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Most newer cars use Gasoline Direct Injection. GDI engines spray fuel directly into the cylinder on the compression stroke. Theoretically, this can give you better fuel economy and cleaner emissions. In reality, it just causes problems.
Normal port fuel injected cars spray fuel into the intake manifold or cylinder head, just behind the intake valve at 60psi of pressure. GDI systems spray directly into the cylinder at 2,000psi. This requires a second fuel pump, that is driven by the camshaft. The high pressure fuel pump in the Tucson is mounted to the valve cover and can leak gas directly into the oil.
When the engine oil has gas in it, the viscosity goes down and it can't protect the engine from wear. Oil must be less than 2% gas. If you drive with bad oil, the engine will wear out prematurely, and start burning oil, it can knock, or throw a rod.
GDI engines can also contaminate the oil with gas through blowby. Some of the high pressure fuel spray can run down the cylinders and get into the oil that way. Compared to older port fuel injected cars that get zero fuel contamination in the oil, newer cars are very bad.
When everything is functioning correctly in my 1.6 T-GDI Gamma engine, my oil changes must be limited to 3,000 miles due to fuel contamination in the oil. Hyundai recommends 5,000 miles oil changes. If I follow manufacturer's service recommendations, I will spend 40% of the time driving on bad oil.
Hyundai is currently in a class action lawsuit for oil consumption for the following cars:
2012-2020 Hyundai Elantra
2009-2018 Hyundai Genesis Coupe
2019-2021 Hyundai Kona
2020-2021 Hyundai Palisade
2010-2012 and 2015-2021 Hyundai Santa Fe
2009-2010 and 2015-2021 Hyundai Sonata
2011–2021 Hyundai Sonata Hybrid
2010-2013 and 2015-2021 Hyundai Tucson
2011-2021 Hyundai Veloster
2020-2021 Hyundai Venue
2010-2021 Kia Forte
2017-2020 Kia Niro
2011-2020 Kia Optima and Optima Hybrid
2012-2021 Kia Rio
2011-2020 Kia Sorento
2012-2021 Kia Soul
2011-2020 Kia Sportage
2018-2021 Kia Stinger
2022 Kia K5
Based on my oil test results from Blackstone Labs, I believe the oil burning, knocking, and catastrophic engine failures happening in this lawsuit are caused by excessive engine wear from driving with oil that is contaminated with gas.
0:00 intro
0:19 1.6 liter Turbo GDI engine
0:59 Oil testing
1:40 first oil test (failure)
3:06 GDI gas in oil contamination from blowby
3:36 oil test after cleaning PCV valve (fail)
4:00 dealer replaced high pressure fuel pump
5:15 ABS fuse and door latch recalls
5:48 GDI cleaning service
7:07 oil test after fix - 3,000 mile oil changes
7:33 oil test 4
8:06 Hyundai recommends you drive on bad oil
9:12 Excessive oil consumption class action lawsuit
11:23 conclusion
