DIY Engine Oil Change for Your Subaru Impreza

Keeping your Subaru Impreza in peak condition is paramount for its longevity and performance, and one of the most fundamental aspects of this maintenance is regularly changing its engine oil. While it might seem like a daunting task reserved for professional mechanics, performing an oil change yourself is a rewarding and relatively straightforward process that can save you money and give you a deeper understanding of your vehicle. This comprehensive guide will walk you through everything you need to know, from understanding different oil types to a detailed, step-by-step procedure for keeping your Impreza's heart well-lubricated.

Why Engine Oil Changes Are Paramount for Your Subaru

Engine oil is the lifeblood of your Subaru's engine. It performs multiple critical functions: lubricating moving parts to reduce friction and wear, cooling engine components by carrying away heat, cleaning the engine by suspending dirt and contaminants, and forming a seal between the piston rings and cylinder walls. Over time, engine oil degrades due to heat, oxidation, and contamination from combustion by-products. This degradation reduces its ability to perform these vital functions, leading to increased friction, greater wear on components, reduced fuel efficiency, and potentially severe engine damage.

Neglecting regular oil changes can lead to sludge build-up, blocked oil passages, and ultimately, premature engine failure. For a 2013 Subaru Impreza, for instance, it's generally recommended to change the oil and filter every 3,000 to 5,000 miles, though this can vary based on driving conditions and the type of oil used. Adhering to these intervals, or those specified in your vehicle's owner's manual, ensures your engine remains protected and operates efficiently. Think of it as preventative medicine for your car; a small investment now saves a large repair bill later.

Deciphering Engine Oil Types: Synthetic vs. Conventional

When it comes to engine oil, you'll primarily encounter two main categories: synthetic and conventional. Understanding the differences is crucial for making an informed choice for your Impreza.

Conventional oil is refined from crude oil and has been the standard for decades. It's generally more affordable and works perfectly well for many older vehicles or those that undergo frequent oil changes. However, it's more susceptible to breaking down under extreme temperatures and can accumulate deposits more readily.

Synthetic oil, on the other hand, is engineered through a more advanced chemical process. It offers superior performance, especially in extreme temperatures (both hot and cold), provides better engine protection, and resists breakdown more effectively. This means synthetic oils often allow for longer oil change intervals, making them a convenient choice for drivers seeking extended maintenance periods. Many modern vehicles, including various Subaru models, are designed to utilise 100% synthetic oil, while others may allow a synthetic blend, which is a mix of synthetic and conventional oil.

Here's a quick comparison to help you decide:

While conventional oil is suitable if approved for your Impreza and you change it regularly, synthetic oil is often the preferred choice for its enhanced protective qualities and extended life. Brands like Mobil 1 High Mileage full synthetic motor oil are highly trusted, especially for engines with over 75,000 miles, designed to last up to 10,000 miles between changes. Subaru itself highly recommends its own Subaru Synthetic Motor Oil, particularly for turbocharged engines, though it provides excellent performance for all engine types.

Selecting the Correct Oil for Your Impreza

The most critical piece of information when choosing engine oil is found in your Subaru's owner's manual. This document will specify the correct viscosity grade for your particular model year and engine type. Viscosity refers to the oil's resistance to flow; a lower number indicates thinner oil, which flows more easily, especially in cold temperatures, while a higher number indicates thicker oil. Common viscosity grades for Subaru Imprezas include 0W-20, 0W-30, 5W-20, 5W-30, and 10W-30.

For example, a 2013 Subaru Impreza typically requires 0W-20 synthetic oil. This specific grade, often found in products like Pennzoil Ultra Platinum Full Synthetic 0W-20 Motor Oil or Genuine Subaru 0W-20 Synthetic Motor Oil, is formulated to handle the low-friction design of Subaru's non-turbocharged engines and performs well across a wide range of operating conditions. Always match the oil to the manufacturer's specification to ensure optimal engine performance and longevity.

Essential Tools and Safety First

Before you get started, gather all the necessary tools and supplies. This preparation not only makes the process smoother but also ensures your safety. You'll need:

• New engine oil (correct type and viscosity for your Impreza)
• New oil filter (e.g., Genuine Subaru Oil Filter)
• Oil drain pan (to collect old oil)
• Socket wrench with a 17mm socket (for the drain plug)
• Oil filter wrench or an old belt (if the filter is too tight to remove by hand)
• Funnel (for pouring new oil)
• Clean rags or shop towels
• Jack and jack stands (if your car is too low to access the drain plug/filter)
• Wheel chocks (optional, but recommended for extra safety)
• Safety glasses and gloves (highly recommended)

Safety is paramount. Always wear safety glasses to protect your eyes from potential splashes of hot oil, battery acid, engine coolant, or brake fluid, all of which can be harmful. If you need to raise your vehicle, always use sturdy jack stands on a level surface and follow safe jacking procedures. Never rely solely on a jack when working underneath a car. Ensure the vehicle is stable and secure before you begin.

Your Step-by-Step Guide to Changing Your Subaru Impreza's Engine Oil

This guide uses a 2013 Subaru Impreza as an example, but the principles apply broadly to other models like the 2006 or 2017 Imprezas. Always refer to your specific owner's manual for precise details.

