I think he means t6 5w-40. Most people don't understand oil viscosity measurements. Its a little complicated. Most engine wear occurs on start up because the oil is too thick to flow fast enough to cover all the parts needed to reduce wear. a 15w-40 and 5w-40 are the same viscosity at 212'f, the only difference is that the 5w does not thicken as much as the 15w will when it cools. this means your oil will flow quicker on a cold start with the 5w reducing engine wear. You could also use a 0W but the T6 is good, and cheap for a full synthetic that is good with wet clutchs.