Just catching up..
2018 May: Oil and filter change, tire rotation, and general inspection done at L.A. Mazda in Leduc, AB at 7000 kms.
2018 Oct: New winter tires installed on OEM wheels at 13000 km. Pennzoil Ultra Platinum 5W-30 and Mazda OEM filter, tire rotation, and general inspection done at home at 14000 km.
2019 May: Pennzoil Ultra Platinum 5W-30 and Mazda OEM filter, tire change to summer wheels, and general inspection done at home at 21500 km. Winter wheels have 6000 kms.
2019 Oct: UoA sample taken for analysis. Castrol Edge 5W-30 and Mazda OEM filter, and general inspection done at home at 29000 kms. Winters installed. Summer wheels have 10127 kms.
2020 May: Castrol Edge 5W-30 and Mazda OEM filter, and general inspection done at home at 37000 kms. Summers installed. Winters have 14396 kms (8396 this season).
2020 Oct: Castrol Edge 5W-30 and Mazda OEM filter, and general inspection done at home at 45000 kms. Winters installed. Summers have 20119 kms (9992 this season).
2021 May: Noted low coolant level. UoA sample taken for analysis. Castrol Edge 5W-30 and Mazda OEM filter, and general inspection done at home at 53000 kms. Summers installed. Winters have 18881 kms (4485 this season).
2021 Aug: Coolant low. Previous UoA indicated high levels of potassium. New UoA sample taken. Kirkland 5W-30 and Mazda OEM filter, and general inspection done at home at 58500 kms.
2021 Nov: Coolant low again. Previous UoA indicated high levels of potassium, as before. New UoA sample taken. Kirkland 5W-30 and Mazda OEM filter, and general inspection done at home at 64000 kms. Winters installed. Summers have 32220 kms (12101 this season).