Review on 🔧 Mastercool 82375 R134A Oil Injector: Essential Silver Accessory for Seamless AC Maintenance by Johnathan Stoner

I used this to add oil to my Ranger's AC system. I wasn't sure I was doing it correctly per their instructions and I had to pull the vacuum a few times to get all 2 ounces of oil into the system but everything else worked fine. A very durable item. BE SURE TO CLEAN BEFORE USE! I can't stress this enough. I rubbed some horsefly through and poured the contents onto a towel. I saw a lot of aluminum metal shavings and foundry oil (black mass). I'm glad I read a review that says you have to delete it first otherwise I would just use it and get this crap in my system. I am also putting this in my review to hopefully help someone. I had no problems putting the cap on or taking it off. Threads were clean and all fittings/O-rings were intact.