Originally Posted By: JLTD
I wouldn't use it for an extended drain. Maybe a UOA and leave it in at 5,000 miles?
Right! No conventional oil should be used for extended OCI's(beyond 5K-6K mile OCI) unless your vehicle owner's manual allows such OCI. Such as some Honda's which said that you can go 10K miles on an OCI when using 5W20(under normal driving...not severe). In the earlier days of these 10K OCI's, Honda wasn't specifying regular or synthetic oil in the owner's manual(unless it was 0W), just that they said to use 5W20. Today when a company says to use 0W** oil, we here at Bob's know that(here in the U.S.), 0W** are only synthetic...as far as I am aware!