Changing the oil in a 2018 Hyundai Tucson depends heavily on which engine option sits under your hood. The 2.0L naturally aspirated engine requires 4.0 quarts, the 1.6L turbocharged engine takes 4.8 quarts, and the larger 2.4L GDI engine demands 4.8 to 5.0 quarts with a filter change. Knowing your precise engine variant prevents overfilling or running your compact SUV low on critical lubrication.
Getting this service right protects your engine from premature wear, maintains fuel efficiency, and keeps your factory warranty intact. Let's break down the exact oil capacities, recommended viscosities, required tools, and a step-by-step change procedure so you can tackle this job cleanly in your own garage.
Engine Options and Exact Oil Capacities
Hyundai offered multiple powerplants for this model year, and every single one uses a slightly different volume of fluid. Check your under-hood emissions sticker or your vehicle owner manual if you aren't sure which engine you drive.
- 2.0L 4-Cylinder (GDI): This base engine holds 4.0 quarts (3.8 liters) of oil when replacing the filter. It's common in entry-level trims.
- 1.6L Turbocharged (T-GDI): This direct-injection turbo engine takes 4.8 quarts (4.5 liters) of oil including the filter change.
- 2.4L 4-Cylinder (GDI): Found in higher trims like the Sport, Limited, and Ultimate, this larger displacement motor requires 4.8 quarts (4.5 liters) to 5.0 quarts of oil.
Recommended Oil Viscosity and Specifications
Using the wrong oil weight creates unnecessary friction on startup and can trigger timing chain tensioner issues, especially on turbocharged variants. Hyundai specifies full synthetic oil for all 2018 Tucson configurations. To explore the bigger picture, check out the detailed analysis by The New York Times.
- For the 2.0L and 2.4L Engines: Use 5W-20 full synthetic motor oil meeting API SN or higher standards. If you live in an extremely cold climate, 0W-20 is also acceptable.
- For the 1.6L Turbo Engine: Use 5W-30 or 0W-30 full synthetic oil meeting API SN Plus or API SP specifications to prevent low-speed pre-ignition (LSPI).
Sticking with major oil brands like Mobil 1, Pennzoil Platinum, or Valvoline Advanced ensures your additives break down slowly and protect internal components over a 5,000 to 7,500-mile interval.
Tools and Supplies Needed
Gathering your gear ahead of time makes the process go smoothly without emergency trips to the auto parts store halfway through the job.
- Motor Oil: 5 to 6 quarts of the correct viscosity (5W-20 or 5W-30 full synthetic).
- Oil Filter: OEM Hyundai filter (part number 26300-35505 or equivalent high-end cartridge). Avoid cheap filters that can fail internally.
- Wrench Set: A 17mm socket and ratchet for the oil pan drain plug.
- Filter Wrench: An end-cap style or band wrench to remove a stuck oil filter.
- Drain Pan & Funnel: To catch old fluid cleanly and refill the engine without spilling onto the exhaust manifold.
- New Crush Washer: Always replace the aluminum or copper crush washer on the drain plug to prevent slow drips.
- Shop Rags & Gloves: To keep your hands clean and wipe up any minor spills.
Step-by-Step Oil Change Procedure
Safety comes first. Always park on level ground, set your parking brake firmly, and chock your rear wheels if you raise the front end with a hydraulic jack and jack stands. Never crawl under a car supported solely by a hydraulic jack.
Step 1: Warm Up and Drain
Run the engine for three to five minutes to warm the oil, making it less viscous so it drains completely along with suspended contaminants. Turn off the engine, pop the hood, and remove the oil filler cap to vent the system. Crawl underneath, position your drain pan beneath the oil pan drain plug, and remove the 17mm bolt counterclockwise. Let the old oil stream out completely for at least ten minutes.
Step 2: Replace the Oil Filter
Locate the oil filter near the front or side of the engine block depending on your specific engine choice. Use your filter wrench to loosen it counterclockwise. Before spinning on the new filter, dip a clean finger into fresh oil and smear a thin film across the rubber gasket. This ensures a proper seal and makes future removal much easier. Screw the new filter on by hand until it seats firmly, then turn it an additional three-quarters turn—do not overtighten with tools.
Step 3: Secure the Drain Plug
Inspect the drain plug threads and install a brand-new crush washer. Thread the plug back into the oil pan by hand to avoid cross-threading. Tighten it down with your 17mm socket to the factory torque specification of 25 to 29 ft-lbs (roughly 35 Nm).
Step 4: Refill and Test
Insert your funnel into the valve cover opening and pour in about half a quart less than your engine's rated capacity (for example, pour 4.0 quarts if your total capacity is 4.8 quarts). Pull the dipstick, wipe it clean, reinsert it, and check the level. Add small amounts until the oil sits precisely at the upper full mark. Start the engine, let it idle for thirty seconds while checking underneath for leaks around the filter and drain plug, then shut it down and recheck the dipstick level on level ground.
Common Mistakes to Avoid
- Overtightening the Drain Plug: Crashing down hard on the 17mm bolt strips the aluminum threads on the oil pan, leading to an expensive repair bill or a permanent leak.
- Forgetting the Old Gasket: Sometimes the rubber O-ring from the old oil filter sticks to the mounting pad. If you screw a new filter on top of an old gasket, it will blow out immediately and dump your entire oil supply onto the highway.
- Mixing Viscosities: Topping off a 5W-20 engine with a heavy 10W-40 oil alters fluid dynamics in tight hydraulic actuators, causing sluggish valve timing responses.
Frequently Asked Questions
How often should I change the oil on a 2018 Hyundai Tucson?
If you mostly drive on short highway commutes under normal conditions, change your oil every 7,500 miles or 12 months. If you deal with severe driving conditions—such as heavy city traffic, dusty unpaved roads, or frequent short trips under freezing temperatures—cut that interval down to 3,750 miles or 6 months.
What happens if I accidentally put too much oil in my Tucson?
Overfilling creates excessive internal pressure caused by the crankshaft churning the pooling oil into foam. This aeration reduces lubrication effectiveness, can blow out gaskets, and may force excess oil past the piston rings into your combustion chambers. If you overfilled by more than half a quart, drain a small amount out using the plug or a fluid extractor.
Do I need to use an OEM Hyundai oil filter?
While aftermarket filters from reputable brands like Wix or Fram work fine, using a genuine Hyundai filter eliminates any potential warranty dispute if an internal lubrication issue arises. OEM filters feature precise internal bypass valve pressures matched specifically to Hyundai oil pumps.
Why does my turbo Tucson consume a bit of oil between changes?
Direct-injection turbocharged engines run at high internal pressures and temperatures, which naturally leads to minor oil consumption over thousands of miles. Check your oil level manually using the dipstick every two fuel fill-ups to catch low levels before any warning lights trigger.
