Dexos, what is it, I'm aware of it and have read other threads, and I'm not sure is it a sort of detergent and should give less deposits in the engine. Can non Dexos oils be contributing reason to V6 oil sludging that comes up from time to time, notably when timing chain issues arise and the questions about service history etc? To the Op buying two litres is probably not economical way to buy oil, best to get at least 2 x 5 litres and save the left over for top up and next service probably then only need 5 litres, of course you need somewhere to store it, might be a pain if you live in a unit with no garage of your own.