With my last oil change I started to use a full synthetic oil(5W30) in my 2010 HHR. The oil indicator shows I still have 29% oil life but the check engine light has come on and the code is P0010. Wh
Can changing to a full synthetic oil(5W30) cause slug to build up in the
engine. I am getting 23.8 MPG's around town and 33.6 MPG on the highway.
Full synthetic should not cause any problems.
P0010 "A" Camshaft Position Actuator Circuit (Bank 1). You're fine with Synthetic, I always use it, and my 2006 is now on high mileage synthetic.
Use the grade specified by the factory. Synthetic will not build sludge.
Your gas mileage is quite good in my opinion.
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