🔧 CX-30 - Engine Oil & Oil Filter Change

You’ll drain the old engine oil, replace the oil filter, then refill with the correct fresh oil. This keeps your CX-30’s engine lubricated and helps prevent wear and sludge buildup.

Difficulty Level: Beginner | Estimated Time: 0.8-1.5 hours

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⚠️ Safety & Precautions

• ⚠️ Work on level ground and support the CX-30 with jack stands before going underneath.
• ⚠️ Engine oil can be hot; let the engine cool 15–30 minutes if it’s fully warmed up.
• ⚠️ Wear gloves and safety glasses; oil can irritate skin and eyes.
• ⚠️ Keep oil off belts and exhaust parts to avoid smoke/burning smell.
• ⚠️ Battery disconnect is not required for this job.

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🔧 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 towels
• Ratchet
• 17mm socket
• Torque wrench (10–80 Nm range)
• Oil filter wrench (cup or band style)
• 8mm socket
• 10mm socket
• Phillips screwdriver
• Trim clip removal tool

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Engine oil (0W-20 full synthetic) - Qty: 5 quarts
• Oil filter - Qty: 1
• Oil drain plug crush washer/gasket - Qty: 1

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📋 Before You Begin

• Park your CX-30 on level ground, set the parking brake, and place wheel chocks behind the rear wheels.
• Run the engine for 2–3 minutes, then shut it off (this helps the oil drain better without being dangerously hot).
• Open the hood and remove the oil fill cap (this helps the crankcase vent while draining).
• Lay out your drain pan, new filter, and new crush washer so you’re not searching while oil is draining.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Raise and support the front of the CX-30

• Use a floor jack (rated 3-ton minimum) to lift the front lifting point.
• Place jack stands (rated 3-ton minimum) at the proper support points and lower onto them.
• Give the vehicle a gentle shake to confirm it’s stable before going underneath.

Step 2: Remove the lower under cover / access panel

• Position the drain pan (at least 8-quart) under the engine area first (some oil can drip while you work).
• Use an 8mm socket and 10mm socket to remove any small bolts holding the front under cover/access panel.
• Use a Phillips screwdriver and trim clip removal tool to remove plastic clips. Clips break easily—pry gently.

Step 3: Drain the engine oil

• Slide the drain pan (at least 8-quart) directly under the oil drain plug.
• Use a ratchet with a 17mm socket to loosen the drain plug, then finish removing it by hand.
• Let the oil drain until it slows to an occasional drip (typically 5–10 minutes).

Step 4: Reinstall the drain plug with a new crush washer

• Remove the old washer from the drain plug and install the new oil drain plug crush washer/gasket.
• Thread the drain plug in by hand first (prevents cross-threading).
• Use a torque wrench (10–80 Nm range) with a 17mm socket to tighten the drain plug: Torque to 30–41 Nm (22–30 ft-lbs).

Step 5: Remove the old oil filter

• Move the drain pan (at least 8-quart) under the oil filter area (more oil will spill here).
• Use an oil filter wrench (cup or band style) to loosen the filter, then spin it off by hand.
• Check that the old rubber gasket came off with the old filter (a stuck gasket can cause a leak).

Step 6: Install the new oil filter

• Dip a gloved finger in fresh oil and lightly oil the new filter’s rubber gasket.
• Spin the new filter on by hand until the gasket touches the engine, then tighten by hand an additional 3/4 turn.
• Hand-tight is correct; don’t over-tighten.

Step 7: Reinstall the under cover / access panel

• Reposition the cover and start bolts by hand.
• Use an 8mm socket, 10mm socket, Phillips screwdriver, and trim clip removal tool to reinstall all fasteners.

Step 8: Refill with fresh engine oil

• Lower the CX-30 off the stands using the floor jack (rated 3-ton minimum).
• Insert a funnel into the oil fill hole.
• Pour in 0W-20 full synthetic, starting with about 4.5 quarts, then add as needed.
• Total fill (with filter change) is typically about 4.8 quarts; confirm final level by dipstick, not just the bottle amount.
• Use shop towels to wipe any spilled oil.

Step 9: Start, check for leaks, and verify the oil level

• Start the engine and let it idle for 30–60 seconds.
• Shut the engine off and wait 3–5 minutes for oil to settle.
• Pull the dipstick, wipe it with shop towels, reinsert, then re-check level and top off using the funnel if needed.
• Look underneath for leaks at the drain plug and oil filter.

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✅ After Repair

• Recheck for drips after your first short drive.
• Reset the oil maintenance reminder on the Mazda display:
  • Use the commander knob to go to Information > Vehicle Status Monitor > Maintenance Details > Oil Change > Reset
  • If your menu looks different, try: Applications > Vehicle Status Monitor > Maintenance > Oil Change > Reset
• Dispose of used oil and the old filter at an oil recycling center/auto parts store (do not pour it out).

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💰 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 0.7-1.0 hours.

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🎯 Ready to get started?

HowToo makes it easy: same-day/2-day shipping on every part, plus all the tools and specialty tools you need! Check out the parts and tools sections below to add everything to your cart.