How to Check and Change Your Engine Oil at Home: Complete Guide

Disclosure: This post contains affiliate links. If you click through and make a purchase, we may earn a small commission at no extra cost to you. Thank you for supporting this site!

I’ve cracked open oil pans on engines that sailed past 250,000 miles with nothing but routine 5,000-mile dino oil changes, and I’ve pulled valve covers off 80,000-mile engines that looked like a tar pit because someone believed “lifetime oil” was a real thing. The difference between those two outcomes is about 30 minutes of your time and roughly $35 in materials. Do it wrong—overtorque the drain plug to 30 ft-lbs instead of the spec’d 14 ft-lbs on a GM 5.3L, or slap on a cheap filter that bypasses at 8 psi instead of the OEM’s 18 psi—and you’re looking at stripped threads, low oil pressure, or a $4,500 long-block replacement. This guide covers the socket size you’ll actually need (13mm on most Japanese engines, 15mm on many domestics, but verify yours), the torque wrench setting that keeps your oil pan threads alive, which filter brands actually flow enough at cold start, and how to dispose of the old oil without the EPA knocking on your door. No fluff. Just the steps I use on customer cars and my own projects.

Tools and Materials You’ll Need

Before you crawl under the car, gather everything in one spot. Nothing worse than being under a hot oil pan with a loose drain plug and realizing you left the crush washer on the workbench. Here’s the short list, with specific sizes and brand recommendations based on what actually holds up in a real garage.

• Socket or wrench for the drain plug: Most common sizes are 13mm, 14mm, 15mm, and 10mm. My 2014 Silverado 5.3L uses a 15mm socket. A 2005 Honda Civic uses a 17mm. Check your service manual or crawl under with a set of combination wrenches. A 6-point socket is non-negotiable—12-point sockets round off drain plugs.
• Torque wrench: A ¼-inch or ⅜-inch drive torque wrench that reads in ft-lbs. I use a CDI 1503MFRPH, about $150, but a Tekton ¼-inch drive at $35 gets the job done if you verify calibration every year. Never guess torque on a drain plug.
• Oil filter wrench: Three types work: a cap-style that fits the filter’s flutes (size varies—ACDelco PF63E uses a 76mm, 14-flute cap), a strap wrench for stuck filters, or a claw-style. I keep a Lisle 63600 strap wrench in the drawer for the filters that someone overtightened.
• Drain pan: Minimum 8-quart capacity. A 12-quart pan gives you room for error. The Flow-EZ 70440 holds 15 quarts and has a spout for pouring into disposal containers—worth the $18.
• Crush washer: Most drain plugs use a copper or aluminum crush washer. Dorman 65262 is a 12-pack of M14 washers that covers most GM and Ford applications. Replace it every single change—reusing a crushed washer is why your plug drips.
• Funnel and rags: A simple plastic funnel with a flexible spout works. Keep a roll of shop towels—Scott Shop Towels in the blue roll, not paper towels that disintegrate.
• Safety equipment: Ramps or jack stands—never a scissor jack. Gloves—nitrile, not latex. Safety glasses. Hot oil at 200°F on your forearm will ruin your day.

Total cost for a first-time tool buy: about $80 for the torque wrench, filter wrench, and pan. After that, each oil change runs $25-$45 for conventional or $50-$80 for synthetic depending on your engine’s capacity and viscosity.

Choosing the Right Oil for Your Engine

Oil viscosity isn’t a suggestion—it’s a hydraulic specification. Your engine’s oil pump, bearing clearances, and variable valve timing system were designed around a specific flow rate at a specific temperature. Using 10W-40 in an engine that calls for 0W-20 doesn’t make it “more protected.” It makes the oil pump work harder, reduces flow to the cam phasers, and can trigger a check engine light for VVT performance codes.

Start with what’s printed on the oil fill cap. If it says 5W-30, use 5W-30. If it says dexos1 Gen 2 or Gen 3, that’s the GM specification. For Ford engines built after 2010, look for Motorcraft-specific blends or any oil that meets WSS-M2C946-A or WSS-M2C945-A. Honda engines prefer oils with HTO-06 certification. These aren’t marketing terms—they’re test standards for timing chain wear protection, piston deposit control, and shear stability.

When it comes to brand, you’ve got three tiers. OEM oils like ACDelco dexos1 Full Synthetic 5W-30 ($7.50 per quart at the dealer) are formulated specifically for the engines they’re sold under. They include the correct additive package for the PCV system, the catalytic converter, and the VVT phasers. Premium aftermarket synthetics like Mobil 1 Advanced Fuel Economy 0W-20 ($8.50 per quart at AutoZone) or Pennzoil Ultra Platinum 5W-30 ($9.00 per quart) meet or exceed the OEM spec and often include additional detergents. Budget aftermarket oils like Super Tech Full Synthetic from Walmart.com/” target=”_blank” rel=”nofollow sponsored noopener”>Walmart.com/” target=”_blank” rel=”nofollow sponsored noopener”>Walmart.com/” target=”_blank” rel=”nofollow sponsored noopener”>Walmart ($4.50 per quart) meet the API SN or SP standard but may lack the manufacturer-specific certifications. In most engines, Super Tech is perfectly fine for 5,000-mile intervals. In a turbo direct-injection engine like the EcoBoost 2.0L or the VW 2.0T, I’d spend the extra $4 per quart for the OEM spec oil to reduce LSPI (low-speed pre-ignition) risk.

Conventional vs synthetic: If your engine was designed for conventional oil (pre-2005 mostly), you can switch to synthetic at any mileage. The old myth about synthetic causing leaks in high-mileage engines is false—synthetic oil has smaller molecules, but it doesn’t create leaks where none existed. It will, however, clean out sludge that was previously plugging a leak, so if your engine already had a weeping rear main seal, synthetic will make it drip. In that case, use a high-mileage blend like Valvoline MaxLife High Mileage 5W-30 ($6.50 per quart), which includes seal conditioners that keep old gaskets pliable.

Locating the Drain Plug and Oil Filter

The drain plug is almost always at the lowest point of the oil pan. On a front-wheel-drive car like a 2012 Honda Civic, it’s on the passenger side of the pan, visible from under the front bumper. On a rear-wheel-drive truck like a 2015 Ford F-150, it’s centered on the pan, often behind the front axle. On some European cars—looking at you, BMW N20 engine—the drain plug is recessed into the pan and requires a special socket (8mm hex key, not a standard socket).

The oil filter location varies wildly. On a GM 5.3L V8, it’s on the passenger side of

Disclosure: This article may contain affiliate links. If you make a purchase through these links, we may earn a small commission at no additional cost to you. We only recommend products and services we believe will add value to our readers.