🔧 Blazer - Engine Oil & Oil Filter Replacement

This service drains the old engine oil, replaces the oil filter, and refills with the correct oil. Fresh oil protects your Blazer’s engine from wear and keeps the oil-life monitor accurate.

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

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⚠️ Safety & Precautions

• 🛑 Work on level ground and use jack stands (never rely on a jack).
• 🔥 Engine oil can be hot—wear nitrile gloves and safety glasses.
• 🧱 Chock the rear wheels and set the parking brake before lifting.
• 🔧 No battery disconnect is required for this service.

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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 (8-quart minimum)
• Funnel
• Shop rags
• 15mm socket
• 3/8" drive ratchet
• Torque wrench (3/8" drive)
• Oil filter wrench (cap or strap type)
• 24mm socket
• Flat trim tool

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Engine oil (0W-20 full synthetic, dexos1 approved) - Qty: 6 quarts
• Engine oil filter - Qty: 1
• Oil drain plug sealing gasket - Qty: 1

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📋 Before You Begin

• 🧰 Warm the engine 2–3 minutes, then shut it off (warm oil drains faster).
• 🧱 Park on level ground, set the parking brake, and place wheel chocks behind the rear tires.
• ⬆️ Lift the front with a floor jack and support with jack stands at the proper lift points.
• 🧾 If your Blazer has an underbody splash shield, be ready to remove its access panel.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the oil fill cap and prep for draining

• Open the hood and remove the oil fill cap by hand (this helps oil drain smoother).
• Place your drain pan (8-quart minimum) under the oil pan drain plug.

Step 2: Remove the splash shield access (if equipped)

• Use a flat trim tool to release any plastic clips, and use the 3/8" drive ratchet with the correct fastener socket if bolts are present.
• Move the panel aside so you can access the oil pan drain plug and filter area.

Step 3: Drain the engine oil

• Use a 15mm socket with a 3/8" drive ratchet to loosen and remove the drain plug.
• Let the oil drain until it slows to an occasional drip (usually 5–10 minutes).
• Wipe the drain plug clean with shop rags.
• Replace the drain plug sealing gasket if your plug uses one.

Step 4: Reinstall and torque the drain plug

• Thread the drain plug in by hand first to avoid cross-threading.
• Use a torque wrench (3/8" drive) with a 15mm socket to tighten the drain plug.
• Torque to 25 Nm (18 ft-lbs)

Step 5: Replace the oil filter (choose the version that matches what you see)

• Version A: Spin-on canister filter (metal can)
• Use an oil filter wrench (cap or strap type) to loosen the filter, then spin it off by hand.
• Make sure the old rubber gasket came off with the old filter (a stuck gasket can cause a bad leak).
• Put a light film of new oil on the new filter’s rubber gasket using a gloved finger.
• Install the new filter by hand until the gasket touches, then tighten an additional 3/4 turn by hand. Don’t use a wrench to tighten.

• Version B: Cartridge filter in a housing (plastic cap)
• Place the drain pan (8-quart minimum) under the housing area (it will spill).
• Use a 24mm socket with a 3/8" drive ratchet to loosen the filter housing cap, then remove it by hand.
• Remove the old paper filter from the cap and install the new filter.
• Replace the housing cap O-ring if your filter kit includes one (lightly oil the new O-ring before installing).
• Reinstall the cap and tighten with the 24mm socket and torque wrench (3/8" drive) to the spec supplied with the filter kit/service information (caps vary by housing style).

Step 6: Reinstall the splash shield access (if removed)

• Reposition the panel and reinstall clips using the flat trim tool.
• Reinstall any bolts using the 3/8" drive ratchet and the correct socket.

Step 7: Refill with new oil

• Insert a funnel into the oil fill hole.
• Pour in 0W-20 full synthetic, dexos1 approved. Start with about 5.5 quarts, then top off as needed.
• Reinstall the oil fill cap by hand.

Step 8: 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 look underneath with a light for leaks at the drain plug and filter.
• Wait 3–5 minutes, then check the dipstick and add oil as needed to reach the full mark.
• Wipe any spilled oil with shop rags.

Step 9: Reset the Oil Life Monitor

• Turn ignition on (engine off).
• Use the steering wheel controls to display the Oil Life page in the Driver Information Center.
• Press and hold SET/CLR until it resets to 100%.

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✅ After Repair

• 🧪 Recheck the oil level after your first short drive and top off if needed.
• 🕵️ Confirm there are no drips under the drain plug or filter the next morning.
• 🧾 Dispose of used oil and the old filter at an oil-recycling location.

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💰 DIY vs Shop Cost

Shop Cost: $90-$160 (parts + labor)

DIY Cost: $35-$75 (parts only)

You Save: $55-$85 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 0.5-1.0 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.