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63corvette · 04-09-2010, 10:12 AM

Pennzoil and Quaker State is the same oil and same company and both have sludge issues.
Its the base stock they use according to a good friend who is a oil sales rep.
I had sludge issues with it years ago and stopped using it.
My brother in law had oil pressure issues with his 05 Chevy PU after using Pennzoil in his 60,000 mile vehicle. Upon pulling the pan it had an inch or more of sludge and restricting the oil pickup. Changed the oil pickup and cleaned the pan. Oil Pressure Problem Solved.
He is now using Valvoline and changing it at 1,000 mile intervals to try and clean up the rest of the oiling system.
My 2 Cents

04-09-2010, 10:12 AM	#5
63corvette Senior Member Join Date: Mar 2007 Location: Canyon, Tx Posts: 552 Likes: 128 Liked 359 Times in 103 Posts	Re: work car oil input wanted Pennzoil and Quaker State is the same oil and same company and both have sludge issues. Its the base stock they use according to a good friend who is a oil sales rep. I had sludge issues with it years ago and stopped using it. My brother in law had oil pressure issues with his 05 Chevy PU after using Pennzoil in his 60,000 mile vehicle. Upon pulling the pan it had an inch or more of sludge and restricting the oil pickup. Changed the oil pickup and cleaned the pan. Oil Pressure Problem Solved. He is now using Valvoline and changing it at 1,000 mile intervals to try and clean up the rest of the oiling system. My 2 Cents