I service my own cars and its Therapeutic.
Uno- i have been DIY services for 14 years and it has taught me a lot about car maintenance. I do have a knowledgeable mechanic who i have worked with closely for big jobs like clutch kit change and its due for a clutch kit again which i am thinking of DIY.
Auris- bought it at 159 000km, currently sitting on 245 000km and i have been doing DIY Services using the oil that toyota used from new(shell 15w40) using oem oil filter and GUD oil filter. Have done fanbelt(Meyle) change which i got from GW, spark plugs(NGK iridiums), brake fluid flush and gearbox oil change using toyota oil. Only thing it went for at toyota in 2020 was for a recall for replacement of Airbags. Car drives well with no issues.
Mazda CX-5- wife's daily, did DIY oil service using OEM oil filter plus sump plug and used Shell 5w30 oil. it has done 2 000km since oil service and still drives normal.
Auris & CX-5- i fill in the service book myself, keep receipts and a detailed Excel spreadsheet for all cars(including Uno)
I always do extensive research about the job at hand, make sure have correct tools to do the job and all is well. All cars get serviced every 10 000km. With Lockdown and WFH, the Auris and Uno drives less than 10 000km but every 10-12 months get an oil service.
I enjoy doing all maintenance on all the cars including cleaning them as they don't go to car washes which has made me to invest in a vacuum cleaner and pressure washer.