Marine

Maintenance products to maximize service life and reduce downtime for all your boat and marine applications.

24 products

Which product fits the job?

Product What it solves Best for Key spec
5007 Premium Diesel Fuel Additive Injector deposits (IDID), hard cold starts, low ULSD lubricity and sludge filter plugging ULSD and biodiesel to B20 in common rail and traditional diesels, on-road and nonroad 1:1000 maintenance (1.3 oz/10 gal), 1:250 first two tanks
5757 Premium Winter Klenz ID Fuel Additive w/ Ice Check Diesel gelling and fuel icing in winter, hard cold starts and injector deposits (IDID) Winter ULSD and biodiesel to B20 in common rail and traditional diesel engines Treat rate 1:1000 (range 1:2000 to 1:500)
405C Power-Master Plus Premium Diesel Fuel Additive Low cetane diesel, black smoke, and fuel that won't stay clean and stable All diesel engines, on-road and nonroad, plus fuel oil for furnaces Treat rate: 1 gal per 3,000 gal diesel (1:3000)
3000 Phaser Premium Gasoline Fuel Additive - Prevent and reverse phase separation Water and phase separation in ethanol gas, plus carbon, gum, sludge and varnish deposits Gasoline, marine, diesel and industrial engines, especially those running ethanol gas Maintenance rate: 1:500 (1 part per 500 parts gasoline)
403 Protect O Lube Plus Carbon, gum and varnish buildup, engine acids, sticking valves and moisture in fuel Gasoline, marine, industrial and pre-2007 on-road or pre-2011 nonroad diesel engines Treat rate: 1:300 (1:1000 maintenance, 1:100 cleanup)
406 Injector Perfector Fouled injectors and intake valves, combustion deposits, gas engine knock, ping and run-on Gasoline engines (any ethanol blend), diesel fuel systems and burner nozzles Treat rate per 20 gal: 12 oz clean-up, 3 oz keep-clean
480M Armor Plate w/ Moly D Ultragard Weak oil film, blow-by, engine wear and high amp draw on electrically driven equipment Motor, gear, hydraulic and compressor oils; heavy duty trucks, farm tractors, excavators Mix ratio: 1:10 in engine oil (1 part 480M to 10 parts oil)
327-2 Armor Plate Grease with Moly-D / NLGI #2 Wear, water washout and grease melting on heavy duty bearings, pins and joints All purpose greasing of joints, king pins and bearings on farm and industrial equipment NLGI No. 2, non-melt, Timken OK load 65 lb
327-1 Armor Plate Grease with Moly-D / NLGI #1 Grease too stiff to pump in freezing weather or through automatic lube systems Automatic lube systems and cold weather greasing of heavy duty bearings and joints NLGI No. 1, non-melt, Timken OK load 65 lb
327-C Armor Plate Grease with Moly-D / NLGI #3 Grease that melts in high heat, washes out or will not stay put on heavy duty equipment Construction and mining equipment, steel mills and brick plants, above freezing NLGI No. 3, non-melt, Timken OK load 80 lb
357-2 Armor Plate Grease with Moly-D / NLGI #2 Grease that melts in high heat, washes out, or will not pump in sub-freezing weather Ball joints, king pins, fifth wheels, wheel and roller bearings, cranes, drag lines NLGI No. 2, non-melt (no dropping point, ASTM D2265)
558 Enviro Blend - Rudder Stalk Grease NLGI #2 Grease washing off wet valves and bearings, or leaving an oil sheen on the water Rudder stalks, valves and bearings in contact with water NLGI No. 2, non-melt dropping point, under 1% water washout
555 Armor Plate w/ Moly-D Open Gear Lubricant Grease that washes out, slings off or pounds out of exposed gears, cables and guide rails Slow-moving or stationary open gears, racks, cables and fifth wheels, even underwater NLGI No. 2, non-melt, under 1% water washout
311 Blue Max Grease / NLGI # 1 Need a softer EP grease than No. 2 for cold weather pumping and centralized lube systems Centralized lubrication systems, extreme cold service, heavy duty equipment NLGI No. 1 lithium complex EP grease, from minus 25 F
311 Blue Max Grease / NLGI # 2 Bearing wear at high rpm or heavy load, and grease washing out in wet conditions Heavy equipment, high temperature wheel bearings, high speed and electric motor bearings NLGI No. 2 lithium complex EP, approx. minus 25 to 280 F
410 Hi-Flame Fuel Polishing and Tank Cleaning Stabilizer Sludge and water emulsions that clog strainers, nozzles and lines; fuel layering in tanks Diesel, heating oil, No. 4 to No. 6 Bunker and waste oil in tanks, boilers and furnaces Treat rate: 1 gal per 8,000 gal No. 2 fuel (1:8,000)
777 Syn-O-Gen Synthetic Grease w/ Moly-D / NLGI #0 Grease that melts and runs in high heat, stops pumping in the cold, or washes out High speed and freezer bearings, brick and tile kilns, lithographic ovens, arctic service NLGI #0 full synthetic, non-melt, -40 F to 550 F range
777 Syn-O-Gen Synthetic Grease w/ Moly-D / NLGI #2 Grease that melts and runs in high heat, stops pumping in the cold, or washes out High speed and freezer bearings, brick and tile kilns, lithographic ovens, arctic service NLGI #2 full synthetic, non-melt, -40 F to 550 F range
311 Blue Max Grease / NLGI # 0 Need a softer EP grease than No. 2 for cold weather pumping and centralized lube systems Centralized lubrication systems, extreme cold service, heavy duty equipment NLGI No. 0 lithium complex EP grease, from minus 25 F
3895 Concentrated Fuel Tank Cleaner Sludge, water and corrosion in steel fuel storage tanks and piping Steel diesel, biodiesel, gasoline and ethanol storage tanks; marine fuel systems Shock 1 gal/1,000 gal; quarterly 1 gal/2,000 to 4,000 gal
MP8 Microbicide for bulk fuel & long term storage - Hazardous Freight Bacteria, fungi and the slime sometimes called algae growing in stored fuel Commercial bulk fuel tanks, diesel generators, boats, farm and construction equipment Treat rate: 1.25 to 2.5 fl oz per 100 gallons of fuel
Tuff Jug Utility Jugs 1.25, 2.5 & 5 Gallon Overfilling and spills when pouring (Auto Stop Spout) and hard-to-check jug liquid levels Water, oils, coolants and compatible cleaning solutions for garage and workshop tasks 1.25, 2.5 and 5 gallon multilayer HDPE utility jugs

