You could use a better oil like Amsoil and actually come out saving money with the longer intervals for changing it, all while treating your internals to a bath in the finest synthetics around.
A case (12 quarts) is good for 2 changes and can be bought for right at a $100 once signed up as a preferred customer ($10/6 months). So you're at $110 for the 5w/30 Sig series and PC account + about $10 shipping, equalling $120 for 2 oil changes worth. At $60 a change, you could easily double (triple would be no issue, but we'll just use double) the amount of miles taking your cost down to $30/change!!!
I personally went from Mobil 1 to Amsoil and couldn't believe the difference. Engine noise down at least 50 %, and she's running smoother than ever!
That is why I have become an independent dealer for Amsoil. In our high heat turbo applications Amsoil is a must IMO and the stats back it up.
I will be setting up a vendor area here shortly...was waiting to announce until I get all my ducks in a row.
Www.motorcitysynthetics.myamsoil.com
Any questions feel free to ask, and there's a plethora of info through the links on the Amsoil websites.
Thx
Rich