77 Lubricants Motorcycle Oil 4T 20W-50

Worth knowing

For air-cooled V-twin engines, 77 Lubricants has a separate oil of the same SAE grade, V-Twin Motorcycle Oil SYN 20W-50. Both list API SN and JASO MA2, so the difference between them lies not in the codes but in the base oil and the viscosity behaviour: V-Twin is fully synthetic, while this oil is mineral. At 100 °C V-Twin is thicker, 19.9 mm²/s against 18, and at 40 °C slightly thinner, 142.5 against 147.5 mm²/s, hence a viscosity index of 161 instead of 136. Both have a pour point of -33 °C.

For cold cranking the data sheet gives a CCS of 5200 mPa·s at -15 °C; the upper limit for 20W at this temperature is 9500 mPa·s, and the limits for all winter grades are collected in the table of SAE viscosity values. As the CCS test method, the data sheet mistakenly names ASTM D2270, which is used to calculate the viscosity index; the data sheet for the 10W-40 of the same line gives ASTM D5293 for CCS.