Settlements Will Bar Deceptive and Unsubstantiated Performance Claims; Dura Lube to Pay $2 Million in Consumer Redress
Back in the late 70's/early 80's my dad's Chevy Monza Spider (305 V8) developed an oil pan leak. I helped my grandfather pull the engine from the car and replace the oil pan. While the engine was out, he checked the inside of the valve covers...was like a mirror. My dad religiously changed the oil every 3000 miles and added STP oil treatment on every oil change. Saved the engine as there wasn't more than a qt of oil in the pan when the engine was pulled.
I remember when I bought my used '07 Tundra back in '10 and sitting in a "new" owners dinner at the dealership. The service manager was touting that with the new synthetics you could go 10k miles between oil changes. I asked him about the oil filter collapsing in the engine. Got a blank stare followed by "it doesn't happen". **I had just changed the oil and the filter was starting to collapse at 5k...Toyota filter.
Oil changes are done on both my vehicles in my signature, every 5k miles, with filter and STP oil additive. Runs better/smoother for me. Your mileage may vary.