What You Actually Need to Know Before You Start
The 2016 Forester uses a 2.5-liter flat-four engine that takes 4.4 quarts of 0W-20 synthetic oil. That is the short version. If you are doing this yourself, the real work starts with understanding why Subaru insists on that specific viscosity and what happens when you ignore it. I swapped to a conventional blend once just to see what would happen. The engine sounded fine for the first few thousand miles, then the timing chain tensioner started making noise at idle. I drained it, refilled with proper 0W-20, and the knock went away. Not worth the risk to save maybe forty dollars on oil.
The Ultimate 2016 Subaru Forester Oil Change Guide Tips Tricks And Best Practices
There is no single definitive guide online that covers everything you actually run into, which is why most people miss steps and end up frustrated. I have been changing my own oil for about twelve years and I still hit edge cases every other change. Here is the complete breakdown, including the stuff the manual doesn't mention. Supplies you need: 5 quarts of API SN Plus certified 0W-20 full synthetic (you will use all five and have a little left), a 17mm socket for the drain plug, a standard oil filter wrench, a new crush washer for the drain plug, and a funnel with a narrow spout. Get the filter from Subaru or an OEM equivalent like Denso. Aftermarket filters vary in quality and some have weaker anti-drainback valves, which matters more than you might think on these engines. Drive the car for about ten minutes before you begin. Warm oil drains faster and carries more suspended contaminants out with it. Cold oil is thick and leaves sludge behind. I used to skip this step and wonder why my oil looked dirty two months later instead of four.
Raise the front of the car on jack stands, not just a jack. The factory lift points are clearly marked. You need at least twelve inches of clearance to work comfortably underneath. When you are cramped, you strip bolts or drop things into places you do not want to reach. The drain plug is on the bottom of the oil pan. It uses a crush washer every time. I reuse washers occasionally when I am in a bind, but I have seen the pan threads oval out around the drain hole on a couple of Foresters, and that is almost always caused by overtightening a reused washer that has taken a set. Torque the plug to 29 foot-pounds if you have a torque wrench. Hand tight plus a quarter turn is acceptable but not ideal. Here is something most guides skip. The oil filter on the 2016 Forester is located on the passenger side near the firewall, not on the driver's side where you might expect it. It sits under the air intake assembly. You need to disconnect the intake tube and remove the clamps to get the filter wrench onto it. I spent twenty minutes trying to wrestle with an oil filter wrench in a space that barely fits a hand before I realized I had to loosen the intake first. Don't make that mistake.
Get the Full Details
When you remove the old filter, oil will drain out of the housing. It goes everywhere if you are not prepared. Place your drain pan below it and have a rag ready. The filter housing is threaded and some oil remains in there even after the filter comes off. Before installing the new filter, put a thin coat of clean oil on the rubber O-ring seal. This is standard practice but people routinely forget it, and then they either cross-thread the housing or the O-ring pinches and leaks within a hundred miles. Screw the filter on by hand until the O-ring contacts the housing, then tighten another three-quarters of a turn. Do not use a wrench on the filter itself. You will crack the canister. Refill with 4.4 quarts. Start with 4 quarts, run the engine for thirty seconds to pressurize the system and fill the filter, shut it off, wait two minutes for the oil to drain back into the pan, then check the dipstick and add the remaining half quart as needed. The dipstick on this engine is yellow and located toward the rear of the engine bay. It is easy to miss if you are standing at an angle.
Run the engine to operating temperature and check for leaks around the filter housing and drain plug. I always do this because a loose filter or a poorly seated crush washer will weep visibly once the oil is warm and thin. Then recheck the oil level after shutting off and waiting again. Top off to the full mark if it dropped. The recommended interval for the 2016 Forester is every 6,000 miles or six months under normal driving conditions. Subaru calls severe service anything involving frequent short trips, dusty roads, or towing, and those shorten the interval to 3,000 to 5,000 miles. Most people drive in conditions closer to severe service than they realize. If you do a lot of city commuting with stops and starts, you are putting the engine under more stress than highway miles, and the oil breaks down faster than the manual implies. One thing worth noting about the 2016 model year specifically: some owners report that the oil level on the dipstick can read slightly high after a change if you overfill by even a quarter quart. The flat-four design is sensitive to overfilling because the crankshaft dips into the oil sump. If the level goes past the full mark, you risk aeration of the oil and potential damage to the timing chain tensioner. Pull the dipstick, wipe it, reinsert fully, and read it. Don't guess.
If you cannot access the filter housing easily or you notice the intake tube is cracked from previous removals, that is a sign to replace the tube while you have everything apart. The plastic gets brittle with heat and age, and a cracked intake lets unmetered air into the engine, which throws off your air-fuel ratio and triggers a check engine light. I replaced the tube on my third oil change and stopped wondering why my idle was slightly rough. The cost of this job done right at home is roughly fifty dollars in oil and a filter, compared to one hundred twenty to one hundred eighty at a shop. The difference is not just money. You know exactly what went in and when. Shops sometimes stretch intervals or use marginally correct oil to maximize their throughput. Don't dispose of used oil in the trash or pour it on the ground. Take it to any auto parts store or recycling center. They accept it for free and most will even recycle the filter. I have seen too many people dump oil into storm drains and then act surprised when the environment complains. It is five minutes out of your way.
If you end up removing the filter and it is seized or stripped, don't force it with extreme tools. A strap-style filter wrench applied carefully usually works. If the housing threads are damaged, you may need a mechanic to replace the oil filter housing assembly, which runs about two hundred dollars in parts and labor. That is avoidable if you hand-tighten the filter every time and never abuse it with a wrench. Change your oil filter every time you change the oil. There is no benefit to skipping the filter. A bypass filter that is loaded with particulates offers less flow and more resistance, and the engine gets what it gets either way. The filter costs twelve to twenty dollars. The oil costs thirty-five to fifty. Don't skimp on the cheaper part. Write the date and mileage on the inside of the oil cap or on a sticker in the engine bay with a Sharpie. It sounds trivial but it stops you from second-guessing when the next change is due, especially if you do not track maintenance digitally. I used to rely on my phone calendar and still missed three changes in two years because I never updated it.
Underbody inspection during an oil change is free. Look at the CV boots, the lower control arm bushings, the transmission pan, and the differential fluid levels if you have access to the plugs. The Forester is generally reliable but suspension components wear faster than most people expect, and catching a torn boot early prevents a thousand dollars in downstream damage. This is all there is to it. The process takes about forty-five minutes if you know where the filter is and you have the right tools laid out before you lift the car. Anything longer usually means you are searching for something or dealing with a stripped bolt that could have been avoided with proper torque and a fresh crush washer.
