I had a Viscometer at my workplace. Checked virgin vs used sample. Both allowed to come-up/come-down to room temp before measuring. I wish I had my results still, but I wasn't impressed, especially compared to the Mobil 1 Full Synthetic used oil analysis I saw on this forum. Maybe it's me and my driving style and car, and others get great performance from the LM, I do not know. I even swore by the LM in my Volvo in the past and had nothing but good results.
Based on feedback and other forums, I'm going between Mobil 1 FS Euro 5W40 for of the shelf stuff, Motul 8100 Power 5W40 and HPL Euro/Supercar 5W40 for a boutique oil. I see that the Motul has some good deals right now and is also on FCP Euro for their Lifetime Warranty trick if I wanted to pay more upfront...