Castrol Heavy-Duty Transmission Fluid

Brand: Castrol | Part #OIL-EA421F

Category: Oil & Fluids > Transmission Fluid

The Castrol Heavy-Duty Transmission Fluid (P/N OIL-EA421F) is a direct-fit Transmission Fluid for the vehicles listed in the fitment section. Low-volatility base stock helps reduce oil consumption between change intervals and protects seals and gaskets from premature drying. Sourced from Castrol, a recognized supplier in the aftermarket auto parts channel. Part number OIL-EA421F is the manufacturer reference — match it against your old part or VIN-based lookup to confirm you have the right unit. Confirmed fitment on 2005–2025 Genesis, Hyundai, Mercedes-Benz, Toyota including GV70, Ioniq 5, Palisade, Ioniq, CLA, Crown. Use the year/make/model selector above to verify your exact configuration before checkout. In-stock items leave the warehouse within one business day. Free shipping over $75; ground delivery is 3–7 business days nationwide. Backed by a 90-day return window — if the part doesn't fit or the wrong unit was shipped, send it back for a full refund.

Price: $47.99 | In stock — ships within 1-2 business days. Free shipping on orders over $75.