Sylvia Mobil Delvac Syn Transmission 50 1 gal — full-synthetic GL-5 transmission & axle oil, long life and smooth shifting

Sylvia Mobil Delvac Syn Transmission 50 is a full-synthetic heavy-duty transmission and axle lubricant in a 1‑gallon container formulated for long life, smooth shifting, and thermal stability under high loads.

This full-synthetic transmission oil blends advanced base stocks with robust additives to meet the demands of commercial vehicles and off-highway equipment. It’s engineered to resist thermal breakdown, protect gears and bearings against wear, and maintain consistent viscosity across a wide temperature range. Use it where equipment manufacturers specify synthetic 75W-90/75W-140 equivalents or API GL-5 performance—particularly in harsh-service fleets, vocational trucks, and industrial gearboxes.

What performance benefits does this synthetic transmission fluid deliver?

Mobil Delvac Syn Transmission 50 provides durable protection and reliable shifting even under heavy loads and high operating temperatures. Its synthetic formulation reduces friction and wear while resisting oxidation that can thicken oils and form deposits.

• High thermal and oxidative stability for extended drain intervals
• Superior wear protection for gears and bearings
• Improved low-temperature pumpability compared with conventional oils
• Consistent viscosity to keep shift quality steady under load

Which vehicles and equipment can use this 1‑gallon product?

This lubricant suits heavy-duty on-road trucks, off-road construction equipment, agricultural machinery, and any transmissions or axles calling for an advanced synthetic GL-5-type oil. Always confirm manufacturer specs before changing fluids.

• Manual transmissions and differentials in commercial trucks
• Axles and final drives on construction and mining machines
• Equipment operating under frequent towing, hauling, or high-torque conditions
• Applications where extended drain intervals and synthetic benefits are desired

How should I change and store the fluid to get the best lifespan?

Follow equipment manufacturer drain intervals and service procedures to maximize performance and protection. Keep the container sealed and store in a cool, dry place away from direct sunlight to preserve additive integrity.

• Replace seals and gaskets if damaged during service
• Use clean funnels and avoid cross-contamination with other fluids
• Record fill dates to track drain intervals and maintenance history
• Store between recommended temperature ranges and away from moisture

Will switching to this synthetic oil affect seals or component compatibility?

Modern synthetic gear oils are formulated for compatibility with common elastomers and metals used in heavy-duty drivetrains, but check the equipment manual. If equipment has been running on legacy fluids for long periods, inspect seals and components during the first service after switching.

• Generally compatible with typical transmission and axle materials
• Perform a visual inspection after initial fill and first few operating hours
• Consult manufacturer approvals or technical data sheets for specific materials

Who is this for: Sylvia’s 1‑gallon Mobil Delvac Syn Transmission 50 is aimed at fleet managers, service technicians, and equipment owners who need a dependable, full-synthetic transmission/axle oil for heavy-duty applications. It’s ideal for those seeking extended drain capability, strong wear protection, and stable performance across varied operating temperatures—provided the vehicle or machine specifies a compatible synthetic GL-5-type product. If you operate trucks, construction machinery, or agricultural equipment under heavy loads, this formulation offers a modern synthetic option to help protect driveline components and maintain reliable operation.