I’ve been watching a YouTube channel for a couple of years or so now. In particular, Tom Lech (a member on here) or which, I have to say, I’m a MASSIVE FAN. I’ve picked up lots of information and tips etc. I have some questions for anyone to answer, but in particular, Tom if you would please, perhaps we could dispel some myths and ALL learn something. I’ve not commented on YouTube because I don’t have an account. I do not want this to become a keyboard assault on anyone but healthy accurate debate must be welcomed. I’m sure the moderators will, errrrmmmmmm, moderate the less helpful vociferous and downright rude. so, here goes with the first of many questions…………. This list of 4 is not exhaustive……. Always going to be the older refrigerants still unconverted and oddballs. In the main then, he way I see relatively modern automotive air conditioning is…….. 1. R134a fossil fuel 2. R134a Ev & Hybrid derivatives. 3. R1234yf fossil fuel 4. R1234yf Ev & Hybrid derivatives PAG oils, non EV&Hybrid PAG oils EV&Hybrid POE oils, non EV&Hybrid POE oils EV&Hybrid (PAG = Polyalkylene Glycol & POE = Polyolester) We simply do not know for certain what lubricant (or blend) is in the vehicle, by the manufacturers or anyone having worked on this vehicle prior to us. All I can do is ensure any oil I put into this vehicle is accurate and SAFE. (For EV&Hybrids) All we can do is try our very best . A bit long winded but bear with me please……….. Q. How many line sets do you use so as to NEVER cross contaminate NON-EV&HYBRID oils into an EV&HYBRID system. Q2. Do you flush the hoses after every vehicle. As I understand it, even droplets of oil from contaminated hoses in an electric compressor can compromise its insulation properties should a fault develop. Q3. Do you use specific recovery machines for each refrigerant/oil spec to ensure no cross contamination, not so much the refrigerant but the oil, even microscopic droplets via the vapour side. No one specific video to pick on, sorry. Also struggling to find and specific definitive answers ps: I have spoken at length with Richard Doran (managing director of Primalec (Snow Leopard Lubricants)) who confirms that “universal oil” is fiction. Use the right oil for the specific replacement and do NOT cross contaminate EV&Hybrids with Non-EV&Hybrids Anyone got thoughts on this at all?