Sizes:

Small is a 1 Litre RRP$18.95

Large is a 4 Litre RRP$54.95

Each sold seperately

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Bel-Ray Thumper 4-Stroke Racing Motor Oil is specifically engineered to meet the demands of single cylinder multi-valve 4-stroke racing engines. The high temperatures and severe loads of racing require the exceptional film strength, shear- and temperature stability of Bel-Ray Thumper 4-Stroke Racing Motor Oil.

Applications:
For use in either engine or combined engine/gearbox systems Recommended for single cylinder multi-valve 4-stroke racing engines Equally suitable for air-cooled and liquid-cooled engines

Features and Benefits:
High viscosity stability High Viscosity Index and shear stability of the synthetic components provide superior lubrication and film strength Superior lubricity High Viscosity Index oil provides superior lubricity for reduced friction loss resulting in maximum engine power.
Superior anti-wear Exclusive Bel-Ray anti-wear additive chemistries form a very low friction coating on all lubricated parts for best wear protection of valve-train and gears subjected to constant shock loads and boundary lubrication.
Superior shear- and temperature stability Oil flows freely when cold and maintains exceptional film strength at high temperature for improved ring sealing and compression.
Superior deposit control Unique anti-oxidants, dispersants and thermal stabilizers prevent and solubilize existing sludge and deposits for better engine cooling.

General Description:
Bel-Ray Thumper 4-Stroke Racing Motor Oil is a premium multi-grade synthetic blend motor oil engineered for single cylinder multi-valve 4-stroke racing engines requiring maximum wear protection of valve-trains, rings, cylinders and pistons. Bel-Ray Thumper 4-Stroke Racing Motor Oil protects against viscosity breakdown under high temperature, high shear and fuel dilution conditions commonly found in racing.

SAE Grade 20W-50 10W-40