Spectro Oil 2257 20W50 Harley davidson motor engine oil Heavy Duty 1 litre qt Spectro Heavy Duty Engine Oil is a superior motor lubricant designed specifically for use in American-made Harley ® V-Twin engines. Crafted from superior petroleum stocks combined with the most advanced anti-wear, anti-carbon additive systems available, Spectro Heavy Duty extends component life, reduces wear, eliminates valve sticking. Meets all known OEM warranty requirements. Exceeds A.P.I. SF/SG – CD/CG – 4. 20w50, 1 quart Bottle.