[quote="MADRod Todate we have completed 17 timed Topspeed including the 7 fastest ever by a Cosworth & we aint dropped an engine yet. We change the oil before & after every Topspeed run, I wonder why.

Rod[/quote]

Rod, i never lost an engine either and i did plenty of back to back top speed runs and only changed the engine oil after 1000 miles or when i remembered to! i changed the gearbox oil more frequently than the engine oil...