Figuring out the 2018 acadia oil type is actually pretty straightforward once you know which engine is sitting under your hood, but it's one of those things you definitely don't want to guess on. Since GMC offered two different engines for that model year, the oil you grab off the shelf at the auto parts store could vary depending on whether you're driving the fuel-sipping four-cylinder or the more powerful V6.
If you've ever stood in the oil aisle staring at a wall of plastic bottles, feeling slightly overwhelmed by all the numbers and labels, you aren't alone. It's a lot to take in. Let's break down exactly what your Acadia needs so you can get back on the road without worrying about your engine's health.
The Short Answer: Which Oil Do You Need?
For the 2018 GMC Acadia, the oil type is split by engine size. If you have the 2.5L 4-cylinder engine, you're going to need SAE 0W-20 oil. If you have the meatier 3.6L V6 engine, you'll want to reach for SAE 5W-30.
The most important thing to look for, regardless of the viscosity (those numbers like 5W-30), is the dexos1 approved label. GMC is pretty strict about this. Using an oil that doesn't meet the "dexos" standard can technically cause issues with your warranty if something goes wrong, but more importantly, it's the standard the engine was literally designed to run on.
Understanding the "dexos" Requirement
You'll see the "dexos" logo on a lot of bottles, but why does it matter? Basically, GM (the folks who make GMC, Chevy, and Buick) decided that the standard industry tests weren't tough enough for their modern engines. They created their own set of specifications to ensure the oil resists aeration, keeps the engine cleaner, and handles heat better.
For a 2018 model, you should specifically look for dexos1 Gen 2 or the newer Gen 3. The Gen 3 stuff is backward compatible, so if that's all you see on the shelf, it's perfectly fine to use in your Acadia. It's actually better at preventing "low-speed pre-ignition," which is just a fancy way of saying it keeps your engine from knocking and pinging when you're trying to speed up from a stop.
How Much Oil Should You Buy?
Knowing the 2018 acadia oil type is only half the battle; you also need to know how much to pour in. There's nothing more annoying than being half a quart short when you're finishing up a driveway oil change.
- 2.5L 4-cylinder: This engine takes 5.0 quarts (or about 4.7 liters) of oil.
- 3.6L V6: This one is a bit thirstier and requires 6.0 quarts (or about 5.7 liters).
I always recommend buying a 5-quart jug and a single individual quart if you have the V6. It usually ends up being cheaper than buying six individual bottles. Plus, it's never a bad idea to have a little bit of extra oil sitting in the garage just in case you need a top-off down the line.
Does Synthetic Matter for the 2018 Acadia?
Honestly, since you're required to use dexos1 approved oil, you're almost certainly going to be buying a full synthetic or a very high-quality synthetic blend. Most "conventional" old-school oils can't meet the dexos standards anyway.
Full synthetic is really the way to go for the Acadia. These engines, especially the V6, run relatively hot and have some intricate timing chain setups that really rely on clean, high-quality lubrication. Synthetic oil flows better in the winter and doesn't break down as fast in the summer heat. If you want your Acadia to last well past the 100,000-mile mark, don't cheap out here.
When Should You Change the Oil?
Your Acadia comes equipped with an Oil Life Monitoring System. It's that percentage you see when you scroll through your dashboard menu. It doesn't just count miles; it actually looks at how you drive, the temperature outside, and how often you're idling to calculate when the oil is actually worn out.
That said, most mechanics (and I tend to agree) suggest not waiting until it hits 0%. A good rule of thumb for the 2018 Acadia is to change it every 5,000 to 7,500 miles. If you do a lot of short trips where the engine doesn't have time to fully warm up, or if you live somewhere where the winters are brutal, sticking closer to that 5,000-mile mark is cheap insurance.
Picking the Right Filter
You can buy the best 2018 acadia oil type in the world, but if you put a cheap, $3 filter on it, you're doing yourself a disservice. For the Acadia, the AC Delco filters are usually the safest bet since they're the original equipment.
- For the 3.6L V6, you're typically looking for an AC Delco PF63.
- For the 2.5L 4-cylinder, it's often the AC Delco UPF64R.
Double-check the fitment guide at the store, but sticking with the OEM (Original Equipment Manufacturer) filters is usually a smart move to ensure the bypass valves and flow rates are exactly what the engine expects.
A Few Tips for the DIY Crowd
If you're planning on changing the oil yourself, the 2018 Acadia is actually pretty friendly to work on. The drain plug is usually a 15mm, which is standard for most GM vehicles.
One little "pro tip" for the V6 owners: the oil filter is angled in a way that can get a bit messy when you unscrew it. I usually like to tuck some old rags or a piece of cardboard underneath it to channel the dripping oil into the drain pan rather than letting it run down the side of the engine block. It saves you from that "burning oil" smell the next time you drive.
Also, don't forget to reset that oil life monitor on the dash! You usually do this by navigating to the oil life screen using the steering wheel buttons and holding down the "OK" or "Check" button until it jumps back up to 100%.
What if You Use the Wrong Oil?
Let's say you accidentally put 5W-30 in the 4-cylinder that calls for 0W-20. Is the engine going to explode? No, probably not. But it isn't ideal. The lower "0W" number means the oil is thinner at startup, which helps it reach the top of the engine faster on cold mornings. Using a thicker oil can slightly decrease your fuel economy and put a tiny bit more strain on the oil pump.
If you realize you've used the wrong 2018 acadia oil type, don't panic. Just change it out for the correct stuff at your next interval. However, if you used an oil that isn't dexos approved, I'd probably swap it out sooner rather than later just to be safe.
High Mileage Considerations
Since the 2018 models have been on the road for several years now, many Acadias are starting to climb up in mileage. If you've crossed that 75,000 or 100,000-mile threshold, you might see "High Mileage" versions of your favorite oil.
These are actually pretty good for the Acadia. They contain extra seal conditioners that help prevent the gaskets from getting brittle and leaking. If your driveway is currently clean and you aren't smelling any oil leaks, you don't have to switch, but it certainly doesn't hurt as the vehicle ages.
Wrapping It Up
At the end of the day, keeping your 2018 GMC Acadia happy comes down to consistency. Whether you choose Mobil 1, Valvoline, Pennzoil, or the house brand, as long as it has that dexos1 logo and the right viscosity (0W-20 for the 4-cyl, 5W-30 for the V6), your engine is going to be just fine.
Regular oil changes are hands down the cheapest maintenance you can do. It's way better to spend sixty bucks on a good DIY oil change today than thousands on a top-end engine rebuild three years from now. Take care of the oil, and the Acadia will take care of you.