With its new “Annual Protection” motor oil, Mobil 1 is claiming that vehicle owners can go up to 20,000 miles or one full year – whichever comes first – without changing their oil. It’s a bold claim, and one that is backed up by a rigorous testing regimen that, it turns out, included running a Chevrolet Silverado 1500 for 500k simulated miles on a dynamometer using a 20k-mile oil change schedule, and then breaking down the engine to check for excessive wear.
Half-a-million miles is a lot for a light-duty passenger vehicle, even when it’s following a more typical 5k- or 6k-mile oil change interval with synthetic motor oil. But after so many miles with such a long oil change interval, surely the Silverado must have suffered some serious wear on some engine internals, right?
Well, no. Mobil 1 pulled apart the 5.3L EcoTec3 V8 in its 500k-mile Silverado to check the condition of its constituent parts, and found no signs of excessive wear. The engine even outlasted the transmission, which had to be replaced at around 300k miles, and it suffered no sludge buildup or carbon deposits along the way. Wear metals like copper and iron were also within limits by the end of Mobil 1’s testing.
Partly, this is a testament to the Chevrolet Silverado‘s trusty pushrod V8, and partly, it’s a testament to the efficacy of Mobil 1’s Annual Protection motor oil, which has been specially formulated for high-mileage oil change intervals.
Granted, Mobil 1’s dyno testing used a highway mile cycle, and as we all know, highway miles are generally far less trying on a motor than an equivalent distance in city driving. Even still, it’s an impressive feat that, after so much use, the Chevrolet Silverado’s 5.3L V8 was still humming along, happy as a clam.
Watch the video above from Engineering Explained for an in-depth look at all the testing that went into validating Mobil 1 Annual Protection. (Skip ahead to about the 18:38 mark for the Chevrolet Silverado.)