Ok Gents, I just bought 8lt of above mentioned oil - private sale = got a great deal. Normally i dont buy into this boutique oil simply because of availability and price. So no matter what I do, some of this oil will need to be Franken-brewed as my MDX and TL, both take 5lt each. and No I will not buying 2 lt at full price... The rest of my oil stash is all PP and PPUP MDX will need an OCI, probably this week end. and then both will have a spring time OCI. Thus consuming all the XL oil. What ratios would you suggest.. or even dont mix at all..?? Keep it simple at 4x XL and 1x PP..?? -twice or stretch it out to 3 OCIs? Thanks J.