I changed shezhot to Mobile 1 and she has such a nice smoothness about her. It was past due for her change and I decided that since I have put 9728 miles in 5 months that an upgrade in oil would help me extend my miles btwn changes. I love it so far.
I too am sticking with Mobil1. As someone who tries to change his oil every 3k miles, buying Royal Purple would get rather expensive. Although I may switch the Z over and just leave the Si on Mobil1. We'll see. Dave just changed, we'll see what he says
I just. made the switch to synthetic; nothing noticeable to me. Then again, my air filter was really dirty, so I replaced it and **** if the new one isn't louder! Now, off to ebay to find a JWT charger
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