Castrol Heavy-Duty Transmission Fluid

Brand: Castrol | Part #OIL-91D185

Category: Oil & Fluids > Transmission Fluid

The Castrol Heavy-Duty Transmission Fluid (P/N OIL-91D185) is a direct-fit Transmission Fluid for the vehicles listed in the fitment section. Formulated to meet current OEM service-fill specifications, with a stable viscosity profile across cold-start and hot operating ranges. Sourced from Castrol, a recognized supplier in the aftermarket auto parts channel. Part number OIL-91D185 is the manufacturer reference — match it against your old part or VIN-based lookup to confirm you have the right unit. Confirmed fitment on 2015–2024 Dodge, Acura, RAM, Buick including Hornet, Integra, TLX, ProMaster City, 2500, 1500. Use the year/make/model selector above to verify your exact configuration before checkout. Ships from a US warehouse in 1–2 business days. Free shipping on orders $75+, flat-rate ground otherwise. 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: $12.99 | In stock — ships within 1-2 business days. Free shipping on orders over $75.