Getting close to oil change on my Caravan so I will be using 5w20 Valvoline Advance Synthetic with Maxlife 5qt jug and 1qt of Valvoline Advance Synthetic 5w30. I have 5w30 PP in now and running good. Do you think it would have any effect on the 20 grade as both have same additives? I know Maxlife advertised more seal conditioner but that's all I see. I got these on sale with the 5w30 goes in lawn equipment so would like to use it instead of sitting on shelf. I have more Maxlife but doing this would allow me to keep Maxlife sealed. I don't even think it would cause oil to be heavier.