The MOTUL 5w30 8100 ECO-nergy is our go to oil for all street cars.  Its a 100% synthetic oil that will stand up to higher horse power turbo and supercharged engines but still last with extened oil change intervals of 7500 to 10,000 miles.  This oil uses some of the same technology as the MOTUL 300V line which we run in all our race cars.  We have also found that this oil will sightly increase fuel mileage in most cars.  It offers optimal protection against engine wear at all points of engine life.  Sold in 1 liter bottles.  1 liter equals 1.05 quarts.