Purpose and Specifications

LIQUI MOLY 25037 Marine Fully Synthetic Gear Oil GL4/GL5 75W-90 is a top-tier transmission oil in a convenient 250ml tube, perfect for marine gearboxes and high-stress manual transmissions. This fully synthetic formula delivers extreme protection under heavy loads and wild temperature swings, from freezing cold starts to scorching hot runs up to 150°C. It slashes wear, quiets noisy gears, and ensures buttery-smooth shifts by maintaining perfect thickness in all conditions.

• Key Benefits: Superior wear resistance, excellent corrosion protection, and high-pressure absorption keep your transmission running flawlessly for 100,000+ km or 5+ years with proper use.
• Works in extreme temps: Flows easy at -40°C for quick cold starts, stays thick at 150°C to prevent breakdown.
• Shelf life: 5 years unopened in cool, dry storage.

When to Use / Replace?

Use this oil in marine transmissions needing API GL4/GL5 or MT-1 specs, or ZF-approved manual gearboxes like TE-ML 02B/05A. Ideal for boats, high-performance vehicles, or any setup facing salt water, heavy towing, or temp extremes. Replace every 60,000-100,000 km or 3-5 years, or sooner if you notice hard shifting, grinding noises, or leaks—whichever comes first.

FAQ

Q: Is this safe for my boat's transmission? A: Yes, it's specially made for marine use with GL4/GL5 ratings, protecting against saltwater corrosion and extreme loads.

Q: How often should I change it? A: Every 60,000 km or 3 years in normal use; check your manual for exact intervals.

Q: Will it quiet down a noisy gearbox? A: Absolutely—its additives reduce friction and noise for smoother, quieter operation.