Pennzoil Ultra Platinum has some of the best cold flow characteristics so I'm not in a hurry to change it even though it's 5W-30.
I’ve used it, no complaints.
From what I've learned the best oil for the Turbo of any model with direct injection which Mazda uses is Pennzoil Ultra Platinum.
One oil that seems to work from all the videos I've watched for cleaning varnish is the Valvoline Restore and Protect.
I use this on my Hyundai Elantra for the past 100k miles ... It's already at 200k and the engine still feels new ... I use Valvoline for everything including power steering ... Valvoline syn blend is a great oil option ...
Valvoline protect and restore has more detergents than any other I believe to clean out thew gunk. I've been running it in my car for 3 oil changes now.
I've seen lots of videos showing the Valvoline restore and protect oil helping to clean engines. If you go that route I'd recommend replacing the oil filter after 500 miles then again at 2500 miles to keep the filters new for any gunk that gets freed up.
Use Penzoil Ultra Plat. Can probably stretch it to 5k miles with no issues.
I've been using Penzoil ultra platinum full synthetic 0w-20, though it does burn sometimes a quart every oil change.
I learned this the hard way switching to Valvoline Restore and Protect 5W-30, destroyed my bearings just like you.
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