{"product_id":"amsoil-asf-15-oil-filter-ford-fl1a","title":"AMSOIL ASF-15 Oil Filter – Ford FL-1A Family (Legacy)","description":"\u003ch2\u003eAMSOIL ASF-15 Oil Filter – Ford FL-1A Family (Legacy)\u003c\/h2\u003e\u003cp\u003eThe AMSOIL ASF-15 is a legacy, long-format spin-on oil filter designed for full-flow engine lubrication service. It removes abrasive contaminants from circulating oil while maintaining the flow needed to protect bearings, journals, and other internal engine components.\u003c\/p\u003e\u003cp\u003eASF-15 belongs to the widely used Ford FL-1A filter family. Legacy references identify a 3\/4\"-16 mounting thread, an approximate height of 5.16 inches, and an outside diameter of approximately 3.82 inches. It was followed by the AMSOIL SDF15 and later EAO15 filter designations.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e ASF-15 is a discontinued legacy AMSOIL part number. If you are sourcing a replacement for an engine returning to service, a fresh current-production equivalent (such as the \u003ca href=\"\/products\/wix-oil-filter-51515-ford\"\u003eWIX 51515\u003c\/a\u003e or Motorcraft FL-1A) is normally the safer choice — old-stock filters may have aged or hardened sealing gaskets regardless of physical appearance.\u003c\/p\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eFull-flow spin-on engine oil filter\u003c\/li\u003e\n\u003cli\u003eLegacy AMSOIL Super Duty filter\u003c\/li\u003e\n\u003cli\u003eLong-format filter body for increased filtration capacity\u003c\/li\u003e\n\u003cli\u003eThread size: 3\/4\"-16\u003c\/li\u003e\n\u003cli\u003eApproximate height: 5.16 in \/ 131 mm\u003c\/li\u003e\n\u003cli\u003eApproximate outside diameter: 3.82 in \/ 97 mm\u003c\/li\u003e\n\u003cli\u003eCommonly associated with the Ford FL-1A filter specification\u003c\/li\u003e\n\u003cli\u003eDesigned for gasoline, diesel, and heavy-duty applications using the corresponding filter head\u003c\/li\u003e\n\u003cli\u003eLegacy AMSOIL part number: ASF-15\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eEngine Compatibility\u003c\/h3\u003e\u003cp\u003eThe ASF-15 cross-references to the Ford FL-1A and \u003ca href=\"\/products\/wix-oil-filter-51515-ford\"\u003eWIX 51515\u003c\/a\u003e filter family. This filter specification is associated with a broad range of older Ford engines and related equipment, including:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFord 289 and 302 \/ 5.0L V8 engines\u003c\/li\u003e\n\u003cli\u003eFord 351 \/ 5.8L V8 engines\u003c\/li\u003e\n\u003cli\u003eFord 390, 427, 428, 429, and 460 V8 applications\u003c\/li\u003e\n\u003cli\u003eChrysler, Mazda, Toyota Land Cruiser, and heavy-equipment applications\u003c\/li\u003e\n\u003cli\u003eFord-based inboard and sterndrive marine engine installations\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eThe current \u003ca href=\"\/products\/wix-oil-filter-51515-ford\"\u003eWIX 51515\u003c\/a\u003e equivalent uses a 3\/4\"-16 thread, measures approximately 5.20 inches high, and includes an 8–11 psi bypass valve and anti-drainback valve.\u003c\/p\u003e\u003ch3\u003eFitment Notice\u003c\/h3\u003e\u003cp\u003eConfirm the number printed on the existing filter and verify the engine model, serial number, and filter-head configuration before ordering. Many filters use the same 3\/4\"-16 mounting thread — a filter that screws onto the engine may still have an incorrect gasket diameter, bypass-valve setting, anti-drainback arrangement, or body length. Marine engines may also have remote-filter adapters or restricted installation clearance. Because ASF-15 is a discontinued legacy number, confirm that any modern replacement matches the engine application rather than relying only on a cross-reference chart.\u003c\/p\u003e\u003ch3\u003eWhen to Replace\u003c\/h3\u003e\u003cp\u003eReplace the oil filter whenever the engine oil is changed or at the interval specified by the engine manufacturer. Earlier replacement may be appropriate following extended trolling or low-speed operation, heavy-load or high-temperature use, fuel, coolant, water or debris contamination, long periods of seasonal storage, internal engine repairs, or abnormal oil-pressure conditions. Do not install an old-stock filter if its gasket has hardened, its body is corroded or dented, or its storage history is unknown.\u003c\/p\u003e\u003ch3\u003eInstallation Notes\u003c\/h3\u003e\u003cp\u003eRemove the existing filter and confirm its sealing gasket has not remained on the filter head. Clean the mounting surface and compare the new filter’s thread, gasket, and overall dimensions with the removed filter. Lightly coat the new gasket with clean engine oil and install by hand to the manufacturer’s tightening specification — do not overtighten. After installation: refill with the specified oil, start the engine and confirm normal oil pressure, inspect for leakage, shut down and allow oil to settle, then recheck and correct the oil level.\u003c\/p\u003e\u003ch3\u003eCross-Reference \u0026amp; Superseded Part Numbers\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eAMSOIL ASF15 \/ ASF-15 (legacy)\u003c\/li\u003e\n\u003cli\u003eAMSOIL SDF15 (successor)\u003c\/li\u003e\n\u003cli\u003eAMSOIL EAO15 (current)\u003c\/li\u003e\n\u003cli\u003eMotorcraft FL-1A\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/wix-oil-filter-51515-ford\"\u003eWIX 51515\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003eNAPA Gold 1515\u003c\/li\u003e\n\u003cli\u003eBaldwin B2\u003c\/li\u003e\n\u003cli\u003eDonaldson P550008\u003c\/li\u003e\n\u003cli\u003eFleetguard LF3313\u003c\/li\u003e\n\u003cli\u003eFRAM PH8A\u003c\/li\u003e\n\u003cli\u003ePurolator L30001\u003c\/li\u003e\n\u003cli\u003eFord CM-6731-FL1A\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eCross-reference numbers are comparison aids only. Confirm the original application and internal filter specifications before substituting brands.\u003c\/p\u003e\u003ch3\u003eParts Desk Insights\u003c\/h3\u003e\u003cp\u003eASF-15 is an older AMSOIL number for the familiar Ford FL-1A-size filter. The main concern with old stock is not simply whether it fits — the age and condition of the sealing gasket also matters. For an engine returning to service, a fresh current-production equivalent such as the \u003ca href=\"\/products\/wix-oil-filter-51515-ford\"\u003eWIX 51515\u003c\/a\u003e or Motorcraft FL-1A is normally the safer choice. If you specifically need the AMSOIL product line, the current designation is \u003cstrong\u003eEAO15\u003c\/strong\u003e.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eShipping:\u003c\/strong\u003e Ships same or next day for fast Canada-wide shipping. ⚓\u003c\/p\u003e","brand":"MISC.","offers":[{"title":"Default Title","offer_id":43563933532196,"sku":"ASF-15","price":17.64,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/b3fa938a-7d3e-4806-8dc8-9cba177d107a.png?v=1784321516","url":"https:\/\/marisolmarine.com\/products\/amsoil-asf-15-oil-filter-ford-fl1a","provider":"Marisol Marine Company","version":"1.0","type":"link"}