Primrose
403 Protect O Lube Plus
403 Protect O Lube Plus
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A modern fuel stabilizer concentrate, Protect-O-Lube Plus is recommended for use in diesel fuel* or gasoline engines to increase performance, reduce downtime, clean and lubricate critical engine parts, neutralize the harmful effects of engine acids, remove carbon, gum, sludge, and varnish from valves, cylinders, pistons, fuel injectors, carburetors and all interior surfaces of an internal combustion engine.
Treat Rate 1Gal : 1000Gal Maintenance Dose (up to 1:100 for Treatment)
1.3oz to 10Gal
APPLICATIONS:
- Marine Engines
- Gasoline Engines
- Industrial Engines
- Diesel Engines
- Compressors
- Furnace Oil Burners
Technical Data Sheet
Open / downloadSafety Data Sheet
Open / downloadKey specifications
- Recommended treat rate
- 1:300
- Maintenance dose
- as low as 1:1000 (1.3 oz per 10 gallons)
- Faster cleanup dose
- 1:100 for engines with excessive carbon and sludge
- Fuels
- all grades of gasoline including ethanol blends, kerosene, and diesel (model year limits apply)
- Diesel restriction
- not for model year 2007 and newer diesel motor vehicles or model year 2011 and newer diesel nonroad equipment engines
- Typical flash point (COC, open flame)
- 102 F
- Typical pour point
- -80 F
- Typical copper strip corrosion
- Pass, Class 1
Summarized from the manufacturer's Technical Data Sheet (see the Technical Data tab above). The full data sheet is the authoritative reference.
Common questions about 403 Protect O Lube Plus
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What does 403 Protect-O-Lube Plus do?
403 Protect-O-Lube Plus is a Primrose fuel stabilizer concentrate that neutralizes engine acids and removes carbon, gum, sludge and varnish from valves, pistons, injectors and carburetors in gasoline engines and in diesel engines older than model year 2007 (on-road) or 2011 (nonroad). It also absorbs moisture, helps prevent icing and stalling, lubricates top rings and frees sluggish valves.
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How much 403 Protect-O-Lube Plus do I add to my fuel?
Primrose recommends 403 Protect-O-Lube Plus at a treat rate of 1:300, or 1 gallon per 300 gallons of fuel. For keep-clean maintenance you can go as low as 1:1000 (about 1.3 oz per 10 gallons), and engines with excessive carbon and sludge can be treated at 1:100 for faster cleanup. It is not for model year 2007 and newer on-road or 2011 and newer nonroad diesel engines.
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Can I use 403 Protect-O-Lube Plus in a 2007 or newer diesel truck or 2011 or newer diesel equipment?
No, 403 Protect-O-Lube Plus is not for model year 2007 and newer diesel motor vehicles or model year 2011 and newer diesel nonroad equipment engines, because Primrose states it does not comply with federal ultra-low sulfur content requirements for them. Outside that restriction, Primrose recommends it for diesel, all grades of gasoline including ethanol blends, and kerosene fuels.
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Does 403 Protect-O-Lube Plus work in ethanol blended gasoline?
Yes, Primrose recommends 403 Protect-O-Lube Plus for all grades of gasoline, including ethanol blended gasoline. It also absorbs moisture and helps prevent icing and stalling.
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What engines and equipment can 403 Protect-O-Lube Plus be used on?
403 Protect-O-Lube Plus is listed for gasoline, marine and industrial engines, compressors, furnace oil burners, and diesel engines other than model year 2007 and newer motor vehicles or 2011 and newer nonroad equipment. Primrose also lists it for use in compressor oil to free carbon encrusted valves, for freeing frozen bolts and nuts, and as a rust preventative on fishing tackle, farm implements and fertilizer storage and application equipment.
