Oil pan heaters are also designed for industrial use... wolverine heaters. O weight oil lacks what is called laminar flow resistance... aka stick to parts ability. Yes it flows and all that pretty stuff but the noticeable difference when it comes to engine protection between a 5 weight and a 0 weight is what matters. Like i said before my vehicle starts fine plugged in or not, with a pan heater or not. It will be better on the engine with warm/hot oil and cause less internal wear on parts. Our diesel (4M40) is lucky in the fact that it has the ability to take other types of oil aka 5 weight, 15 weight etc. This is not the case in many newer styles because of injection setups, there designed to take a specific weight of oil based on "stickiness"
If 0 weight works for yah go nuts! Ill stick with 5
And don't quote me on this its been a while since i was in school
