5w20 or 5w30 for 2020 Kia Forte EX (South Florida)

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Sep 10, 2024
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Hello everyone

I have a 2020 Kia Forte EX (2.0 liter MPI).

I have spent some time on this site however I'm still unsure as to which oil will best prolong engine life.

I should be specific, I want to prioritize engine longevity over fuel economy and performance. I can't imagine there will be noticeable differences between fuel economy and performance between 5W20 and 5W30, therefore engine longevity is best.

I live in South Florida, and I drive around 30k miles a year. It gets very hot here. I sit a lot in heavy congestion, and I also drive a lot on the highway. I follow the SEVERE maintenance schedule. I just passed 100,000 miles on the car, just did a 2nd tranny drain/fill and oil change and honestly the car runs almost like it's brand new. I use Redline 5W20 every 4,000 miles. I only use Kia OEM filters. I figured out the oil is just becoming pitch black around 4,000 miles. The engine runs super quiet and smooth on this oil, and sometimes I can't even tell if it's actually on, it's that quiet at 100,000 miles. i average about 35mpg on streets and maybe 40-45mpg on the highway.

I have read that in a hotter climate a 5W30 is preferred over a 5W20. My understanding is that Redline has low volatility, so it operates very well in very hot climates. It is less likely to break down at high temperatures. I drive rather gently, I am not racing this car. I've rarely gone over 5,000 RPM and generally never go above 4000 RPM. Needless to say, I really want this car to last at least 250,000 miles. There are have been no mechanical problems on this car. I recently had a boot kit replaced because the one the factory installed was leaking grease. Also, at my next oil change I plan on sending a sample to Blackstone for analysis. I have never done that before.

Thank you!
 
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An often discussed topic, here are a few previous threads you may find helpful. There are many more, search for the most popular topic of "thick vs. thin".

Manual recommendations are just that, recommendations. Not a requirement. There is no "only", people will post things as fact which are anything but.

https://bobistheoilguy.com/forums/threads/5w-20-vs-5w-30-is-there-a-difference.120315/
https://bobistheoilguy.com/forums/threads/5w20-5w30-hyundai-2-0t.214896/
https://bobistheoilguy.com/forums/threads/can-i-use-5w30-instead-of-5w20.168879/
https://bobistheoilguy.com/forums/threads/5w20-vs-5w30-again.333882/
https://bobistheoilguy.com/forums/threads/switch-from-5w-20-to-5w-30.174406/
https://bobistheoilguy.com/forums/threads/5w20-in-engines-calling-for-5w30.7168/
https://bobistheoilguy.com/forums/threads/read-please-5w20-vs-5w30-engine-life-opinions.190402/
https://bobistheoilguy.com/forums/threads/5w-20-vs-5w-30-vs-10w-30.13635/
https://bobistheoilguy.com/forums/threads/is-it-safe-to-use-5w30-oil-instead-of-5w20.78931/
https://bobistheoilguy.com/forums/threads/the-test-has-begun-5w20-vs-5w30.181191/
https://bobistheoilguy.com/forums/threads/accidental-use-of-5w30-instead-of-5w20.276171/
https://bobistheoilguy.com/forums/threads/5w20-vs-5w30.145621/
https://bobistheoilguy.com/forums/threads/5w-20-instead-of-5w-30-wasnt-paying-attention.163149/
https://bobistheoilguy.com/forums/threads/5w-20-vs-5w-30.157634/
https://bobistheoilguy.com/forums/threads/5w20-or-5w30-another-ford-question.354178/
https://bobistheoilguy.com/forums/threads/5w-20-vs-5w-30.323273/
https://bobistheoilguy.com/forums/threads/5w30-instead-of-5w20-synthetic.159547/
https://bobistheoilguy.com/forums/threads/5w20-vs-5w30-oil-in-hyundai-theta-engines.277665/
https://bobistheoilguy.com/forums/threads/5w-20-vs-5w-30-question.180423/
https://bobistheoilguy.com/forums/threads/5w30-in-a-spec-5w20.235910/
https://bobistheoilguy.com/forums/threads/5w30-or-5w20.205143/
https://bobistheoilguy.com/forums/threads/5w30-used-instead-of-5w20.113828/
https://bobistheoilguy.com/forums/threads/5w20-in-place-of-5w30.129175/
https://bobistheoilguy.com/forums/threads/5w20-or-5w30-pick-a-number.229309/
https://bobistheoilguy.com/forums/threads/5w30-vs-5w20-for-hot-vegas-weather.190942/
https://bobistheoilguy.com/forums/threads/5w20-5w30.194679/
https://bobistheoilguy.com/forums/threads/5w20-vs-5w30.8370/
https://bobistheoilguy.com/forums/threads/switch-from-5w20-to-5w30-mileage-factor.264468/
https://bobistheoilguy.com/forums/threads/a-case-for-5w-30-vs-5w-20.310606/
https://bobistheoilguy.com/forums/threads/need-advice-on-oil-5w30-vs-5w20.241604/
https://bobistheoilguy.com/forums/threads/honda-civic-using-5w-30-instead-of-5w-20.316111/
https://bobistheoilguy.com/forums/threads/5w-20-vs-5w-30-in-a-2017-elantra.272169/
https://bobistheoilguy.com/forums/threads/5w30-or-5w20.203196/
https://bobistheoilguy.com/forums/threads/5w30-or-5w20.142897/
https://bobistheoilguy.com/forums/threads/5w-20-and-5w-30-in-ford-engines.65693/
https://bobistheoilguy.com/forums/threads/5w-20-or-5w-30.217109/
https://bobistheoilguy.com/forums/threads/5w20-vs-5w30.292815/
https://bobistheoilguy.com/forums/threads/5w30-or-5w20.11389/
 
I live in S. Florida as well. If you're worried the 5W20 won't cut it because of the ambient temps, don't be. This coming from an owner of Hyundai/Kia vehicles since 2009. One Sonata, a 2.4 ThetaII, used 5W20 (synthetic and conventional) until i traded it in with 188K miles - zero issues. I had no lubrication issues with any of the 9 vehicles. 5W-30, however, will work just fine to. But it's not needed.

