Coupon expires 1/31/2011. $32.95 includes 5 liters and a Mobil 1 filter. No Mobil 1 filter is available for our TDI engine, so get one for another car you have or get one for a neighbor. My local Pep Boys has lowered the ESP oil price to the same price as regular Mobil 1, so the difference between quart and liter didn't bother them and the coupon is honored. Just trying to help out my fellow DIY'ers.