Not really, sure the oils warmer but it's just been pumped around the engine, so there will still be oil draining from everywhere. If you drain it cold then all the oil that is ever going to drain is already sitting in the sump ready to drop. You gain nothing by doing it straight after a drive and probably end up draining less oil, not to mention the added worry of burning yourself.
Take it back and get a refund, if they crack the shits tell them they recommended you the wrong oil and demand your money back or an exchange. Something around 5w/40 is good as said.
Number 1 rule of owning a modified car is never listen to the opinion of anyone at an auto parts store, especially when it comes to oil and spark plugs!