Pennzoil 550045210 5 quart 5W-20 Motor Oil (SN/GF-5 Jug) Cleans out up to 40% of engine sludge in the 1st oil change. Continues to clean in the 2nd oil change Helps prevent sludge and other damaging deposits Helps clean up engines by gently lifting sludge deposits off engine surfaces and dissolving them safely into the oil Controls high-temperature oxidation and deposits Enhanced emission system protection compared to GF-4 and earlier service categories