Send your used oil to Blackstone or Amsoil for analysis and all of your questions about oil will be answered.
The best all rounder motor oils currently in the US are Pennzoil Ultra Platinum and Amsoil Signature, the latter you can run for at least 20k normal service or 15k extreme service.
I got better results from signature 5w30 at 11,200 mi than I did from Motorcraft “full synthetic(lies) at 4300mi. So I change my amsoil at 8-10k and my Pennzoil ultra platinum at 7500.
I like amsoil 5w-30 and do a liquimoly engine flush with every oil change.
On a new car, I change at 750, then again at 3000, and after that I do my regular once per year or 25,000 miles, whichever comes first, as stated on Amsoil Signature. I've been using this oil for decades in cars, trucks, and tractors. It's incredibly good oil.
I have run 0w20 in my 2013 Mazda 3 skyactiv for 244,000 miles. It doesn't burn or leak any oil between changes. I change the oil and filters every 5-6,000 miles.
I do 3k with Amsoil SS as well. Blackstone analyses of TBN show I could easily do 5,000k.
5000 miles with a quality full synthetic will serve you well for the life of your vehicle.
I have amsoil in mine. I went 7500 once. Im sure anyone can go 10k with amsoil but it will be dark oil when u change it out lol
they only say you can do that with their Mazda-branded oil. That stuff tends to be expensive.
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