I've got 20 litres (5 cans) of Castrol Edge Sport 10w60 for sale. This oil is the replacement for the old Formula RS.
This stuff retails for about £35-£38 per 4 litres. I'll sell them for £25 each or £120 for all 5 cans.
Clearly, given the weight of the item(s), collection would be preferred. I'm based in Warwick, but I'm often in Reading, so could arrange to drop them off or meet halfway.
Matt