Hello everyone, I would like everyones opinion on this. I have a '02 Subaru WRX that I have been using Amsoil ATM 10w30 oil in since the 5k mark (now have 45k). Because of the price and waiting 2-3 weeks for my oil from the local dealer, I have just changed to Pennzoil 10w30. I am planning on changing this oil every 3k miles. Was this a bad move to go from a synthetic to a crude oil? Will this oil be sufficient being that this is a turbo motor. Should I go back to Amsoil. I like Amsoil, but the cost of a oil change with Amsoil is $45 compared to $12 with Pennz. I drive 2500 per month, so I am changing oil alot. Thank you.