So the previous owner completely stripped my 5 speed manual transmission fill bolt. Anyone know how much 75w-90 goes into it so I don't overfill it?

 

A pair of big vise grips and a hammer should pop it loose, its not pretty but usually works for me. Or if room i jus find an el cheapo closed end wrench that fits best and put a few good tack welds welding the wrench to the bolt (yur not gonna use the bolt again anyways). But if you do that make sure u have a replacement bolt first obviously Crude ideas but they work for me.