I would think you can, as long as you do a good flush out. That is, drain the syth, fill up with dino, run for a few minutes. Drain and repeat. Its hard for me to believe that what little synth is left could damage your engine.
Speaking of which, what about "semi-synthetic" oils? What's the difference between having a little synth left over and using a semi-synth oil? Maybe there are some stabilizers in play to eliminate any incompatibilities?
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