... in my 530i, but by the time the 1-year mark arrives, I'll only have about 5K miles on it. The engine usually does get up to proper operating temp whenever I take the car out. My last OCI on GC was 10K miles, but I was driving a lot more last year, so it took less than a year to rack up 10K miles. I'm thinking I'll just pull a sample at the 1-year mark and do a UOA. If the results come back OK, maybe I'll just keep it in there until next summer. It's a 7qt sump. Any thoughts?