SEMI-SYN is a complex blend of synthetic esters and highly refined petroleum base stocks offering protection beyond conventional oils. Technologically advanced additives containing special anti-wear/extreme pressure additives protect critical engine components from extreme loads and peak temperatures generated by high-performance engines. Advanced, shear-stable polymers resist mechanical break-down and viscosity loss of the oil. SEMI-SYN delivers increased horsepower, optimum engine cleanliness, reduces wear on bearings, cams, lifters, crankshafts and extends engine life. High Zinc/Phosphorous formula engineered for use in flat tappet and roller element engines.

SKU: 39-34901B Categories: ,



  • High Zinc Formula
  • Increased Horsepower & Torque
  • Ultimate Protection of Critical Engine Components
  • Shear-Stable Polymer System Maintains Constant Viscosity



MAXIMA SEMI-SYN is compatible with petroleum and synthetic engine oils. SEMI-SYN is a fully formulated race oil and does not require the addition of additives or boosters. No special procedures are required when changing to Maxima Racing Oils.NOT RECOMMENDED FOR STREET USE. MAXIMA SEMI-SYN race-grade formula has elevated anti-wear additives designed to protect engines in extreme conditions. Elevated antiwear additives may adversely impact emissions. systems on passenger cars.

Technical Data

SAE Grade J300 10W-40 20W-50
Appearance Amber Amber
Viscosity cSt @ 40°C D2270 111.2 165.6
Viscosity cSt @ 100°C D2270 15.17 19.66
Viscosity Index D2270 143 137
Density D4052_15.0 ND ND
Flash Point °C D92 436 436
Pour Point °C D92 -25 -25


Safety Data Sheets

Our Safety Data Sheets (SDS) provide up-to-date and accurate information on the material handling of this product.

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