How to Change Engine Oil & Replace the Oil Filter on a 2018 GMC Terrain
Step-by-step DIY oil service with required tools, oil specs, filter types, torque specs, and oil life reset
How to Change Engine Oil & Replace the Oil Filter on a 2018 GMC Terrain
Step-by-step DIY oil service with required tools, oil specs, filter types, torque specs, and oil life reset


š§ Terrain - Engine Oil & Oil Filter Replacement
Youāll drain the old engine oil, replace the oil filter, then refill with the correct fresh oil. This keeps your Terrainās turbo engine lubricated and helps prevent wear and sludge.
Difficulty Level: Beginner | Estimated Time: 1.0-1.5 hours
ā ļø Safety & Precautions
- ā ļø Work on level ground and support the vehicle with jack stands before going underneath.
- ā ļø Engine oil can be very hot; let the engine cool 20-30 minutes before draining.
- ā ļø Keep oil off belts, hoses, and electrical connectors; wipe spills immediately.
- ā ļø No battery disconnect is required for this service.
š§ Required Tools
You'll need the following tools for this repair:
- Floor jack (rated 3-ton minimum)
- Jack stands (rated 3-ton minimum)
- Wheel chocks
- Safety glasses
- Nitrile gloves
- Drain pan (at least 8-quart)
- Funnel
- Shop rags
- Torque wrench (10-80 Nm range)
- 15mm socket
- 3/8" drive ratchet
- 3/8" drive extension (6")
- Flat trim clip tool
- Oil filter cap socket (specialty)
- Oil filter wrench (specialty)
š© Required Parts
HowToo sells all the parts you need for this repair:
- Engine oil (dexos1 full synthetic; viscosity per oil fill cap) - Qty: 6 quarts
- Oil filter (cartridge style) - Qty: 1
- Oil filter housing O-ring/gasket (if included separately) - Qty: 1
- Oil filter (spin-on canister style) - Qty: 1
- Drain plug gasket/washer (if equipped) - Qty: 1
š Before You Begin
- Park your Terrain on level ground, set the parking brake, and place wheel chocks behind the rear wheels.
- Warm the engine for 2-3 minutes, then shut it off to help oil drain faster.
- Open the hood and remove the oil fill cap (this helps the crankcase vent while draining).
- Raise the front of the vehicle with a floor jack and support it on jack stands.
šØ Step-by-Step Instructions
Follow these steps in order:
Step 1: Remove the lower splash shield (if equipped)
- Slide the drain pan under the engine area.
- Use a flat trim clip tool to release any push-clips.
- Use a 3/8" drive ratchet with the correct fastener socket (varies by shield) to remove bolts, then lower the panel.
- Keep fasteners in a cup so they donāt vanish.
Step 2: Drain the engine oil
- Locate the oil pan drain plug.
- Use a 15mm socket with a 3/8" drive ratchet to loosen the drain plug, then finish by hand.
- Let the oil drain into the drain pan for at least 10 minutes.
- Reinstall the drain plug by hand first (to avoid cross-threading), then tighten with a torque wrench.
- Torque to 25 Nm (18 ft-lbs)
Step 3: Replace the oil filter (choose the style your Terrain has)
- Cartridge filter (top-mounted housing): This is a filter element inside a plastic/metal cap housing.
- Use an oil filter cap socket (specialty) with a 3/8" drive ratchet and extension to loosen the housing cap slowly.
- Pull the cap up, remove the old filter element, and wipe the housing sealing surface with shop rags.
- Replace the housing O-ring (if used). Lightly coat the new O-ring with fresh oil.
- Install the new filter element, then reinstall the cap and tighten with a torque wrench.
- Torque to 25 Nm (18 ft-lbs)
- Spin-on canister filter (under engine): This is a screw-on metal ācanā filter.
- Use an oil filter wrench (specialty) to loosen the filter, then spin it off by hand into the drain pan.
- Make sure the old rubber gasket didnāt stick to the engine (remove it if it did).
- Lightly oil the new filterās rubber gasket with fresh oil, then install by hand until the gasket contacts, then tighten by hand per filter instructions.
Step 4: Reinstall the splash shield
- Reposition the panel and reinstall bolts with a 3/8" drive ratchet.
- Reinstall push-clips using the flat trim clip tool.
Step 5: Refill with fresh oil
- Lower the vehicle off the jack stands using the floor jack.
- Place a funnel in the oil fill and add oil that meets dexos1 and matches the viscosity listed on your oil fill cap.
- Start by adding about 5 quarts, wait 1 minute, then check the dipstick and top off to the full mark.
- Reinstall the oil fill cap.
Step 6: Start, check for leaks, and verify oil level
- Start the engine and let it idle 30-60 seconds.
- Turn the engine off and look underneath for leaks at the drain plug and filter area.
- Wait 5 minutes, then re-check the dipstick and adjust if needed using the funnel.
Step 7: Reset the oil life monitor
- Using the steering wheel controls, go to the Driver Information Center oil life screen.
- Hold the confirm button to reset (label varies by wheel: typically SET/CLR).
- Verify it resets to 100%.
ā After Repair
- Recheck for leaks after your first short drive.
- Verify the oil level again the next morning on a cold engine.
- Dispose of used oil and the filter at a recycling center or parts store that accepts waste oil.
š° DIY vs Shop Cost
Shop Cost: $90-$160 (parts + labor)
DIY Cost: $35-$70 (parts only)
You Save: $55-$90 by doing it yourself!
Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 0.8-1.2 hours.
šÆ Ready to get started?
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