I do not run a splash guard on any of my vehicles. I did replace the alternator on the E320 at around 95k miles. I always look at the garage area underneath the E320 and the driveway area underneath the 300D to make sure there are no leaks. I want to know if any of mine are leaking as soon as I move them. I don't look under the Honda very much but you really don't have to
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