Best Marine Grease of 2026

Calcium sulfonate, NLGI 2, rated for high load and high temperature — the label on Quicksilver's tube reads like a page from an outboard service manual, which is more or less what it is. This is Mercury's own grease, and the list of places it is meant to go covers gimbal bearings, U-joints, steering and shift cables, suspension, and wheel bearings.

The calcium sulfonate thickener is the interesting part. It is a grease built to hold film strength under load and to resist thinning when a bearing gets hot, and the gimbal bearing is the component that makes the case for it: it sits behind the bellows where water collects if anything goes wrong, and it is a miserable job to redo. The same tube covers the trailer hubs and the coupler.

Where the tube format helps is the small stuff — shift and throttle cable ends, a tilt tube, a hinge. We found the squeeze tube quicker than a gun for those: one hand on the tube, one on the fitting, and the grease lands where you aimed it instead of running down the cable.

The deciding detail is the thickener family. Calcium sulfonate is not the same base as the lithium-complex grease in most trailer hubs, so if you do not know what is already in there, plan on a clean repack rather than a top-up. For a Mercury or MerCruiser owner working from the manual, that is a non-issue, and it is why we name this one first for outboard and sterndrive service.

The line worth reading on Star brite's cartridge is the ASTM D4950 GC-LB classification. It is an established service classification for wheel bearing and chassis grease, and this is the only pick here that prints one — a small piece of evidence that the grease was evaluated against a standard rather than a marketing brief. The 14-ounce cartridge fits a standard grease gun, and the formulation is aimed squarely at trailer wheel bearings that get dunked in salt water.

It is the least expensive cartridge in this group, and it does the job the category exists for: packing a trailer's hubs before the season and holding rust off the races. Be ready for a tacky grease. That is exactly what you want clinging inside a hub and exactly what you do not want on your hands, and it will string off a fitting when you pull the gun away. For a trailer dipped a dozen times a summer and repacked each spring, that is a fair trade.

A tub answers one specific job better than anything else: packing a wheel bearing by hand, palm full of grease, working it into the cage until it comes out the other side. Sta-Lube's 14-ounce tub sits open on the bench for scooping, and the blue aluminum-complex grease inside is tacky enough to stay in the rollers while you seat the seal. If you only ever feed a grease gun, skip it.

Aluminum complex with a polymer additive is the formulation, and the pairing targets water washout — this is a grease built to cling rather than rinse away when a hub goes under at the ramp. The published upper limit of 469 degrees Fahrenheit is generous for trailer work, and a tub this size lasts several seasons of spring repacks.

This is the tub we reach for when a bearing is going back together, because scooping beats trying to inject grease into a cage with a gun. It is a legitimate trailer grease rather than a bike-shop generalist, and the washout resistance and the 469-degree ceiling are why. Buy it if your maintenance involves a bearing packer or your own hands; buy a cartridge if it does not.

Use where grease A is specified in the service manual is the entire pitch, and for a Yamaha owner it is a good one. Buying the factory grease takes a decision off the table: if the manual calls for grease A, this is grease A, and there is no compatibility question to work through, no cross-reference chart, and no guessing about whether a generic marine grease meets the spec.

What we did not expect was how well it suits reels. A 10-ounce tube is a sensible size for a reel service, the grease is tacky enough to stay on a gear train without gumming the drag, and it works on baitcasters, fly reels, and saltwater spinners. If you service your own reels, that alone justifies keeping a tube in the box.

So it is a specialist's tube rather than a trailer-repack purchase. For the jobs the grease was actually specified for — outboard fittings, cables, and reels — it is the right thing to have on the shelf, and it is the answer for anyone who would rather follow the manual than second-guess it.

Won't swell seals, packing, or O-rings sounds like a marketing line until you have had the other kind of grease soften a rubber part you then had to replace. Triple-Guard is BRP's factory grease for Johnson and Evinrude outboards, and that seal compatibility is the reason it is in this guide instead of a generic tube of lithium.

The rest of the sheet is what a marine grease should be: waterproof enough not to wash off, unaffected by salt water, vibration, or cold, and compatible with other greases so a partial changeover is not a drama. It is an 8-ounce tube, sized for lower-unit and jet-pump work rather than a four-wheel repack, and it is thick enough that it beds into a spline and stays there.

We like having it on the bench for anything with a rubber seal in the stack — a water pump housing, a jet pump, a lower unit going back together — where the seal claim is worth more than a marginal difference in dropping point. It is also the pick when an Evinrude or Johnson manual names the factory grease, since that is precisely what this is.

It is shelved with bicycle tools, which says where Bel-Ray expects to sell most of it, but a 16-ounce can of waterproof grease is a marine product in everything but name. This is a thick, sticky grease that resists water rather than rinsing out of a bearing — the property that matters in a trailer hub, an outboard pivot, or a dirt bike's linkage, and the reason one can ends up doing all three around here.

It is the crossover pick for a garage that already maintains bikes and a boat, because a can this size covers both and the formula is simple enough to trust for general bearing work. There is no wheel bearing classification or temperature rating printed on it, so you are buying on the formula rather than a spec table. If you are already a Bel-Ray user for motorcycles or bicycles, this is the same can doing double duty; if you want numbers to compare, one of the others will suit you better.

Thirty cartridges is a commercial quantity, and that is the honest way to read this listing: a case of grease for someone with several trailers, a yard of equipment, or a service bay. Each cartridge is sized for a normal grease gun, so the format is familiar — the difference is buying a season or three at once.

The numbers on the label are the most specific in this group. A Timken OK load of 65 pounds describes how much pressure the film takes before it gives up, and a dropping point of 570 degrees Fahrenheit is high for a grease aimed at trailer axles. Translated, this is a grease for high-load, hot-running bearings — trailer hubs, steering cables under load — with adhesive properties that keep it from being flung off.

Lucas also lists rust and corrosion protection in both fresh and salt water, which is the claim a marine grease lives or dies by, and the adhesive character shows in the consistency: it is a sticky grease that hangs onto a surface rather than slumping off it. That is the behavior you want on a trailer that goes under twice a weekend all summer.

Where it makes sense is scale. A marina, a dealer, or somebody with four trailers and a tractor will work through a case and get the best per-cartridge economics here. One boat on one trailer is several years of grease in a single purchase, and a bottle or a couple of tubes will do the same job with less shelf space.