Do her a favor a change the oil, with Valvoline Restore and Protect or Pennzoil Ultra platinum, it will quite down a little and it would be great for the car.
I have a 2010 civic si, I use shell rotella T-6 5w-40 due to burning issues and one quart of Castrol 5w-30 high mileage full synthetic (I’m picky lol- but my car runs smooth and has consistent oil levels on the dipstick through the weeks after oil change)
Pennzoil Platinum Synthetic. My 1988 740 has near excellent compression at 245k og miles.
Buy Castrol Edge engine oil for your Mazda 2.5, but do get the Mazda transmission oil.
I\u2019ve always preferred Castrol gold.
At the very least, make sure you're using quality oil like Mobil or Castrol or Pennzoil.
In my 323i with the 2.5L N52 engine, I use Castrol Edge 5w40 with the appropriate LL specification. Oil consumption is 3000 km per liter, with 190,000 km on the clock.
Castrol is really good considering cost and quality.
I've been using Penzoil ultra platinum full synthetic 0w-20, though it does burn sometimes a quart every oil change.
I tried Castrol and was not a fan, found it burned faster than any oil I used.
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