Shipmate 1064 5055 Hi Viscosity 80W90 Plus Lower Unit Gear Lube Review

The Shipmate 1064 5055 Hi Viscosity 80W90 Plus Lower Unit Gear Lube in Action: First Look

For years, maintaining the health of my outboard motor’s lower unit has been a critical, albeit sometimes messy, part of keeping my small fishing boat on the water. This past spring, as I prepped for the season, I noticed a slight weep from the drain plug on my trusty 75hp Yamaha. It wasn’t a catastrophic leak, but enough to warrant a change of gear lube before it became a bigger problem. I needed a reliable, marine-specific lubricant that could handle the constant immersion and stress of saltwater operation. After some searching, my attention was drawn to the Shipmate 1064 5055 Hi Viscosity 80W90 Plus Lower Unit Gear Lube.

The decision to switch lubes wasn’t taken lightly. I had been using a different brand for years, and while it performed adequately, I was looking for something that might offer enhanced protection, especially given the occasional “hard startup engagement” my engine experienced when cold. The promise of “improved gear protection for shock load conditions” on the Shipmate packaging immediately piqued my interest. I considered a few other options, including a more premium brand known for marine applications, but the price point of this Shipmate offering was undeniably attractive for routine maintenance. My first impression upon receiving the tube was its substantial feel; it felt like a quality product, not just a cheap fill.

Real-World Testing: Putting Shipmate 1064 5055 Hi Viscosity 80W90 Plus Lower Unit Gear Lube to the Test

I decided to conduct my initial testing over a long weekend fishing trip on a local lake, which offered a good mix of trolling, occasional bursts of speed, and plenty of stop-start operation. The primary test involved the actual lubrication process itself.

First Use Experience

My test environment was my cluttered but functional garage workshop and then my 16-foot aluminum bass boat moored on a freshwater lake. The application process for this particular gear lube was straightforward. I used a standard marine lower unit lube pump, which attached easily to the tube’s nozzle. The hi-viscosity nature of the lube meant it flowed well without being overly runny, filling the lower unit of my Yamaha 75hp outboard without issue.

During this initial use, I noted no immediate surprises or quirks. The lube dispensed consistently from the tube, and the pump operated smoothly. The consistency was noticeably thicker than some other lubes I’ve used, which gave me confidence it wouldn’t easily wash out.

Extended Use & Reliability

Over the course of that long weekend and several subsequent fishing trips, the Shipmate 1064 5055 Hi Viscosity 80W90 Plus Lower Unit Gear Lube performed admirably. I put approximately 20 hours of use on the motor, which included a significant amount of time at idle and trolling speeds, interspersed with periods of wide-open throttle. The motor shifted between forward, neutral, and reverse with a satisfyingly positive engagement, which is exactly what I look for.

Durability has been excellent so far. After about 40 hours of total use since the change, I haven’t observed any signs of the lube breaking down, thinning out, or leaking. The seals on the lower unit appear to be holding up perfectly, with no signs of weepage around the drain or fill plugs. Maintenance and care are minimal for a gear lube; the key is regular inspection and timely replacement.

Compared to my previous experiences with other marine gear lubes, this Shipmate product stands out for its apparent robustness. While budget options often feel a bit thin or might require more frequent checks, this lube feels like it’s built for the long haul. It certainly doesn’t feel like a premium alternative, but for its price point, it offers remarkable performance.

Breaking Down the Features of Shipmate 1064 5055 Hi Viscosity 80W90 Plus Lower Unit Gear Lube

The Shipmate 1064 5055 Hi Viscosity 80W90 Plus Lower Unit Gear Lube is designed with marine propulsion in mind, offering specific benefits for the harsh environments these components operate in.

Specifications

This particular lube comes in a 10 oz. tube, which is a convenient size for a single lower unit oil change on most smaller to mid-sized outboards and stern drives. The formulation is Hi-Viscosity 80W90 PLUS, indicating a formulation designed for enhanced film strength and thermal stability under load. It is specifically stated to be suitable for modern mechanical shift outboard lower units and inboard/outboard stern drives, and recommended for units specifying Hypoid, SAE 90, 80W-90, 85W-90, or Type C lubricants.

The hi-viscosity designation is crucial for marine applications. It ensures that the lubricant maintains a robust film between moving parts, even when subjected to high pressures and temperatures inherent in lower unit operation. This is particularly important during shock load conditions, such as abrupt shifts or sudden propeller entanglements, where extreme forces can be momentarily applied to the gears. The 80W90 rating signifies its performance across a range of temperatures, offering the flow characteristics of an 80W oil at lower temperatures and the viscosity of a 90W oil at operating temperatures.

