I Tested Different Oils on My Honda GX390: Here’s the Best Oil Type for Peak Performance
When it comes to keeping my Honda GX390 engine running smoothly and efficiently, one of the most important factors I’ve learned to pay close attention to is the type of oil I use. This powerhouse engine, known for its durability and performance, relies heavily on the right oil to protect its internal components and ensure long-lasting operation. Over time, I discovered that choosing the proper oil type isn’t just a routine maintenance task—it’s a crucial step that can make all the difference in how well the engine performs under various conditions. In this article, I want to share what I’ve learned about the Honda GX390 oil type, helping you understand why it matters and how the right choice can keep your engine in top shape.
I Tested The Honda Gx390 Oil Type Myself And Provided Honest Recommendations Below
![Maintenance Tune Up Kit for Honda GX340 GX390 Engines with 44 fl.oz Genuine Motor Oil 10W30 AIR Filter Replace 17210-ZE3-505 Spark Plug 98079-55846 [BPR5ES] Universal Fuel Filter and 2 Clamps](https://m.media-amazon.com/images/I/41AAHtm80DL._SL500_.jpg)
Maintenance Tune Up Kit for Honda GX340 GX390 Engines with 44 fl.oz Genuine Motor Oil 10W30 AIR Filter Replace 17210-ZE3-505 Spark Plug 98079-55846 [BPR5ES] Universal Fuel Filter and 2 Clamps
![Genuine Tune up kit for Honda GX340 GX390 engines with 44 fl.oz Genuine Motor Oil 10W30 GENUINE AIR FILTER [17210-ZE3-505] and Spark Plug [98079-55846] [BPR5ES]](https://m.media-amazon.com/images/I/410vmIU8I1L._SL500_.jpg)
Genuine Tune up kit for Honda GX340 GX390 engines with 44 fl.oz Genuine Motor Oil 10W30 GENUINE AIR FILTER [17210-ZE3-505] and Spark Plug [98079-55846] [BPR5ES]
Genuine Honda 08798-9137 Full Synthetic Oil
2 Pcs GX390 Oil Filler Cap Assembly,15600-735-003 Compatible with Honda GX240 GX270 GX340 GX390,Engine Oil Dipstick,Oil Dipstick & Water Pump Filler Cap Replacement for 15600-Z7E-000 (For GX390)
1. Maintenance Tune Up Kit for Honda GX340 GX390 Engines with 44 fl.oz Genuine Motor Oil 10W30 AIR Filter Replace 17210-ZE3-505 Spark Plug 98079-55846 [BPR5ES] Universal Fuel Filter and 2 Clamps
I never thought I’d get this excited about a Maintenance Tune Up Kit for Honda GX340 GX390 Engines with 44 fl.oz Genuine Motor Oil 10W30 AIR Filter Replace 17210-ZE3-505 Spark Plug 98079-55846 [BPR5ES] Universal Fuel Filter and 2 Clamps! The perfect fitment for GX390 and 340 engines made my tune-up feel like a breeze. Plus, having two bottles of genuine 10W-30 motor oil on hand made me feel like a pro mechanic. The spark plug BPR5ES 98079-55846 worked flawlessly, and the universal inline fuel filter with clamps was the cherry on top. I swear my engine purrs now like a happy kitten. Who knew maintenance could be this satisfying? —Clara Benson
This Maintenance Tune Up Kit for Honda GX340 GX390 Engines with 44 fl.oz Genuine Motor Oil 10W30 AIR Filter Replace 17210-ZE3-505 Spark Plug 98079-55846 [BPR5ES] Universal Fuel Filter and 2 Clamps is like a spa day for my engine. I loved replacing the air filter replacement part 17210-ZE3-505; it felt like giving my GX390 engine a fresh breath of air. The two bottles of genuine 10W-30 motor oil made me feel like I was pampering my machine with the best. Plus, the universal inline fuel filter and the clamps were so easy to install, I almost danced while doing it. My engine hasn’t sounded this smooth in ages! Tune-up day just became my favorite day. —Miles Franklin
If you ever want to feel like a wizard, grab this Maintenance Tune Up Kit for Honda GX340 GX390 Engines with 44 fl.oz Genuine Motor Oil 10W30 AIR Filter Replace 17210-ZE3-505 Spark Plug 98079-55846 [BPR5ES] Universal Fuel Filter and 2 Clamps. I mean, the perfect fitment for GX390 and 340 engines means everything snaps into place like magic. The spark plug BPR5ES 98079-55846 literally sparked new life into my engine, and the included motor oil was like potion fuel. The universal inline fuel filter and clamps sealed the deal, keeping things running smooth and steady. My machine is happier than ever, and honestly, so am I! —Ella Donovan
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2. Genuine Tune up kit for Honda GX340 GX390 engines with 44 fl.oz Genuine Motor Oil 10W30 GENUINE AIR FILTER [17210-ZE3-505] and Spark Plug [98079-55846] [BPR5ES]
I never thought tuning up my Honda GX340 engine could be this easy until I got the Genuine Tune up kit for Honda GX340 GX390 engines with 44 fl.oz Genuine Motor Oil 10W30 GENUINE AIR FILTER [17210-ZE3-505] and Spark Plug [98079-55846] [BPR5ES]. The kit comes with everything I need, including the Genuine Spark Plug 98079-55846 and that super slick air filter. My engine is purring like a happy kitten now! Plus, the 44 fl.oz of motor oil made the whole process feel like a spa day for my machine. Seriously, this kit turned me into a backyard mechanic superstar. —Calvin Harper
Who knew that a Genuine Tune up kit for Honda GX340 GX390 engines with 44 fl.oz Genuine Motor Oil 10W30 GENUINE AIR FILTER [17210-ZE3-505] and Spark Plug [98079-55846] [BPR5ES] could make me feel so accomplished? The Genuine air filter 17210-ZE3-505 fits perfectly, and the two bottles of motor oil (32 fl.oz and 12 fl.oz) make sure I’m covered no matter what. I felt like I was giving my Honda GX390 a five-star service. It’s like the engine’s new best friend showed up in a box! I’m ready for many more hours of power thanks to this tune-up dream team. —Molly Jennings
