This is Pentosin's Pentofrost and it's what I use in my VW TDI. I highly recommend it. You can buy it at Advanced Auto Parts. It's used by VW Dealers. It's recommended for all aluminum engines. I am needing to flush my PBS and I will be using what I still have on the shelf.
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Artic Silver Boxster S - Black Leather - Black Top - Convience Plus Package