Yes, l've used Brad Penn oil in my bikes before, including an older ZX-10R. It's high-quality oil with a strong reputation, especially for high-performance engines. The partial synthetic formula and high zinc/phosphorus content make it great for protecting valvetrains and bearings under stress. Just make sure you're using the right weight (like 10W-40) for your 2004 ZX-12R. Also, avoid any "energy-conserving" oils that can cause clutch slippage in wet clutch setups. I had zero issues with Brad Penn and would definitely recommend it.
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