Whether or not you would have the same protection as synthetic is something that has been very heavily debated and I won't get into any deeper.

I chane my oil every 3,750 miles with Mobil 1. In the end, the factory has a recommendation for what type of oil is to be used in their engines. It is your personal preference whether you want to follow these guidelines or modify them for your own use. You can never go wrong by using a quality oil and changing in frequently.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record