Having scanned though the previous thread I figure that you guys should really know the real life experiences of a close relative and his good friend who both run Xants on oil.
Three have been used extensively, a bog standard 19, a 19 Turbo, and a series 2 2.1 Turbo. The 19 turbo has now been running on exclusively oil for over a year - no diesel at all except when in a dire "Oh sh*t no fuel!!" situation. The 19 was run for about a year and the 2.1 has now been going for about 9 months. All on the same exclusive-except-emergency basis.
None of the cars has been modified in any way shape or form (except the addition of a cleverly shaped funnel in the boot for topping up!!!).
None of the cars has experienced any failure of any fuel related component.
None of the cars has failed to start (and we live in a northerly climate!), they are however just a little sluggish to start on *very* cold winter mornings (say minus 5 and below...)
The tax aspect is interesting, it is a completely unenforcable law in the UK, remember to prosecute they need the evidence, the only evidence they have is the volume of oil in your tank. As it is a tax issue, all they can do is bill you for the tax and prosecute if you don't pay. Running your car on oil IS NOT AND WILL NOT EVER BE ILLEGAL IN THE UK. So where does this leave you? In a very good position as it goes. If you get pulled and have your tank dipped, plod will try to convince you that it is illegal - it just isn't, tell him so (if it comes out with a pinkish tinge you *are* stuffed as agricultural and heating diesel *IS* illegal...). All plod can do is tell H.M. C&E that you have a tank full of oil and it is up to them to recover the duty due ON THAT TANKFUL, there is no other concrete evidence that you have used or will use more oil. When you tell them that their cost to recover that duty is going to be more than the duty itself, you should hear no more. If you do hear more, keep pushing the point that it is costing them more and more money to recover the piffling amount of tax and that it wouldn't look good if it hit The Sun...
...keep going right up until the point where they give you the "Stump up within 7 days or we will take you to court" letter then send them the cheque for the couple of quid that they will be asking for and make the point again that it has just cost them X-hundred pounds of tax payers money to recover £2.74 in tax etc...
...you will hear no more!!! Even if you do get stopped again, all you will have to pay is the duty on the amount of oil you have in your tank at the time assuming that your protestations about tax payers money etc etc...
So what else to you need to know? Not a lot except that you do get *very* funny looks buying an entire trolleyful of Tesco's cheapest!!! And yes, your car does smell... *appetising*!!! I once followed one of these Xants for about 40 miles and I was STARVING by the time we reached our destination...
Happy oil burning guys!
CAS
PS. Anyone got a 2.5 XM in SEI spec they want to sell me? I could use a bit of cheap luxurious motoring!