i have a gas and gasless mig a sip 170 with gas or gas less it is spot on for welding cars gas less for a learner is better has you dont have to set the gas,also welding out side gas less is better due to wind,gas removes the oxygen allowing the weld to be hotter and stronger but on a car that is not as important unless it is affecting the strength of the car my mig is a ideal learner welder but not cheap i paid £600 brand new but have seen them on ebay for £400