Good points which I concur with - my Theta II 2.4L never sees a 5K OCI , I have been changing it at 3,750 mile (severe service) mark . *Curious though , why you would use the M1 & Castrol EP oils for such a short OCI ?Don't go that long mileage route. I consider 4-5k too long with a HyunKia four cylinder Theta 2 engine.
Change every 3-3.5k and leave your +filter on for two OCIs (6-7k).
I change ours every 3k and I'm using +oils like Amsoil, Mobil-1 EP, Castrol EP, Valvoline EP, Pennzoil Ultra Platinum.......etc.
What's most important here (besides keeping the engine innards clean), is making sure that Dipstick oil level is always at the full-mark.
No issues of the sort with the Theta II replacement, Smartstream engines as of yet.Does anybody know if H/K has fixed their issues with their 4 cylinder engines?
I'm pretty sure their 3.3 6 cylinder is a good, trouble free engine.
I believe PP 5W30 being around 9.6 cSt would make a good winter OCI oil .My 2018 Sonata 2.4 Theta II doesn’t burn any oil during an OCI. Currently at 52,000 miles, I change the oil every 5K miles. I switch between 5W-20 and 5W-30. I always use Full Synthetic and have used everything from Pennzoil, Havoline, Quaker State, and Valvoline. Oil filters I always use the Fram 9688 product line. Mostly Fram Extra Guard filters, currently has a Fram Ultra installed. The only time it “used” some oil was in 2021 around 25,000 miles when I used Pennzoil Platinum 5W-30. FWIW, I’ve used Pennzoil Platinum 5W-30 in others vehicles and they exhibited some oil usage too. Pennzoil Platinum 5W-30 is too thin for a 30 grade oil IMO. Their 5W-20 works fine. I dump a bottle of Techron or Gumout into the tank maybe once every 10k-15k miles, if I even remember to.
That’s it, I don’t do anything special and it runs just like new. I’m aware of all the issues these engines are known for, but I won’t let that stop me from enjoying the car. Knock on wood.
It's been stated here at BITOG several times that Vanilla (for your needs) is Group 3. For only a few dollars more, the EP (Triple Action) was a no-brainer purchase for me in the past. I like the 10w30 SP and 0w40 SP (non T/A). Been using a 50-50 frankenblend of both.Anyone care to speculate what the main composition differences would be between the current M1 5W30 vanilla 10K oil and the M1 5W30 EP 20K oil in their newer D1 / Gen 3 , SP rated formulations ?
M1 5w30 vanilla is GP3 while M1 5w30EP is a PAO base stock . (These are rumors that’s going around)Anyone care to speculate what the main composition differences would be between the current M1 5W30 vanilla 10K oil and the M1 5W30 EP 20K oil in their newer D1 / Gen 3 , SP rated formulations ?