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Costco oil eater works great but is VERY harsh!! If you do use it, make sure not to use it on a hot or warm engine, and neutralize it immediately after.
I used it to clean up an oily/dirty old engine (non Porsche). It cleaned it right up. Even though i rinsed it off with water, two weeks later all of the alloy bits were corroded with a whitish powder and looked like they had been sitting outside for 50 years. It did make it easy for me to see where the oil was leaking from though, which was my main objective.
Oh, as you probably could tell, it doesn't feel very good on the skin either! Wear good protection if you choose to use this stuff.
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