Approx 3 years ago took '04 Touareg for oil change...

Approx 3 years ago took '04 Touareg for oil change. $90+ for synthetic. Got home checked the oil, still black! They charged me but didn't change the oil. They refunded my $$ & completed oil change. Should have learned lesson, but in Jan needed a battery on a Sunday. Took same car in for a $250 battery install. Car didn't start correctly in cold weather. Took back to these guys said no problem with battery or alternator. 2 1/2 weeks later car died on Strawberry Mansion Bridge in freezing snow squalls. DO NOT TAKE YOUR CAR HERE.