I did my 3rd oil change since 14k miles using Amsoil 15w40 Signature Series and EAO52 filter so far just using the oil life monitoring system. The oil pressure has been consistent 21psi hot idle and 40psi cruising at 60mph. I've had I bought the truck with 9k miles and first change the oil to Rotella T6 and Mobil 1 oil filter with same oil pressure results using my CTS2 monitor. The other night I changed my oil for the 3rd time using Amsoil and notice now oil pressure at 22psi hot idle and 45psi cruising on the highway also the truck feels to have an increase in power. So why would my oil pressure be higher now on the 4th oil change? I switched to Amsoil because I wasn't happy with the Rotella T6 I noticed a little oil coming from my exhaust and a puff of white smoke on startup but haven't experienced any of this with the Amsoil. Did I get a bad filter or possibly the the engine is broke in now with 33k on it. I also noticed my operating temp is a couple degrees lower too now.