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Did not know that Pennzoil was a Shell product! I have used Shell for my last two vehicles, have always believed keeping the oil clean and using top tier gas will make for a happy engine. In the mid 80s I was using Quaker State until a mechanic friend told me that it caused build up in the...

So to sum it up... Good quality oil and oil filter every 5,000 miles with good quality gas should do just right. That a true statement? I have used Shell gas and Shell Rotella oil for years, any reason to change? I appreciate all the responses, thanks everyone.

Just bought a used F150 and coming up on an oil change, thought I would ask for recommendations for oil brand and type. 1. 2013 F150 XLT Supercrew 3.5L Ecoboost 2. Owners manual - 6 qts Motorcraft SAE 5W-30 XO-5W30-QFS 3. Shreveport, LA (it gets hot and humid) 4. I like to let the horses run on...