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Ralph Wiggum

Curious about Oil Injection

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Can anyone explain the difference between the oil injection system on a Merc and a VRO?

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I'm pretty sure the VRO (Variable Ratio Oiling) picks up the oil and mixes it with the gas pre engine at a rate variable to your current RPM. Basically a smart mixer.

While the others are direct injection.

I could be wrong though.

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I thought that too, but from what I have read, the Mercs are variable, too, depending on RPM.

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OMC injects the oil into the gas stream in the gas pump by itself, driven by vacuum lines

Mercury (and others) are variable as well, but are gear driven typically and do not involve vacuum

marine_man

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