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I decided to come back and update this post with my final recorded result. I ended up extending the interval up to 13K after doing some more UOA's. The final one I did suggested I could easily go to 15K. So I did it before trading it in just over 300K miles. Had trouble getting any buyer...

Originally Posted By: BalticBob Why do some car owners try to get the last mile out of a oil change? Compared to engine damage from dirty oil, they are not that costly. Even a low price oil and filter changed at 5-8K is better than extending any oil/filter combination. The whole point of a oil...

Thanks all for the feedback and opinions. My OCI is probably closer to 8k now, the 5-7k was an average over the previous 200K miles. It was 5K for the first 100K miles, and I've slowly extended it since then. I don't disagree with the facts, but even if Blackstone Labs gave me hard proof with...

I have never investigated the filters inside to be honest, but since you mentioned that I did some searching and read that the ACDelco filters with an "E" at the end of the part number are the encore. I have noticed a few of those more recently, but never paid attention. I figured the E was for...

Originally Posted By: MetalSlug Nice . My dealer fill Mobil 1 5w30 on my 2013 z71 crew cab 5.3l since day 1 . I hope it mobil 1 or just regular Mobil To op what oil filter you running with it ? Probably 75% of the time I've used AC Delco filters. 5% FRAM when in a pinch and the store was out...

Just did my first UOA. Couldn't be happier with this. 2004 GMC Sierra - 5.3. Mobil 1 5w30 ever since the second oil change at ~1500 miles. OCI has probably averaged 5-7k during that time. 230,000 miles strong - operates just as she did on Day 1. Code: Code: OIL m15w30 MILES IN USE...

2004 GMC Sierra - 5.3L V8. 203,000 miles. Mobil 1 5w-30 since the 2nd oil change. Runs just like it did on Day 1. No significant oil consumption - maybe getting close to 1 quart now. It has always been at least 1/2 quart since the beginning. I usually follow the oil-life meter, which is around...