808) / 663639 (S2808XL) |
| Walmart | varies | Walmart carries STP; SKU varies by store |
| Amazon | Check current price | Listed under “S2808 oil filter” |
| eBay | ~$4–$15 | Many private sellers; free shipping on most |
| NAPA | not typically | Competing house brand |
| O’Reilly | check store | STP carried at most O’Reilly locations |
Mobil 1 M1-104A
| Retailer | Approx. Price | Notes |
|---|---|---|
| Walmart | ~$11.97 single | Often the best price among majors; 6-pack ~$71 |
| AutoZone | ~$16.99–$18.99 | SKU 106102; price fluctuates |
| O’Reilly Auto Parts | ~$17.99–$18.99 | In stock at most locations |
| Amazon | Check current price | ASIN B072HK5THM; Amazon’s “Overall Pick”; Prime eligible |
| eBay | ~$16 + shipping | Lower availability than other retailers |
| NAPA | carries Mobil 1 brand | Verify specific filter SKU at local store |
How to choose between them
If you want OEM behavior, buy STP S2808 or Mobil 1 M1-104A. Both are within a few millimeters of the OEM filter’s external dimensions. They’ll thread into the original location without any clearance change. The Mobil 1 has synthetic media and a longer claimed service interval (20K mi / 12 months); the STP is the budget pick (around $6 at AutoZone for the standard, $10 for the synthetic-rated XL version).
If you want more capacity and have clearance, buy Wix 51568 or NAPA Gold 1568. They’re about an inch taller and half-inch wider than OEM. More media means more dirt-holding before bypass kicks in, and they’re rated for ag/industrial duty (Wix’s HD line is explicitly designed for “farm, construction, mining” use). On most 2310s the extra inch fits without trouble, but if your tractor has an aftermarket power steering kit or any frame modification near the filter housing, measure before committing.
How to verify any cross-reference before you buy
Three quick checks before you trust any filter cross-reference on a tractor:
- Thread size. The Yanmar 2310 housing uses M20 × 1.5 (metric). Every filter recommended here matches. If a parts counter offers you a 3/4-16 UNF filter (a common imperial spin-on spec), it’s the wrong filter, so don’t try to force it.
- Gasket diameter. The OEM gasket OD on this family is approximately 2.48″. The Wix 51568 is 2.475″, the STP S2808 is 2.48″, essentially identical. If you’re considering an off-list filter, measure your old filter’s seating gasket and compare.
- Bypass valve presence. A diesel tractor filter needs a working internal bypass. The 2310 OEM filter has one, and all four recommendations above include it. If you ever pick up a “compact” or generic filter at a discount, check the box. Filters without a bypass (some economy small-engine filters) will starve your engine on a cold start.
Quick FAQ
Will any “Yanmar” replacement at Tractor Supply also fit?
Probably, but the four recommendations above are dimensionally verified. The TSC house-brand filter is usually a rebadged off-the-shelf, so ask which OEM number it crosses to before buying.
Is the OEM Yanmar filter “better”?
Honest answer: it’s smaller capacity than the Wix 51568, the same dimensional class as the Mobil 1, and substantially more expensive than either. The argument for OEM is paint-color matching and the dealer relationship, not filtration.
How often should I change the oil filter on a 2310?
Per Yanmar’s service interval, but verify against the operator’s manual. With the smaller OEM-sized filters (STP/Mobil 1), don’t stretch the interval; with the larger Wix/NAPA, you have more margin.
Conclusion
The Yanmar 2310 oil filter problem isn’t really a parts problem. It’s a database problem. The filter you need has been sitting on auto parts shelves for years, just not under the name your local counter clerk can search. Now you know what to ask for: M20 × 1.5 thread, ~2.48-inch gasket, bypass valve included. Any of the four options above will work. Pull this article up on your phone at the parts counter if it helps.