Today was oil change day for my 2015 Challenger SRT 392 ... Even though it had only traveled a little less than 1,200 miles in the past 6 months and still showed 81% Oil Life. I've read articles (like this one from Popular Mechanics https://www.popularmechanics.com/cars/car-technology/a24676402/old-motor-oil/ ) that - like our Owner's Manual - also advocate changing your oil at least twice each year ... also known as every 6 months. Someday I'll track down one of the Dodge engineers and ask about the "6 Months" part of the oil change intervals guidelines so I can hear it from the horse's mouth. And what's different about the 392ci/6.4L engine that its interval is not to exceed 6,000 miles/6-months compared to the 345ci/5.7L engine that has an interval not to exceed 10,000 miles/12-months. Pennzoil Ultra Platinum 0W-40 - 6qts - $45 from an Amazon seller Pennzoil Ultra Platinum 0W-40 - 1qt - $11.15 from NAPA (after my 10% AAA Discount) Mopar SRT #041 Oil Filter - $14.98 ("free" by using my Amazon Prime points) So ... I'm all-in at $71 and have the satisfaction of knowing that it was done right.