51 plate will be fine, the tddi engine likes it
but 06 on had the tdci engine fitted
these dont like cherry at all and it WILL get costly puting it right if you try to run cherry in 1
theres differant grades of red diesel available, but generaly in britain we have a good grade so its ok on most cars
but it IS NOT the same diesel with red die added
it used to be but as of a few years ago most processing plants changed it
as it was costing them more to produce it this way
modern red diesel is made to a lower standard with less additives than modern white
but it is still a high enough standard to be fine in most cars