Step 1: Preparation & Identification

Begin by ensuring your engine is slightly warm but not hot. A warm engine allows the oil to drain more easily. If your Impreza is too low to the ground, carefully raise it using a jack and secure it firmly on jack stands. Place wheel chocks on the wheels that remain on the ground for added stability.

Next, familiarise yourself with the key components: the oil fill cap (oil intake), the dipstick, the oil filter, and the oil drain plug. It's crucial to identify the oil fill cap first; you want to ensure you can open it to pour in new oil before you drain the old. For most Subarus, the oil drain plug is typically found centrally under the engine, roughly in line with the front licence plate, and it often requires a 17mm socket.

Step 2: Draining the Old Oil

Position your oil drain pan directly beneath the drain plug. Using your 17mm socket wrench, carefully loosen the drain plug. Once it's loose, apply inward pressure as you unscrew it by hand to prevent oil from gushing out prematurely. With a quick, smooth motion, remove the plug and allow the hot oil to drain completely into the pan. This can take several minutes. To help the oil drain faster, go to the top of the engine and undo the oil fill cap and pull the dipstick out slightly.

Step 3: Replacing the Oil Filter

While the oil is draining, locate the oil filter. For many Subarus, the oil filter is easily accessible. You might be able to unscrew it by hand. If it's too tight, use an oil filter wrench or even wrap an old belt around it for better grip. Once loosened, unscrew it completely, being prepared for a small amount of residual oil to spill out. Place the old filter in your drain pan. Use a clean rag to wipe clean the oil filter mounting surface on the engine, ensuring no debris remains.

Before installing the new oil filter, it's good practice to prepare it. Pour a small amount of fresh oil into the new filter (about one-third to half full) to pre-lubricate it. Also, apply a thin film of new oil to the rubber gasket on the new oil filter. This lubrication helps create a proper seal and prevents the filter from seizing to the engine, making future removal easier.

Step 4: Refilling with Fresh Oil

Once the old oil has finished draining, reinstall the drain plug. Hand-tighten it first, then use your wrench to give it a final snug turn. Be careful not to overtighten, as this can strip the threads. Next, screw on the new oil filter firmly by hand until it's snug, then give it about another quarter to half turn. Do not overtighten with a wrench, as this can damage the filter or gasket.

Now, place the funnel into the oil fill opening on your engine. Consult your owner's manual for the exact oil capacity for your Impreza. Slowly pour in the recommended amount of new, fresh oil. Once filled, replace the oil fill cap and reinsert the dipstick fully.

Step 5: Final Checks

Start your engine and let it run for a minute or two. This allows the new oil to circulate throughout the engine and fill the new oil filter. While the engine is running, quickly check for any leaks around the drain plug and the oil filter. If you see any, turn off the engine immediately and tighten the respective component.

Turn off the engine and wait for a few minutes (typically 5-10 minutes) to allow the oil to settle back into the oil pan. Then, pull out the dipstick, wipe it clean, reinsert it fully, and pull it out again to check the oil level. The oil level should be between the 'min' and 'max' marks on the dipstick, ideally close to the 'full' mark. If it's low, add a small amount of oil and recheck. Avoid overfilling. Once satisfied, remove your jack stands and lower your vehicle.

Properly dispose of your old engine oil and filter at an authorised recycling centre. Never pour used oil down the drain or into the ground.

Frequently Asked Questions (FAQs)

Q: Can I use synthetic oil in my older Subaru Impreza, such as a 2006 model?
A: Yes, generally, you can use synthetic oil in most modern vehicles, including older Imprezas, even if they originally used conventional oil. Synthetic oil often provides better protection and can extend oil change intervals. However, always confirm the recommended viscosity in your owner's manual.

Q: How often should I change my oil?
A: The frequency depends on your vehicle's year, engine type, the oil used, and your driving habits. For many Imprezas, conventional oil changes are recommended every 3,000 to 5,000 miles. If using synthetic oil, intervals can extend to 7,500 to 10,000 miles or more. Always consult your owner's manual for precise manufacturer recommendations.

Q: What if I can't unscrew the oil filter by hand?
A: It's common for oil filters to be very tight. If you can't remove it by hand, you'll need an oil filter wrench. These tools provide extra leverage and grip, making removal much easier. An old belt wrapped around the filter can also provide enough grip in a pinch.

Q: How do I reset the oil service maintenance light on my Subaru Impreza?
A: The procedure for resetting the oil service light varies significantly between different Subaru Impreza model years and trim levels. Unfortunately, specific instructions are not universally applicable. Your best resource for this procedure will be your vehicle's owner's manual, which provides model-specific steps, often involving button presses on the dashboard or infotainment system.

Q: What do the numbers in oil viscosity (e.g., 0W-20) mean?
A: The 'W' stands for 'Winter', and the number before it (e.g., 0W) indicates the oil's viscosity at cold temperatures. A lower number means the oil is thinner in cold weather, allowing for easier starting and better lubrication upon cold start. The second number (e.g., 20) indicates the oil's viscosity at standard operating temperatures. It represents how thick the oil is when the engine is hot. Always use the viscosity recommended by your manufacturer.

Performing your own engine oil and filter change is a rewarding task that contributes significantly to the health and longevity of your Subaru Impreza. By following these steps and prioritising safety, you can ensure your vehicle continues to run smoothly, efficiently, and reliably for many miles to come. Regular maintenance is key, and taking it into your own hands empowers you to keep your cherished Subaru in top form.

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