Given your circumstance, I would use the Chevron Supreme in 5W20 or 5W30 without any hesitation. It's good oil. I would change it at 5K miles or 8K kilometers since you're using it hard.Car is a Chevy Spark. They only come with GMs latest small gas engines, which is a 1.4L NA, non DI, non turbocharged engine.
Synthethic is cheap in the states, here the cheapest "Full synthethic" (Per the bottle label) is at least $13 US or more + tax for the cheaper brands but i can get Chevron Supreme dirt cheap. Manual calls for DEXOS 0W-20 oil.
Usual commute is around 13 miles each way and every day or so i do some errands during the day which adds like 5 - 10 miles.
Not sure what spec the OLM is based on but as far as i can tell, it will reach 0% when i reach 7K to 8K miles.
All the miles are done in city driving, A LOT of stop and go, heavy traffic and prolonged idling.
I previously owned a sub compact city car from a Korean brand which you dont get in the states (Kia Picanto) and did the same OCIs but i drove the morning commute all highway which i wont be doing this time. After a couple years, the engine was running perfectly fine, engine looked fine from the oil fill port and i had no mechanical issues AFAIK but i knew that car was quite good mechanically since lots of people buy them and they are abused.
KIA lists a half-dozen viscosities as suitable in these engines as well as API SM and even SL. No mention whatsoever of synthetic oil... Have their engines grenaded yet ?TWO of my former employers had 2019 Kia Souls and would only do 8k changes on quick lube conventional oil changes. I warned them each that they are asking for an engine to grenade itself but both insisted it was fine, synthetic oil is a scam.
Truth be told we change our oil and especially the filters too often. "Cheap insurance" is "wasted insurance" too often.Theory is nice but plenty of people will insist an analysis is vital but then refuse to accept that the oil could have been used 2x longer.
The simple answer here is to follow the OLM and then do a UOA. Then make a decision based on data, not on personal preferences.
Funny you should ask... because yes is the answer! Hyundai owner and fan here. I chose wisely and avoided the Theta II fiasco.KIA lists a half-dozen viscosities as suitable in these engines as well as API SM and even SL. No mention whatsoever of synthetic oil... Have their engines grenaded yet ?