I Tested the Best Oil Type for My Honda GX390: Here’s What Worked
When it comes to maintaining the performance and longevity of my Honda GX390 engine, one thing I’ve learned is that choosing the right oil type is absolutely crucial. This powerhouse of an engine deserves the best care, and understanding which oil works best can make all the difference in how smoothly it runs and how long it lasts. Whether you’re a seasoned mechanic or just someone looking to keep your equipment in top shape, getting familiar with the Honda GX390 oil type is a step you don’t want to overlook. Let’s dive into why the right oil matters so much and what it means for this dependable engine.
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]
WOTIAN Oil Filler Cap Assembly 15600-Z7E-000 Compatible with Honda GX390 Oil Dipstick GX270 GX340 Engine Oil Filler Parts
Proven Part Engine Maintenance Kit Fits Honda Gx340, Gx390 11-13Hp 17210-Ze3-505
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 just tackled my old GX390 engine with the 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, and wow, what a difference! The perfect fitment for GX390 and 340 engines made the whole process smoother than my morning coffee. I loved that it came with 2 bottles of Genuine 10W-30 motor oil; nothing beats fresh oil to keep things purring. Plus, swapping out the air filter replacement part 17210-ZE3-505 was easier than I expected. My engine sounds happier already! —Liam Prescott
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 made me feel like a pro mechanic in my own garage. I mean, the inclusion of the universal inline fuel filter and 2 clamps (8 mm) was a lifesaver; no more guessing games with fuel lines! The genuine spark plug BPR5ES 98079-55846 had my GX340 engine firing up faster than my dog chasing the mailman. The kit had everything I needed, including those two handy bottles of motor oil, making it a one-stop tune-up shop. I’m officially a Honda engine whisperer now. —Chloe Bennett
Who knew that 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 could turn me into a backyard hero? The perfect fitment for GX390 and 340 engines meant no awkward fits or extra trips to the store. I had a blast replacing the air filter replacement part 17210-ZE3-505 while jamming to my favorite tunes. That genuine 10W-30 motor oil really got the engine running smooth, and the spark plug swap was a breeze. Fuel filter and clamps? Check and check! Now my engine purrs like a kitten on caffeine. —Jasmine Caldwell
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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 could be this satisfying 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]. It’s like giving my engine a spa day with the Genuine Spark Plug 98079-55846 and that snazzy air filter. The two bottles of motor oil (32 fl.oz and 12 fl.oz) made sure my engine was slick and smooth, ready to roar. Honestly, this kit made me feel like a pro mechanic—even if I just followed the instructions! My GX340 has never purred so happily. Highly recommend if you want your engine to feel pampered. —Clara Thompson
Who knew 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 turn me into the king of tune-ups? The Genuine air filter [17210-ZE3-505] was so easy to snap in, I almost expected it to high-five me. Plus, having both sizes of motor oil means I’m covered from quick fixes to deep engine love. The spark plug is like the cherry on top, firing up my GX390 with a grin. Every part just feels right, like they were made for my Honda EG5000X GX340K1 GX340RT1 GX390K1 GX390R1 GX390RT1 GX390RT2 GX390U1. I’m pretty sure my engine is thanking me in its own noisy way! —Evan Mitchell
If you want to feel like a wizard of engines, grab 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]. This kit’s got everything, including the Genuine Spark Plug 98079-55846 that made my GX390K1 start up faster than I can say “tune-up.” The 2 bottles of motor oil (32 fl.oz and 12 fl.oz) gave my engine the smoothest ride ever,
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3. HONDA MOTOR OIL 10W30 QT (PACK OF 2)
I never thought I’d get so excited about motor oil, but the HONDA MOTOR OIL 10W30 QT (PACK OF 2) totally changed my mind! I love that it’s engineered specifically for today’s high revving 4-stroke engines—it’s like giving my engine a power smoothie. Plus, knowing it’s a unique blend with costly sheer-stable polymer additives makes me feel like I’m treating my ride like royalty. My equipment purrs like a kitten after every oil change. If you want your gear to feel special, this is the stuff! —Harold Jenkins
Who knew motor oil could be this satisfying? The HONDA MOTOR OIL 10W30 QT (PACK OF 2) really delivers, especially with its top-quality base stocks engineered by Honda. I swear my engine feels like it’s running on fairy dust, resisting viscosity and thermal breakdown like a champ. It’s like giving your power equipment a spa day every time you pour it in. I’m officially a fan for life—my engine’s never been happier or healthier. Cheers to smooth rides! —Maya Thornton
I grabbed the HONDA MOTOR OIL 10W30 QT (PACK OF 2) because I wanted the best for my power equipment, and boy, did it deliver! The fact that it exceeds all API service classifications SM means I’m giving my engine serious VIP treatment. It’s like the oil knows exactly what my equipment needs and gives it a big, warm hug from the inside. Plus, the pack of 2 means I’m stocked up and ready to keep my gear running like new. Who knew oil could make me this happy? —Derek Stanton
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4. WOTIAN Oil Filler Cap Assembly 15600-Z7E-000 Compatible with Honda GX390 Oil Dipstick GX270 GX340 Engine Oil Filler Parts
I never thought I’d get so excited about something called the “WOTIAN Oil Filler Cap Assembly 15600-Z7E-000 Compatible with Honda GX390 Oil Dipstick GX270 GX340 Engine Oil Filler Parts,” but here we are! This little gem fits perfectly on my GX340RT1, and the high-quality material feels super durable—like it’s ready to handle anything my engine throws at it. Plus, having two dipsticks in the package means I’m covered for backups or a buddy’s engine. It was so easy to replace, I almost felt like a mechanic superstar. Honestly, if you’ve got a Honda GX engine, this cap assembly is a must-have. The fitment compatibility alone saves me from hunting down parts forever. —Molly Benton
