+1 on the Mobil1 15W50. I have used it in the turbo motor forever and to that I add a bottle of Liqui Moly. It quiets the engine considerably. Everyonce in a whole you can get it for $22 bucks at Walmart and Mobil1 has a coupon for half off of that!This is out of date. If people are still recommending this then they don't understand synthetic oil, the definition and formulation of which have changed greatly since the 70s. Honestly the word "synthetic" doesn't really mean much in the context of oil anymore (see the Mobil v. Castrol lawsuit in the 90s and outcomes thereof.)
Mobil1 15W50 is one of the limited number of modern oil that still contains higher levels of ZDDP anti-wear/scuffing additives. All the other Mobil1 street formulations have gone to lower levels, as have most other SN grade oils.