{"product_id":"castrol-edge-high-mileage-5w-30-full-synthetic-motor-oil-5-quart-seal-conditioning-deposit-control","title":"Castrol EDGE High Mileage 5W-30 Full Synthetic Motor Oil, 5 Quart — Seal Conditioning \u0026 Deposit Control","description":"\u003cp\u003e\u003cstrong\u003eCastrol EDGE High Mileage 5W-30 is a full synthetic motor oil formulated for cars with over 75,000 miles to protect seals, reduce deposits, and support emission-system longevity.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eIf your vehicle has high mileage, internal wear and aging seals can lead to leaks, deposit buildup, and reduced performance. This Castrol EDGE High Mileage 5W-30 blends advanced synthetic base stocks with a proprietary additive package that targets seven critical protection areas, including corrosion prevention, sludge control, and timing-chain wear. It also uses Phosphorus Replacement Technology to lower phosphorus levels that can impair catalytic-converter function, helping maintain emissions-system performance as your engine ages.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this oil help prevent leaks and oil burnoff in older engines?\u003c\/h3\u003e\n\u003cp\u003eThe formulation includes seal-conditioning additives that help maintain elastomer flexibility and reduce shrinkage, which can cut down on leak paths around gaskets and seals. Enhanced shear stability and volatility control reduce oil consumption at high temperatures, lowering oil burnoff.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSeal conditioners to preserve rubber and reduce seepage\u003c\/li\u003e\n  \u003cli\u003eLow volatility base oils to minimize oil loss at operating temperatures\u003c\/li\u003e\n  \u003cli\u003eEnhanced film strength to resist thinning under load\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this oil protect internal components like timing chains and bearings?\u003c\/h3\u003e\n\u003cp\u003eYes — the oil’s additives are engineered to guard moving parts against friction-related wear. By maintaining a strong lubricating film and controlling deposits, it helps preserve timing-chain tensioners, cam lobes, bearings, and other wear-prone components common in high-mileage engines.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eAnti-wear additives for critical contact points\u003c\/li\u003e\n  \u003cli\u003eDeposit control to prevent varnish and sludge formation\u003c\/li\u003e\n  \u003cli\u003eConsistent viscosity retention to protect under stress\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does Phosphorus Replacement Technology affect my emissions system?\u003c\/h3\u003e\n\u003cp\u003eThis oil lowers traditional phosphorus content and replaces its functional role with alternative chemistries, reducing the risk of catalyst poisoning in older catalytic converters. The result is a formulation that supports emission control durability without sacrificing protective performance for high-mileage engines.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eReduced phosphorus to help protect catalytic converters\u003c\/li\u003e\n  \u003cli\u003eProprietary additives to maintain emission-system function\u003c\/li\u003e\n  \u003cli\u003eMeets modern industry specs to align with emission requirements\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow often should I change this oil and what specifications does it meet?\u003c\/h3\u003e\n\u003cp\u003eCastrol recommends change intervals up to 15,000 miles or one year, whichever comes first, depending on driving conditions and manufacturer guidance. This 5W-30 meets API SP and earlier API categories, ILSAC GF-6, and several OEM engine test requirements for broad compatibility.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eUp to 15,000 miles or one year under qualifying conditions*\u003c\/li\u003e\n  \u003cli\u003eMeets API SP\/SN PLUS\/SN\/SM and ILSAC GF-6\u003c\/li\u003e\n  \u003cli\u003eCompliant with Chrysler MS 6395 and Ford WSS-M2C946-B1, WSS-M2C961-A3\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cem\u003e*Actual oil change intervals depend on driving style, load, climate, and vehicle maker recommendations. Always follow your owner’s manual.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003cp\u003eWho is this for? Owners of cars, trucks, or SUVs that have surpassed roughly 75,000 miles and need a modern synthetic oil that addresses age-related issues. If you want improved seal protection, reduced deposit formation, emission-system-friendly chemistry, and a product that meets current industry and manufacturer specifications, this Castrol EDGE High Mileage 5W-30 in a 5-quart container is engineered for those priorities. It’s suited to vehicles requiring 5W-30 viscosity where enhanced high-mileage protection and up-to-date performance standards are desired.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is Castrol EDGE High Mileage 5W-30 suitable for vehicles with over 75,000 miles?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. It’s formulated specifically for engines over about 75,000 miles, with additives to reduce leaks, deposits, and wear.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I use this oil for extended oil change intervals?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: It supports up to 15,000 miles or one year in qualifying conditions, but follow your vehicle manufacturer’s interval recommendations.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Castrol","offers":[{"title":"Default Title","offer_id":48086273196190,"sku":"B01CRYHNI8","price":47.18,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/castrol-edge-high-mileage-front-label_b01a0f5f-46f2-45a1-a6c3-6489efe13dc7.jpg?v=1785893076","url":"https:\/\/northtrailauto.ca\/products\/castrol-edge-high-mileage-5w-30-full-synthetic-motor-oil-5-quart-seal-conditioning-deposit-control","provider":"North Trail Auto","version":"1.0","type":"link"}