Hello all, I have a few questions that I hope I can get some answers to. While I'm no stranger to fairly in-depth vehicle work(rebuilding engines, transmission work, engine swaps...), I am struggling quite a bit however to understand how the individual components of an oil add pack, noak, sap, and pretty much everything else fit together. I recently stocked up on a fair bit of oil from AutoZone's clearance, much of it being euro oils. They're all SN rated, and also carry vw approvals (I am planning on putting a VW tdi in a Suzuki samurai or jeep in the very near future), so I figured I could put it to use in something. The oils in question are: Pennzoil platinum euro lx 0w-30 Pennzoil euro av 5w-30 Pennzoil platinum euro 0w-40 Pentosin pento super performance lll 5w-30 If I do put these in a gasser, it will be a Subaru legacy(ej253 engine). The questions are: 1. Do I still need to be concerned about the sulphur level in fuels? 2. What are the main differences between these and why were there so many variations of euro oils(at least in Pennzoils case) 3. Are these suitable for the engine in question, in particular if I'm running this oil (over 5k oci's or longer) for at least 30k miles. I understand that all of these questions have been asked in other threads, but as was mentioned earlier, I am struggling to understand the answers. I am asking not only to see if this will work in this particular application, but to further my own comprehension of motor oil. If someone would be patient enough to explain this to me like I was a 5 year old, I would be extremely grateful! Thank you in advance!