Oil - "W" DOESN'T Stand For WEIGHT! In fact, weight is not actually a thing

Lake Speed Jr. puts it better than I can. Weight is not a thing for oil and It’s surprising how many professional engine builders don’t understand this… But then again, it’s the on track results that count…


I knew about the Winter part from my early days turning wrenches, but did not know that the xxW was measuring torque resistance and not flow rate. Science is so cool like that.