I heard Rotella T is going to be rebranded as Rotella T4. Is this correct? Also, regarding cold starting, I realize that within the Shell Rotella brand, full synthetic 0W-40 is best but I want to ask, would you notice any difference between Rotella T 10W-30 which is conventional oil vs Rotella T5 10W-30 which is semi synthetic oil with cold starting. I understand the presence of synthetics lowers the coefficient of friction and theoretically the engine should turn over easier. opinions? Also, maybe Chris the Shell Rotella guy can give us some wisdom. Thanks.