Sorry, that's actually what I meant.
Penrite HPR Diesel 5 in my 300TDI.
To be more specific, just wondering what difference this will make to the engine if any? Is running the HPR Diesel 5 better for my 300TDI than running the HPR Diesel 15? That was my theory and why I bought the HPR Diesel 5 over the HPR Diesel 15, but whether or not my theory is correct is another story I was hoping to validate. :)

