I have just bought a small tractor unit for my allotment (I am old enough to admit to having an allotment!) to which can be fitted various attachments. Reading through the engine info (15hp Honda) it suggests running through with Aspen fuel at the end of the season. Having never heard of the product, I looked on their website, which seems to suggest that it is equally useful for larger 4 strokes that are "laid-up" for any period. Does anyone have any knowledge/experience of this for classic cars? I generally don't have a problem with my Spitfire4, come the start of the season but I know that my brother has problems with his TR4. Are there any other such products? Stewart Sloan