Paul, yes I have bowled on practice with heavier oil patterns. In fact, I did this intentionally all Summer. A house near me lays out the PBA patterns for practice 1 night a week, and I took advantage of it. Bowled 6 games per week on them, and learned a lot. It was much different bowling without the pressures of league. I took my time. Studied the ball reaction. And, tried my best to learn to read the lanes. I actually think this helped.
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Storm - Shift 16# Medium Length
Legends - Conqueror 16# Heavy arc
Brunswick - Scorchin Inferno 16#, Med-Heavy oil
Legends - Terminator 16# Heavy length
Legends - BigRBang 16# Medium Arc