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The recommended fuel/oil ratio for a 1972 model 65hp mercury is 50:1, roughly six gallons of fuel to one pint of2 cycle oil.
10w30
5W-30
50:1
5W-30
SAE 10W30
According to the 2000 Mercury Mystique Owner Guide ( 5W-30 )
Mercury quicksilver premium TC-W 3 or equivilent
SAE 5w20 any major brand conventional or synthetic oil.
5W-30 , according to the Owner Guide
5 W 30 on a 2.3 Liter.
According to one of Fords websites : For the 1972 Mercury Cougar , 5.8 liter / 351 cubic inch V8 engine : ( Motorcraft FL-1-A engine oil filter )