John, the tapping I am talking about is not the same one I heard when I picked it up. That was much more pronounced and constant, until I got on it pretty hard. As you recall the car had been sitting for awhile. That injector knock has never resurfaced.

This "tap" is a lot less pronounced, yet it is distinctive against the backdrop of all normal diesel sounds.

I was thinking about trying some synthetic , so we'll see.

Thanks

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