I've been considering running a thicker oil in my jeep to help with burning and to help it run smoother. I am just very hesitant to do so but I have added lucas to it in the past and it did help with the oil burning. I understand lucas is "snake oil" and has almost no additives and is changing my viscosity and weight anyways. It take 5w20 currently. I used to put about a 1/4 a quart of the lucas in. What viscosity and weight do you think that would make it after that?