Castrol 03110 GTX High Mileage 10W-30 Synthetic Blend Motor Oil, 5 Quart For cars with over 75,000 miles Helps prevent catalytic converter and emission system failure Superior dispersancy that fights sludge build-up Exceptional oil burn-off protection exceeding industry standards** ** Based on API and ACEA volatility specifications Seal conditioners to help reduce leaks Advanced additives to minimize engine wear Improved fuel economy API SN; ILSAC GF-5 Castrol recommends the use of Bosch oil filters