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1995 Cadillac Sedan DeVille. Bought from the 2nd owner with 95k miles on it. He'd owned it since 1998 and always ran Mobil 1 10w30 oil. We've continued with the Mobil 1 and AC Delco oil filter changes every 3500-4000 miles. Just turned over 193k miles and going strong. Zero oil-related...

We're in Las Vega$. The garage - actually a warehouse - is swamp cooled in the summer and is not heated in the winter. High temp maybe 85* and low temp maybe 55*. No extreme temps. I'll get a pic of some of the oil in a cup and post it tomorrow. Thanks!

First post, so please forgive me if this has been asked already. I've got a bunch of older (ten years +/-) Mobil 1 5w30 oil that's been sitting on a shelf in the garage. We're getting ready to change the oil on my son's 1995 Cadillac DeVille. He's been using Mobil 1 for the past 100k miles...