Quote:
Originally Posted by Dave R
You can mix them with no issues. If it still smokes too much at idle, you'll probably want to address the oil injection pump. That said, I can't fathom how it would possibly add too much oil, it operates directly on engine intake pulses (so it can't possibly run too fast) and is a positive displacement pump, if memory serves. I suppose it might have a failed part inside, but I dunno  The only failure I am aware of with them is when they stop pumping and you replace them. AFAIK, there are no rebuild kits for the oil side of the pump.
Here's a cutaway diagram of the VRO pump like you have:
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I was always under the impression that when oil pumps fail, they fail "open", so there is no stoppage of oil flow to the motor. It results in extra oil, and extra smoke.