{"product_id":"wix-oil-filter-51344-cummins-onan-185-5835","title":"WIX Oil Filter 51344 – Cummins Onan Generator (185-5835)","description":"\u003ch2\u003eWIX Oil Filter 51344 – Cummins Onan Generator (185-5835)\u003c\/h2\u003e\u003cp\u003eThe WIX 51344 is a full-flow spin-on oil filter commonly used as an aftermarket replacement for Cummins Onan oil filter \u003cstrong\u003e185-5835\u003c\/strong\u003e. It is designed to remove damaging contaminants from generator engine oil while maintaining dependable lubrication flow during startup and normal operation.\u003c\/p\u003e\u003cp\u003eThis heavy-duty filter uses enhanced-cellulose media, an M20 × 1.5 mounting thread, an anti-drainback valve, and an internal bypass valve. Its approximately 4.07-inch body closely matches the original long-format filter used on select Cummins Onan marine diesel generator sets.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e WIX lists 51344 as discontinued as of October 2025. Stock on hand may be limited. Any replacement should be matched to the original Onan 185-5835 specification — see the cross-reference list below for alternatives.\u003c\/p\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eDirect aftermarket replacement commonly associated with Onan 185-5835\u003c\/li\u003e\n\u003cli\u003eFull-flow spin-on lubricating oil filter\u003c\/li\u003e\n\u003cli\u003eEnhanced-cellulose filtration media\u003c\/li\u003e\n\u003cli\u003eNominal filtration rating: 21 microns\u003c\/li\u003e\n\u003cli\u003eThread size: M20 × 1.5\u003c\/li\u003e\n\u003cli\u003eHeight: approximately 4.07 in \/ 103.4 mm\u003c\/li\u003e\n\u003cli\u003eOutside diameter: approximately 3.24 in \/ 82.3 mm\u003c\/li\u003e\n\u003cli\u003eRated flow range: 9–11 GPM\u003c\/li\u003e\n\u003cli\u003eBypass-valve setting: 8–11 psi\u003c\/li\u003e\n\u003cli\u003eIntegrated anti-drainback valve\u003c\/li\u003e\n\u003cli\u003eBurst-pressure rating: approximately 360 psi\u003c\/li\u003e\n\u003cli\u003eAttached sealing gasket\u003c\/li\u003e\n\u003cli\u003eWIX Part Number: 51344\u003c\/li\u003e\n\u003cli\u003eUPC: 765809513440\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eGenerator Compatibility\u003c\/h3\u003e\u003cp\u003eThe Onan 185-5835 oil filter specification is commonly associated with select Cummins Onan marine diesel generator models, including MDKAL, MDKAV, MDKAW Spacesaver, MDKAZ, MDKBG, and certain related MDK-series configurations. Additional application references associate this filter with select HDKAG, HDKAR, and HDKAQ generator sets. Exact compatibility depends on the complete generator model, specification letter, and engine configuration.\u003c\/p\u003e\u003ch3\u003eFitment Notice\u003c\/h3\u003e\u003cp\u003eConfirm the complete Cummins Onan generator model, specification letter, and serial number before ordering. Similar MDK-series generators may use different oil filters depending on production date, engine version, and filter-head arrangement. Do not select a replacement solely because it uses an M20 × 1.5 thread — the filter length, gasket dimensions, bypass pressure, and anti-drainback-valve configuration must also match the generator’s lubrication system.\u003c\/p\u003e\u003ch3\u003eWhen to Replace\u003c\/h3\u003e\u003cp\u003eReplace the oil filter whenever the generator oil is changed or at the service interval listed in the applicable Cummins Onan maintenance manual. Earlier replacement may be appropriate following extended operation under heavy electrical load, frequent short generator cycles, fuel, coolant or moisture contamination, long periods of seasonal storage, internal engine repairs, or abnormal oil pressure. Replace any filter that is dented, heavily corroded, or leaking.\u003c\/p\u003e\u003ch3\u003eInstallation Notes\u003c\/h3\u003e\u003cp\u003eShut down the generator, allow it to cool, and follow the manufacturer’s lockout and service procedures before beginning work. Remove the old filter and confirm its gasket has not remained on the filter head. Clean the sealing surface, lightly lubricate the new gasket with clean engine oil, and install by hand to the manufacturer’s tightening specification. After installation: refill with the specified grade and quantity of oil, run the generator and verify normal oil pressure, inspect for leakage, shut down and allow oil to settle, then recheck and correct the oil level. Note that the correct bypass-valve specification is important — an improperly matched filter can restrict lubrication during cold starts or when the media becomes loaded.\u003c\/p\u003e\u003ch3\u003eCross-Reference Numbers\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eCummins Onan 185-5835 \/ 0185-5835\u003c\/li\u003e\n\u003cli\u003eFleetguard LF3536\u003c\/li\u003e\n\u003cli\u003eBaldwin B161-S\u003c\/li\u003e\n\u003cli\u003eDonaldson P550162\u003c\/li\u003e\n\u003cli\u003eSierra 23-7842 \/ 47-237842\u003c\/li\u003e\n\u003cli\u003eNAPA Gold 1344\u003c\/li\u003e\n\u003cli\u003eLuber-finer PH2808\u003c\/li\u003e\n\u003cli\u003eFRAM PH5317\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eCross-reference numbers are comparison aids only. Confirm the original filter number and generator application before substituting brands. Given the WIX 51344 discontinuation, the cross-references above may be useful for sourcing an equivalent replacement.\u003c\/p\u003e\u003ch3\u003eOther WIX Filters\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/wix-oil-filter-51358-yanmar\"\u003eWIX Oil Filter 51358 – Yanmar Marine Diesel\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/wix-oil-filter-51365-honda-tohatsu-yanmar\"\u003eWIX Oil Filter 51365 – Honda Marine, Tohatsu \u0026amp; Yanmar\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/wix-oil-filter-51515-ford\"\u003eWIX Oil Filter 51515 – Ford Marine\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/wix-oil-filter-51806\"\u003eWIX Oil Filter 51806\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/wix-oil-filter-51361-nissan-kubota\"\u003eWIX Oil Filter 51361 – Nissan, Infiniti \u0026amp; Kubota\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eParts Desk Insights\u003c\/h3\u003e\u003cp\u003eThe important detail with this filter is the bypass-valve setting — many M20 × 1.5 filters will physically thread onto the engine, but that does not make them correct for a Cummins Onan generator. Matching the Onan part number \u003cstrong\u003e185-5835\u003c\/strong\u003e, the full generator model, and its specification letter is the safer approach. With WIX 51344 now discontinued, the cross-references above (particularly Fleetguard LF3536 and Baldwin B161-S) are worth investigating as long-term alternatives. Contact us if you need help identifying a suitable replacement.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eShipping:\u003c\/strong\u003e Ships same or next day for fast Canada-wide shipping. ⚓\u003c\/p\u003e","brand":"NSP","offers":[{"title":"Default Title","offer_id":43563952209956,"sku":"51344","price":33.96,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/c7d9d977-bf5e-486f-98ef-b6d46f6df55d.png?v=1784313699","url":"https:\/\/marisolmarine.com\/products\/wix-oil-filter-51344-cummins-onan-185-5835","provider":"Marisol Marine Company","version":"1.0","type":"link"}