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Years ago I noticed the pleasant smell of Pennzoil Platinum I was using at the time. All the used oil analysis I've seen over the years don't seem to account for the smell of an oil, so I don't consider it an important reason on which to base my oil choices. As far as beers go, the nose most...

I drove my first car (used 1989 Mazda MX-6) back in the 1990s from 47,000 mi. to 185,000 mi., city driving, many short trips, 7500 mi. OCIs on whatever name brand conventional 5w30 oil I found on sale. I gave it to my brother and he put ten of thousands more miles on it. IIRC I was adding 3/4...