Hey guys! I have an 05 Audi S4 and I am coming here from Audiworld for my oil info as there is not enough consitent info there regarding this subject. I'm deciding on an oil for the summer. My car calls for a 0W-30 or a 5W-30 or 5W-40 as the dfault grades. Even though the 0W-30 is probably fine I feel it is an energy conserving grade that I would rather use in the winter. I have some GC for that come Nov. My choices are Silkolene Pro S 5W-40, Motul E-tech 0W-40 or Elf Excellium LDX 5W-40. The elf and silkolene only come in 5 liter jugs and like I said I will be putting in GC in the winter as I am dying to try this out what with all the love it gets on here. The motul comes in 1qt. bottles so it is more convenient if I need to have a qt or 2 extra on hand. I'd need to have an open 5 qt. jug in the Fuchs or Elf and I'd rather not keep it open for ~ 1year. The Elf is PAO and the others are Ester based. What do you guys think of this oil. I can't seem to find any UOA's of it and the search function takes a 1/2 hr. and comes up w/ vague info sometimes. I've heard M1 T&SUV gets good reviews here but my dealer would flip if he found I put that in and I bring the oil there for the change anyway. Is the M1 good, BTW?