hey villain havn't seen you post in the ol mk4 section for a while hope the ol motors still allright. a for the derv thing i found BP ultimate to be smoother in it's power delivery TBH(i pressume you meant BP ultimate as the diesel extra is shell i beleive) other diesels i tred weren't bad an i didn't notice a lack of power but BP does defo make it run differant. guess it's up to personal taste