Odd that you needed oil badly. Is your car burning/ losing oil as these motors rarely need a top up outside of regular service intervals.? How much did you need to use from that 1L bottle. Oils are a very emotive topic. Easiest is to give it to a reputable garage who use quality branded fully synthetic oils like Mobil1, Shell Helix Ultra, Castrol Edge. With oil weight , you also should look for API SN certified. Now to doing it the OCD way. Buy a Millers oil test kit for circa £50 and do an oil analysis everytime you change to test your oil and engine health. What I will recommend is a Grade 4 PAO or Grade 5 Ester based synthetic. The big brands that I mention above are Grade 3. This then limits you to Motul 300V, Gulf Competition, Fuchs Titan Race and Millers CFS or Millers EE Nanodrive which are the best of the best. Best place to buy these are online from Opie Oils. Am sure this GR oil will be Ester based Grade 5 synthetic, hence the high sticker price. Sent from my SM-G781B using Tapatalk