I have been running 20k OCI's on 0w30 SSO with a 1qt top off at 10k, I have been doing this for the last 85,000 miles with excellent results it is an amazing oil. I am not happy at all with them discontinuing SSO and replacing it with AZO, on peper the AZO does not look as stout as the SSO so I am not really sure what I am going to do on my next change?