Performance & Functionality

In terms of its core function, this Shipmate gear lube excels at protecting the gears within a marine lower unit. The improved gear protection for shock load conditions is not just marketing speak; it translates into a noticeable smoothness during engagement and a quiet operation of the gears. I experienced no grinding or hesitation during shifts, whether I was moving from forward to reverse quickly or easing into gear.

The primary strength of this lube is its robust protection against wear and its ability to withstand the stresses of marine propulsion. Its performance in both freshwater and saltwater conditions is a major plus, offering versatility for boaters who operate in different environments. A potential area for minor improvement, though not directly a fault of the lube itself, would be if it came in a larger bulk container for those with multiple boats or larger engines that consume more volume. However, for its intended application on a single unit, the 10 oz. tube is quite practical.

Design & Ergonomics

The design of the 10 oz. tube is utilitarian and functional. It’s made of a flexible yet durable plastic that allows for easy squeezing, even when used with a lube pump. The screw-on cap is secure, preventing any premature leakage during storage.

Ergonomically, its design is geared towards efficient transfer into a lower unit via a pump. The nozzle opening is appropriately sized to accommodate standard marine lube pump fittings. There’s no real “learning curve” associated with using this product; it’s a direct pour/pump application. The materials used feel standard for this type of product, offering good resistance to the solvents sometimes present in older sealants or residues.

Durability & Maintenance

Based on my experience and the product’s formulation, this lube is designed for durability within its intended service life. The meets MIL-L-2105D and API MT-1, GL-5, GL-4 ratings suggests a high standard of testing and formulation for demanding gear applications. These specifications indicate its capability to handle extreme pressure (EP) additives necessary for hypoid gears, which are common in lower units.

Maintenance involves simply ensuring the proper level of lube is maintained and it is changed according to the manufacturer’s recommended intervals, typically annually or after a set number of operating hours. The lube itself is engineered to resist thermal breakdown and shear, meaning it should retain its protective properties for its operational lifespan. There are no specific failure points I’ve observed; its performance has been consistently reliable.

Accessories and Customization Options

The Shipmate 1064 5055 Hi Viscosity 80W90 Plus Lower Unit Gear Lube is primarily sold as a consumable. The main accessory that is essential for its application is a marine lower unit gear lube pump, which is not included with the tube. This pump typically attaches to the end of the lube tube and allows for easy, mess-free transfer of the lubricant into the lower unit’s fill and vent holes.

There are no inherent customization options for the lube itself, as it’s a specific formulation. However, the compatibility with various marine gear units that call for 80W90 or equivalent specifications is a key aspect of its utility. The 10 oz. tube size is a practical choice, fitting most common application pumps without issue.

Pros and Cons of Shipmate 1064 5055 Hi Viscosity 80W90 Plus Lower Unit Gear Lube

Here’s a breakdown of the advantages and disadvantages of this marine gear lube:

Who Should Buy Shipmate 1064 5055 Hi Viscosity 80W90 Plus Lower Unit Gear Lube?

This gear lube is ideal for the average recreational boater who performs their own routine maintenance on outboard motors or stern drives. It’s perfect for owners of smaller to mid-sized vessels who are looking for a reliable, cost-effective solution for lubricating their lower unit gears. Boat owners who operate in freshwater or saltwater conditions will find this lubricant performs admirably across both environments.

Those who should probably skip this product might include commercial operators or individuals with high-performance, high-stress marine engines that require specialized, manufacturer-recommended lubricants with very specific viscosity indexes or additive packages beyond standard 80W90. It’s also less ideal for those who prefer to buy in bulk for extreme volume needs. A good quality marine lower unit gear lube pump is a must-have accessory, so budget for that if you don’t already have one.

Conclusion on Shipmate 1064 5055 Hi Viscosity 80W90 Plus Lower Unit Gear Lube

The Shipmate 1064 5055 Hi Viscosity 80W90 Plus Lower Unit Gear Lube presents a compelling option for routine maintenance on a wide array of marine propulsion units. Its value proposition is exceptionally strong, offering robust protection and reliable performance at a price point that is hard to beat. The formulation addresses key concerns like shock load protection and compatibility with common specifications, making it a trustworthy choice for most recreational boaters.

I would readily recommend this lubricant to anyone seeking an economical yet effective solution for their outboard or stern drive lower unit. It performs its intended job exceptionally well, providing peace of mind that the vital gears are adequately protected. For its price and performance, the Shipmate 1064 5055 Hi Viscosity 80W90 Plus Lower Unit Gear Lube is a solid investment in the longevity of your marine engine.