Specs are summarized from each product's manufacturer Technical Data Sheet, linked on its product page.

Marine questions and answers

  • What should I add to ethanol gas in my boat engine to prevent phase separation?

    Primrose Phaser 3000 prevents and reverses phase separation in ethanol-blended gasoline when used at the proper treat rate, and its data sheet lists marine engines. The maintenance dose is 1:500 (1 part Phaser 3000 to 500 parts gasoline), also the recommended dose for seasonal storage. Reversing fuel that has already separated may take 1:30 to 1:100, but doses stronger than 1:500 may only be used in off-road gasoline.

  • Should I use Phaser 3000 or 403 Protect-O-Lube Plus in my marine engine?

    Primrose lists marine engines for both Phaser 3000 and 403 Protect-O-Lube Plus; pick Phaser 3000 to prevent or reverse phase separation in ethanol-blended gasoline. Both remove carbon, gum, sludge and varnish; 403 neutralizes engine acids and Phaser 3000 helps prevent their corrosive effects. For diesel engines, Phaser 3000 complies with federal low sulfur content requirements, while 403 is not for model year 2007 and newer diesel motor vehicles or 2011 and newer diesel nonroad equipment engines.

  • What grease should I use on a rudder stalk or other parts that stay in contact with water?

    Primrose 558 Enviro Blend is an NLGI No. 2 rudder stalk grease for valves and bearings in contact with water; it goes on wet or even submerged surfaces, showed under 1% water washout (ASTM D1264) and passed the salt water spray test. For exposed gears, racks and cables, Primrose says 555 Armor Plate with Moly-D (also NLGI No. 2) is waterproof even against salt water and especially useful underwater.

  • What kills bacteria and algae in a boat's diesel fuel tank?

    Primrose MP8 kills bacteria and fungi, and any algae present, in diesel and other fuels used in boats and ships. It is an EPA-registered pesticide for commercial and industrial use only, dosed at 1.25 to 2.5 fl oz per 100 gallons, and may exceed the federal 15 ppm sulfur standard for 2007 and newer diesel vehicles and 2011 and newer nonroad engines. Always follow the product label directions.

  • What Primrose additive should I use for sludge and water in a marine fuel system?

    Primrose 410 Hi-Flame and 3895 Concentrated Fuel Tank Cleaner are both listed for marine fuel systems, and each disperses the sludge and water emulsions that typically clog strainers, nozzles and lines. 3895 is designed for steel storage tanks, where most need a one-time shock dose of 1 gallon per 1,000 gallons; 410 uses 1 gallon per 1,000 to 2,000 gallons of No. 2 diesel for fuel polishing and tank cleaning.