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i have a 86 with a 305 and OEM is 5w30 but if higher milage i would recommend heavyer I'll run 20w50 or straight 40 in summer with no problems but that's me also use 40 in winter once in a while hard to crank but after a couple of cranks it fires and have had no problems ut once again that's me

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12y ago
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16y ago

you can use 10w30 unless the milage is very high then use 10 w 50

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