Between a 20 and a 30 API/ILSAC motor oil:
  • Yes a 20 will get better fuel economy but hardly noticeable outside testing environment
  • Yes a 30 will give better wear protection but hardly noticeable outside testing environment
Just to many variables to make general statements about MPG and engine longevity between oils with an HTHS of 2.6> or <2.9.

If it's leaking, go with a HM.
 
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Wouldn't hurt anything if you switched to 5W-30. I use that in my Hyundai/Kia vehicles (sometimes 10W-30, the Rio sometimes 10W-40.) That's with DI engines though. Hyundai/Kia DI engines tend to start burning oil after a while.
 
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An often discussed topic, here are a few previous threads you may find helpful. There are many more, search for the most popular topic of "thick vs. thin".

Manual recommendations are just that, recommendations. Not a requirement. There is no "only", people will post things as fact which are anything but.

https://bobistheoilguy.com/forums/threads/5w-20-vs-5w-30-is-there-a-difference.120315/
https://bobistheoilguy.com/forums/threads/5w20-5w30-hyundai-2-0t.214896/
https://bobistheoilguy.com/forums/threads/can-i-use-5w30-instead-of-5w20.168879/
https://bobistheoilguy.com/forums/threads/5w20-vs-5w30-again.333882/
https://bobistheoilguy.com/forums/threads/switch-from-5w-20-to-5w-30.174406/
https://bobistheoilguy.com/forums/threads/5w20-in-engines-calling-for-5w30.7168/
https://bobistheoilguy.com/forums/threads/read-please-5w20-vs-5w30-engine-life-opinions.190402/
https://bobistheoilguy.com/forums/threads/5w-20-vs-5w-30-vs-10w-30.13635/
https://bobistheoilguy.com/forums/threads/is-it-safe-to-use-5w30-oil-instead-of-5w20.78931/
https://bobistheoilguy.com/forums/threads/the-test-has-begun-5w20-vs-5w30.181191/
https://bobistheoilguy.com/forums/threads/accidental-use-of-5w30-instead-of-5w20.276171/
https://bobistheoilguy.com/forums/threads/5w20-vs-5w30.145621/
https://bobistheoilguy.com/forums/threads/5w-20-instead-of-5w-30-wasnt-paying-attention.163149/
https://bobistheoilguy.com/forums/threads/5w-20-vs-5w-30.157634/
https://bobistheoilguy.com/forums/threads/5w20-or-5w30-another-ford-question.354178/
https://bobistheoilguy.com/forums/threads/5w-20-vs-5w-30.323273/
https://bobistheoilguy.com/forums/threads/5w30-instead-of-5w20-synthetic.159547/
https://bobistheoilguy.com/forums/threads/5w20-vs-5w30-oil-in-hyundai-theta-engines.277665/
https://bobistheoilguy.com/forums/threads/5w-20-vs-5w-30-question.180423/
https://bobistheoilguy.com/forums/threads/5w30-in-a-spec-5w20.235910/
https://bobistheoilguy.com/forums/threads/5w30-or-5w20.205143/
https://bobistheoilguy.com/forums/threads/5w30-used-instead-of-5w20.113828/
https://bobistheoilguy.com/forums/threads/5w20-in-place-of-5w30.129175/
https://bobistheoilguy.com/forums/threads/5w20-or-5w30-pick-a-number.229309/
https://bobistheoilguy.com/forums/threads/5w30-vs-5w20-for-hot-vegas-weather.190942/
https://bobistheoilguy.com/forums/threads/5w20-5w30.194679/
https://bobistheoilguy.com/forums/threads/5w20-vs-5w30.8370/
https://bobistheoilguy.com/forums/threads/switch-from-5w20-to-5w30-mileage-factor.264468/
https://bobistheoilguy.com/forums/threads/a-case-for-5w-30-vs-5w-20.310606/
https://bobistheoilguy.com/forums/threads/need-advice-on-oil-5w30-vs-5w20.241604/
https://bobistheoilguy.com/forums/threads/honda-civic-using-5w-30-instead-of-5w-20.316111/
https://bobistheoilguy.com/forums/threads/5w-20-vs-5w-30-in-a-2017-elantra.272169/
https://bobistheoilguy.com/forums/threads/5w30-or-5w20.203196/
https://bobistheoilguy.com/forums/threads/5w30-or-5w20.142897/
https://bobistheoilguy.com/forums/threads/5w-20-and-5w-30-in-ford-engines.65693/
https://bobistheoilguy.com/forums/threads/5w-20-or-5w-30.217109/
https://bobistheoilguy.com/forums/threads/5w20-vs-5w30.292815/
https://bobistheoilguy.com/forums/threads/5w30-or-5w20.11389/
Done - standing by for next series 😵‍💫
 
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