I have belonged to other site that had this feature. Basicly we all decide on a brand and weight of oil to try. We then get 100-200 people to purchas some minium amount like 1-4 gallons per person. THen we all pre pay by a deadline date with paypal to BOBITOG or simalar. Then we wait for product to arive. Quite often we were able to products anywhere from 30%-70% cheaper then retail doing this! This way we could use the groups size to leverage better prices from smaller oil distributors. This way we could try Motul, Redline, Delvac 1 and do it rather cheaply!! Just an idea.