4-Stroke Oil

Full synthetic engine oil is made out of synthetic base stock and a selection of additives that improve the oil's performance. Full synthetic oil provides a higher level of protection than traditional or synthetic blends, meeting the basic lubricant...

Our NMMA FC-W Catalyst Compatible Engine Oils fulfills the specific needs of current 4-stroke recreational engines, whether they have or don't have emission catalyst systems. It passes all approval for all 4-Stroke A applications, including outboard,...

Engine performance can be affected during constant exposure to adverse circumstances such as combustion byproducts, fuel pollution, water contamination, metal particles, acids, pro-oxidants, and excessive heat. That's why oil changes are so beneficial...

This ENGINE OIL, 55 Gallon (118-9440-7) from SeaStar Solutions is reliable, durable, and high-quality. This boat product does not harm the boat engine but only assists in the smooth and safe operations of the boat. This Engine Oil from SeaStar Solutions...

The life of the catalyst by modern ZDDP additive technology prevents phosphorus depletion. To fulfills or exceed the standards of the API SM category and fully and exceed the specifications for FC-W catalyst and FC-W. This ultra-high performance oil uses...

The SYNTHETIC BLEND Mercury'R Stern Drive 5 Quart (18-9440-4) is Blended 4-cycle oil with superior synthetic and mineral-based stock. Superior additives intended to withstand the stresses that sterndrive and inboard engines face. Protection against...

This semi-synthetic ultra-high performance oil contains 12 containers of 1-quart size Premium base stocks with industry-leading additives. Phosphorus depletion is prevented by advanced ZDDP additive technology, which extends catalyst life. Meets or...

Sierra's 10W-30 FC-W Full Synthetic Oil is made up of a unique blend of synthetic base oil and a well-balanced additive system that satisfies FC-W specifications. Synthetic oils are for both outboard and sterndrive applications. Engines that use...

15W40 MULTI-VEHICLE (Quart) (18-9554-2) Sea Star Solutions helps to improve engine sealing, particularly the sealing of pistons and cylinders. Between the various parts, a protective layer is placed, filling any gaps that may occur. It keeps the engine...

A healthy engine provides a smooth and stress-free ride. Lubrication is critical to an engine's longevity. Without oil, an engine would quickly overheat and seize. The Catalyst Oil 25W40 Mineral 5 Quart - Sierra Marine Engine Parts (18-9400CAT-4) is one...

Engines are considered the heart of your vessel and deserve to have the best oil solutions. Bad oil choices can cause more damage and cost for your boat. Worry no more! Seastar Solutions got you covered. Seastar Solutions is one of the leading brands for...

The purpose of engine oil is to cool the engine, reduce corrosion, and remove carbon deposits or tiny metal particles as it circulates. Regular checking of the engine oil is a bare minimum, but to find a good engine oil is exceptionally important...