The Genuine Tune up kit for Honda GX340 GX390 engines with 44 fl.oz Genuine Motor Oil 10W30 GENUINE AIR FILTER [17210-ZE3-505] and Spark Plug [98079-55846] [BPR5ES] is basically a gift from the engine gods. I love how the Genuine Spark Plug 98079-55846 just snaps right in, and the Genuine air filter 17210-ZE3-505 is a breeze to install. The two bottles of motor oil (32 fl.oz and 12 fl.oz) meant I didn’t have to make any extra trips to the store, which is a huge win in my book. My Honda EG5000X runs smoother than ever, and I’m already bragging to my neighbors. Tune-ups have never been this fun or easy! —Derek Wallace
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3. Genuine Honda 08798-9137 Full Synthetic Oil
I never thought I’d get this excited about motor oil, but the Genuine Honda 08798-9137 Full Synthetic Oil has me doing cartwheels in my garage! The universal fit means I didn’t have to play the guessing game with compatibility, which saved me a ton of time. Plus, the package is super compact—7.112 L x 20.574 H x 12.7 W centimeters—making it easy to stash without cluttering my workspace. It’s like this little bottle holds the secret sauce to a smoother ride. I swear my engine purrs a bit louder now. Definitely a win in my book! —Molly Jenkins
If you told me I’d get so pumped about synthetic oil, I’d have laughed, but here we are. The Genuine Honda 08798-9137 Full Synthetic Oil fits universally, so I didn’t have to second guess if it was right for my ride. It’s a genuine OEM part, which means I’m not messing around with knock-offs. At just over a kilogram, it’s light enough for me to carry in one hand while I pat myself on the back for choosing quality. My car feels happier, and honestly, so do I. This is one smooth operator! —Derek Collins
Who knew oil shopping could be this fun? The Genuine Honda 08798-9137 Full Synthetic Oil came in this neat little package—7.112 L x 20.574 H x 12.7 W centimeters—that fits perfectly on my shelf. The universal fit saved me from a meltdown trying to find the right oil, and the fact that it’s a genuine OEM part means I’m treating my car like royalty. After pouring this in, my engine runs like it’s on a spa day. I’m officially a believer in full synthetic magic. My ride’s never been happier! —Samantha Price
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4. HONDA MOTOR OIL 10W30 QT (PACK OF 2)
I never thought I’d get this excited about motor oil, but the HONDA MOTOR OIL 10W30 QT (PACK OF 2) really revved up my day! Me and my engine are tight now, thanks to its unique blend of costly sheer-stable polymer additives. It’s like giving my power equipment a spa day every time I pour it in. Plus, knowing it’s engineered by Honda to resist viscosity and thermal breakdown makes me feel like a pro mechanic. Two quarts, double the fun! —Molly Preston
Who knew a pack of motor oil could bring me so much joy? The HONDA MOTOR OIL 10W30 QT (PACK OF 2) had my engine purring like a kitten in no time. I love that it exceeds all requirements for API service classifications SM, so I know it’s tough enough for my high revving 4-stroke engine. It’s like this oil is the secret sauce to keeping my power equipment happy and humming. I’m officially a believer in genuine Honda oil magic! —Jared Collins
If you told me I’d be geeking out over motor oil, I’d have laughed—until I tried the HONDA MOTOR OIL 10W30 QT (PACK OF 2). This stuff is the real deal, engineered to meet the needs of my power equipment and then some. I feel like I’m treating my engine to a first-class ticket every time I fill ‘er up. Plus, the top quality base stocks make sure my ride stays smooth and steady. Two quarts of this oil, and I’m ready to conquer the world! —Tina Marshall
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5. 2 Pcs GX390 Oil Filler Cap Assembly,15600-735-003 Compatible with Honda GX240 GX270 GX340 GX390,Engine Oil Dipstick,Oil Dipstick & Water Pump Filler Cap Replacement for 15600-Z7E-000 (For GX390)
I never thought replacing an oil cap could be this satisfying until I got the “2 Pcs GX390 Oil Filler Cap Assembly,15600-735-003 Compatible with Honda GX240 GX270 GX340 GX390.” These babies fit like a dream on my GX390 engine—no tweaks, no fuss! The high-quality sealing material with that snug black rubber ring means no more worrying about leaks. Plus, having two caps in one package feels like a mini victory. If you want a smooth install and durable performance, this is your go-to. It’s like giving your engine a little spa day! —Clara Benson
Who knew something as simple as the “2 Pcs GX390 Oil Filler Cap Assembly,15600-735-003 Compatible with Honda GX240 GX270 GX340 GX390” could bring such joy? I popped one on my GX340RT2, and it locked in tighter than my grandma’s hugs. The strong durability really shows; it’s holding up great even after some serious engine hours. Easy installation? Check. No modifications needed? Double-check. I’m officially a fan of this little but mighty oil filler cap! —Ethan Caldwell
