Can i run mobil1 15W50?

[Phantom5oh]

If I were you I wouldn't mix synthetic oil and conventional oil. Its not a good idea because the synthetic oil has a tendancy to break down conventional oil and the conventional oil's detergents destroy the synthetic oils properties. My boss told me this after he learned the "hard way." Thats how he explained it to me, but the lingo might be a little off since he is a medical engineer and the vocab is similar but not always the same. But I do know that a blended oil is not the same as mixing synthetic and conventional, because the blend is made to work with the right properties as to not break either down.

I did run the 15-50 in my car over the summer. I found that it was heavier and didn't allow my engine to rev quite as fast, but I didn't burn it as fast as the 10-30 I was using before.

Steve