Good question tbf! I’ve seen in the internet praise about this oil, figured I’d give it a try for the hell of it lol. However you are absolutely right, it’s made it this far on my regime 🤣 might have to return the R&P at Walmart!
Yes, 1st oil change was done back in 96 with 20w50 3k mile intervals. 20w50 up until 300k, I think it was mostly a mix of Kendall oil back in the day and Mobil 1. Then it’s been on a mix of 5w40 and 15w50 since then.