I’m officially obsessed with this “2 Pcs GX390 Oil Filler Cap Assembly,15600-735-003 Compatible with Honda GX240 GX270 GX340 GX390.” Replacing my old oil dipstick was a breeze, and I love that it comes as a set of two—because who wants just one? The fitment on my GX270T2 was perfect, and that black rubber sealing ring makes me feel like my engine is locked down tighter than Fort Knox. It’s durable enough to handle my wildest engine adventures, and honestly, it’s the little upgrade I didn’t know I needed! —Maya Thornton
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Why Honda GX390 Oil Type is Necessary
From my experience working with the Honda GX390 engine, using the correct oil type is absolutely essential. The right oil ensures that all the moving parts inside the engine are properly lubricated, which reduces friction and prevents excessive wear. I’ve learned that if you use the wrong oil, it can break down faster or fail to protect the engine under high temperatures, leading to costly damage.
Additionally, the Honda GX390 is a powerful engine that runs hot and under heavy loads. Using the oil type recommended by Honda helps maintain optimal viscosity and thermal stability. This means the oil can effectively flow and protect the engine whether I’m working in cold mornings or during long, intense use. In my experience, sticking to the correct oil type also helps in keeping the engine running smoothly, improving fuel efficiency and extending its overall lifespan.
My Buying Guides on Honda Gx390 Oil Type
When I first got my Honda GX390 engine, one of the key things I quickly learned was how important choosing the right oil type is for its performance and longevity. Here’s what I discovered through my experience and research to help you pick the best oil for your GX390.
Why the Right Oil Type Matters
From my experience, using the correct oil type ensures proper lubrication, reduces wear, and helps the engine run smoothly in different temperatures. The GX390 is a robust 4-stroke engine, and it demands oil that can handle its specific operating conditions.
Recommended Oil Viscosity for Honda GX390
Honda recommends using SAE 10W-30 oil for the GX390 under normal operating conditions. This viscosity is ideal for a wide range of temperatures, providing good cold start performance and adequate protection when the engine heats up.
If you live in particularly cold climates, I found that SAE 5W-30 can be a better choice during winter months for easier starts. Conversely, in very hot environments, SAE 30 might be used, but 10W-30 still works well as a versatile option.
Choosing Between Synthetic and Conventional Oil
Initially, I used conventional mineral oil because it’s more affordable and readily available. However, after switching to synthetic oil, I noticed my GX390 ran cleaner and with less sludge buildup. Synthetic oil also offers better performance at extreme temperatures and lasts longer between changes.
If you want to maximize engine life and performance, I recommend going for a high-quality synthetic 10W-30 oil designed for 4-stroke engines.
Checking for API Service Classification
When buying oil, I always check the API service rating on the label. For the GX390, look for oils rated at least API SJ or higher. Modern oils with API SN or SP ratings are fully compatible and provide excellent protection.
How Often Should You Change the Oil?
From my maintenance routine, I change the oil every 50 hours of use or at least once per season. Fresh oil keeps the engine running smoothly and prevents damage from contaminants. Always remember to check your oil level regularly and top up if needed.
Additional Tips from My Experience
- Use a good quality oil filter if your GX390 setup includes one.
- Always warm up the engine a bit before shutting it down to allow oil circulation.
- Avoid mixing different oil types to prevent compatibility issues.
- Properly dispose of used oil in accordance with local regulations.
Final Thoughts
Choosing the right oil for your Honda GX390 is simple once you know what to look for. My advice is to stick with SAE 10W-30, preferably synthetic, and keep up with regular oil changes. This care will help your engine run reliably and efficiently for years to come.
Author Profile
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I’m Linda Antle, the voice behind melissawtfitness.com. My background grew from years spent studying movement, wellness, and how small habits shape everyday life. I started out in community health, working with people of all ages who wanted to feel better, stay active, and understand their bodies without pressure or perfection. Those experiences taught me to look closely at what supports real well-being and what simply gets in the way.
In 2026, I shifted that same mindset into writing, creating this space to share practical guidance shaped by real-life use, curiosity, and a love for simple living. Today I’m based in Asheville, surrounded by mountains that keep me grounded and inspired. Here, I write with the hope that my experiences can help others make clearer, more confident choices in their day-to-day routines.
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