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A conversation with engine- lubrication guru Lake Speed Jr. gave us great insight about the importance of treating new engines (especially camshafts, which require higher amounts of zinc) with lubricant that’s designed for tighter clearances and low-temperature break-in. Driven Racing Oil’s BR-30 is a SAE 5W-30 lubricant that provides excellent ring sealing; it can be used for dyno tuning and about 400 miles of street driving. After break-in (for us, it’s once the dyno’s rollers stop turning), HR-4 will pull daily duty. It is Driven’s synthetic 10W-30 formula that contains higher levels of zinc for increased protection against camshaft wear.