Think that's a good bet ^ 5w40 you use mate or the 10w50? "5W40 - Competition Fully Synthetic Triple Ester Nano Technology formulation. Suitable for fast road/street modified engines, race, rally, sprints and hill climbs. Ideal for engines with hydraulic tappets e.g. Ford Zetec. 10W50 - For race and rally engines, and especially suited to modified, high performance vehicles with or without turbochargers, for fast road/street modified engines and track day use. A performance alternative where the manufacturer specifies a 10w40." Looks like decent stuff with proven results! £52.03 on Demon Tweeks atm too Bret.