2010 F250 6.8L V-10. Does anyone know how much oil (IF ANY) I have to add after evacuating an A/C system I am not replacing any major components just the Schrader valves. The underhood sticker states the oil charge at 9 ounces and R134 1.69 lbs. Do I have to put all 9 oz in? If I am not replacing anything? Will the vacuum pump suck all the old oil out? I notice the most common size is 3 oz cans. Thanks

 

If no components were removed and no oil was extracted when the system was evacuated and there was no evidence of a significant amount of oil having been released, then don't add any back in.

 

Ok that’s kind of what I was thinking after doing more research, thanks for the reply.