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I run my BMW Z3 on Super-Unleaded only, but as you are saying PDS it's becoming more difficult nowadays to find stations with an E5 pump. I recently spoke to a forecourt attendant and he said they were not stocking it until the new pumps are installed - quite why it needs new pumps to dispense it, or whether it is accelerated decay of the rubber, etc in the current E5 pumps? Either way, the benefits far outweight the extra cost of the E5 in my opinion. Between 1500 and 2500 rpm the engine was always flat on acceleration....switched to E5 and its where it should be now - smooth as silk all through the rev ranges. Not only the driveability of the car has transformed but the economy is much better too. I don't see going back to E10 has any benefit for older cars. However, running E5 in my motorbikes seems to have very little noticable benefit that I can determine (as yet).

Some forecourts are now restricting the use E5 so E10 is only available when filling up. I have had a number of Classic cars over the years and whenever I put E10 in I always dossed the tank with REDEX Petrol System Cleaner which protects against corrosion from E10 fuel and never had a problem. Not used E10 in the XKR yet but if I do I will put in some REDEX.

Hi all, I am looking for advice to help me put my new (to me) 2012 Jag XKR Convertible to sleep for the long Canadian winter. She is currently tucked away in my heated garage with a full tank of premium gasoline with fuel extender added. I plan to start her up every 3-4 weeks or so to keep the circulation going and ensure her battery remains strong. Can any members can offer advice or other measures I should follow to avoid issues in the Spring? I welcome your thoughts. Dave

Keep it on a battery conditioner, such as a CTEK. Starting it as you suggest will help to keep everything lubricated, but is unlikely to be enough to keep the battery fully charged, and these cars do need a fully charged battery. If you can move it a bit every time you start it you will avoid flat spotting the tyres. A few feet will do, if you can try to ensure that the wheels stop at a different point each time.