Answers: According to the FRZ 600 manual it should cart 2.6 quarts of 20w40, of course you entail to know whether the privious oil be synthetic or petroleum base, you don't want to mix the two. although a total translation will eliviate that . But if you run synthectic through an older engine you may bring to a close up with leak internally
Most bikes around that era use 10-40w. Get a Haynes or Clymer manual.
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