Oh okay thanks, I'll go with 75w-90 synthetic up front then. The manual doesn't give a capacity, anybody know how much? I imagine 2 qts should be enough...
If the undercarriage is surface rusted, is there anything you can spray overtop to stop it from further rusting more? Like spray paint or rhino lining or something similar? Or are you required to sand it all down to bare metal before spraying over top?