Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 176Get this manual

Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 176

EMISSIONS
STRATIFIED VS HOMOGENIZED CHARGE
OFI engines use stratified charge inside the combustion chamber to aid in reducing emissionsAll other models use homogenized chargeThe difference between the two is:

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