I was in Asda the other day, i ventured past the DIY , motoring section, they're doing Carlube fully synthetic engine oil at the following prices (I may have them the wrong way round but bear enough)
5w30 for Ford, Land rover etc...4 ltr for £2,56

0 or 5w20 (can't remember which way round it was) 4 ltr for £1.34

I brought some anyway, not even for my car but Itd do for someone with an older car perhaps, just ridiculous prices.
I don't know if its an error, they're trying to clear the shelves or what. The /20 is an unusual grade and there was a lot of it, perhaps it was a stocking error.
Who knows but weird.