Personally, if you're only waiting a few minutes, especially just for the coolant to warm, you're doing it wrong. My M Coupe takes longer than the 135i to warm, and it makes sense that the 128i, without turbos, would also take longer than a 135i to warm. Waiting for the engine oil, and transmission oil to get to operating temperature will ensure the longevity of your engine, hammering it before this occurs certainly increases the odds of early problems. If it's a lease, carry on...
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