1985 OMC 65, 100 and 155 HP Models Commercial Service Repair manual, PN 507450-D, Page 57Get this manual
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Off-Season Storage 1 Use OMC 2+4 Fuel Conditioner in your fuel mixture to stabilize the gasolineIt eliminates need for draining fuel for up to one year of storageAdd one ounce of OMC 2+4 for every gal