Honda set the standard for motorcycle oil when it introduced GN4 way back in 1975. We selected the highest-quality base stocks and created an additive package specifi cally designed for the unique requirements of motorcycle and ATV engines. As a matter of fact… we still do! Constant testing and development have evolved to give today’s GN4 even better shear resistance, viscosity stability and cleanliness to meet the requirements and stresses of a new era of engine technology. This is the only oil Honda R&D recommended for our complete TRX range, especially the “FA” series.