Way back there was a question about which brand of oil to use, and the answer is simple. It does not matter. Any top brand is equally excellent. Top conventional oil is very good. Synthetic oil is better at very cold temperatures as it thickens less in the cold, at very high temperatures because it thins less in the heat, and it oxidizes more slowly for longer oil life. I use syn in all my turbocharged cars (2 so far). Keep in mind that turbocharged diesels in trucks, ships, rail engines, etc., use conventional oil and have great results--the last ship's diesel engine I worked on had four 4' diameter turbochargers with 30 wt conventional oil in their own sumps, an no oil lubricated problems. Do use the quality and viscosity engine oil recommended in the owner's manual. Low viscosity oils such as 5W-20 and 0W-20 create less internal friction inside the engine for a sliver less drag and a bit better gas mileage, as well as being more suitable in frigid temperatures. The current top oil categories are ILSAC GF-6A and API Service Category SP. Those are upgraded every few years, and always buy the most current. They will be fully compatible with the older categories listed in older owner's manuals.