Star Brite Synthetic Blend 80W90 Lower Unit Gear Lube, 1 Gallon – 27200
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Star Brite Synthetic Blend 80W90 Lower Unit Gear Lube – 1 Gallon | Part #27200
A synthetic-blend 80W90 gear lubricant formulated for outboard and sterndrive lower units, particularly those on higher-horsepower engines. The synthetic base stock delivers better film strength and thermal stability than conventional mineral oils, while the blend pricing keeps it accessible for regular service intervals. This is a gallon jug — the right size for shops, multi-boat owners, or anyone who services their lower unit more than once a season.
Key Features
- Synthetic blend formulation — better long-term protection than conventional gear oils, at a lower cost than full synthetic
- SAE 80W90 viscosity — correct weight for most outboard and sterndrive lower units
- Extreme pressure (EP) and anti-wear additives — protects gears and bearings under high load
- Rust and corrosion protection — guards internal components in the wet, salt-exposed lower unit environment
- Excellent thermal stability — maintains viscosity across a wide operating temperature range
- Recommended for engines over 100 HP — where gear loading is higher and oil quality matters more
Specifications & Certifications
- Viscosity: SAE 80W90
- API service: GL-5, MT-1
- Meets: SAE J2360, Mack GO-J
- Size: 1 US gallon (3.78 L)
- Part number: 27200
Parts Desk Insights
Best use case: This gallon format is the practical choice for outboard service shops, marina technicians, and multi-boat owners who go through gear lube regularly and want the cost-per-litre advantage of buying in bulk. It’s particularly well-suited for high-horsepower outboards (100 HP+) and performance sterndrives where the EP additive package makes a meaningful difference in gear protection. If you need a quart-sized option with a pump included for a single lower unit change, the Quicksilver High Performance SAE-90 Gear Lube & Pump Kit or the Sierra Hi-Performance Gear Lube & Pump Kit are convenient alternatives. To dispense from this gallon jug cleanly, pair it with a dedicated Gear Lube Pump.
Compatibility note: Always verify your engine manufacturer’s gear lube specification before servicing. Some outboard brands specify proprietary formulations — check your owner’s manual to confirm 80W90 GL-5 is approved for your lower unit.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.