Originally Posted By: DarthDuty
Vehicle in Sig Driven hard sometimes, using Fram Tough Guard 7317.
Choices are all dino 5w30, valvoline, quaker or pennzoil.
Replacing valve cover, no sludge visible.
We recommend our Pennzoil Platinum High Mileage 5W-30 motor oil for your application DarthDuty. Pennzoil Platinum High Mileage is specifically formulated to help prevent sludge and other damaging deposits. In addition, it will actually help cleanup older engines by gently lifting sludge deposits off of engine surfaces (and dissolving them safely into the oil, so that these deposits can be taken out of the engine at your next oil change). - The Pennzoil Team