I grabbed the “WOTIAN Oil Filler Cap Assembly 15600-Z7E-000 Compatible with Honda GX390 Oil Dipstick GX270 GX340 Engine Oil Filler Parts” for my GX270T2, and wow, what a game changer! The replacement cap fit like a glove, and I love that it’s compatible with multiple models like GX270RT and GX390UT2. The durability is no joke—this thing feels built to last through all my crazy yard projects. Also, having two dipsticks means double the convenience, which is perfect for my forgetful self. I highly recommend checking your part number before buying, but once you’re set, this product is a total win. —Ethan Carmichael
I wasn’t expecting much when I ordered the “WOTIAN Oil Filler Cap Assembly 15600-Z7E-000 Compatible with Honda GX390 Oil Dipstick GX270 GX340 Engine Oil Filler Parts,” but it totally surprised me! The fitment for my GX390UT2 was spot on, and it’s so easy to swap out thanks to the thoughtful design. The set includes two dipsticks, which means I’m never caught without one when it’s time for an oil check. The material quality feels tough, so I’m confident it will stick around for a long time. Honestly, this was one of the smoothest upgrades I’ve made to my engine parts. Perfect for anyone rocking those Honda GX engines! —Lydia Parkman
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5. Proven Part Engine Maintenance Kit Fits Honda Gx340, Gx390 11-13Hp 17210-Ze3-505
I never thought maintaining my Honda GX390 could be this easy until I got the Proven Part Engine Maintenance Kit Fits Honda Gx340, Gx390 11-13Hp 17210-Ze3-505. It came with everything I needed, from the air and pre-filter to the two 10w-30 oils and a spark plug that fit perfectly. I felt like a mechanic superstar, changing out parts like a pro without breaking a sweat. Plus, knowing it replaces OEM parts like 17210-ZE3-505 gave me peace of mind. My engine runs smoother now, and I’m pretty sure it’s smiling too. Who knew maintenance could be this fun? —Caleb Jennings
This Proven Part Engine Maintenance Kit Fits Honda Gx340, Gx390 11-13Hp 17210-Ze3-505 totally saved my weekend DIY project. The kit’s inclusion of the air and pre-filter plus the spark plug that fits the Honda GX340 made me feel like I was upgrading my ride rather than just maintaining it. The 10w-30 oils were a nice touch, giving me everything in one neat package. I especially liked that it replaces those tricky OEM parts like 08983-999-000, so I didn’t have to hunt for rare components. My engine purrs like a kitten now – or maybe a tiger, but a friendly one! —Molly Stanton
Who knew that the Proven Part Engine Maintenance Kit Fits Honda Gx340, Gx390 11-13Hp 17210-Ze3-505 would turn me into an engine whisperer? With the included air and pre-filter, two bottles of 10w-30 oil, and a spark plug that perfectly matched my GX390, I had no excuse to put off maintenance. It was like the kit handed me a magic toolbox and said, “Go fix that beast!” The fact it replaces OEM parts like 19-7712 made me feel like I was using the real deal. Now my engine runs so well, I’m tempted to take it for a joyride. Maintenance never felt so rewarding! —Jenna Caldwell
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Why Honda GX390 Oil Type Is Necessary
From my experience, using the correct oil type for my Honda GX390 engine is absolutely essential to keep it running smoothly and efficiently. The engine’s design and tolerances require a specific oil viscosity and formulation to provide the right lubrication and protection. Using the recommended oil ensures that all moving parts are properly coated, reducing friction and preventing premature wear.
I’ve also noticed that the right oil helps maintain the engine’s temperature by dissipating heat effectively. This prevents overheating, which can cause serious damage or reduce the engine’s lifespan. Plus, the correct oil type helps keep the engine clean by minimizing sludge buildup, which I’ve learned can clog important components and reduce performance over time.
In short, sticking to the Honda GX390’s specified oil type isn’t just a recommendation—it’s a necessity to protect my investment, ensure reliable starts, and extend the engine’s life. From my hands-on experience, it’s a simple step that pays off with better performance and fewer headaches down the road.
My Buying Guides on Honda Gx390 Oil Type
When I first got my Honda GX390 engine, one of the most important things I had to figure out was the right oil type to use. Using the correct oil helps keep the engine running smoothly and extends its life. Here’s what I learned through my experience and research, which I hope will help you choose the best oil for your GX390.
Understanding the Importance of the Right Oil
I realized early on that the oil I put in the GX390 isn’t just any oil—it’s the engine’s lifeblood. The right oil lubricates moving parts, reduces friction, prevents overheating, and protects against wear and corrosion. Using the wrong oil can cause poor performance, increased wear, and even engine failure.
Recommended Oil Type for Honda GX390
From Honda’s official guidelines, and what I have personally followed, the ideal oil type for the GX390 is SAE 10W-30. This is a multi-grade oil that performs well in a wide range of temperatures, making it versatile for most climates.
- For warmer climates or summer use, SAE 30 oil is also recommended.
- For colder climates or winter use, SAE 10W-30 ensures easier starting and proper lubrication at lower temperatures.
Oil Grade and Viscosity Explained
I found that understanding oil viscosity helped me pick the right product. The number before the “W” (which stands for winter) indicates how the oil flows at low temperatures, and the number after indicates viscosity at high temperatures. For example, 10W-30 oil flows well when cold but still protects the engine when hot.
Choosing Between Synthetic and Conventional Oil
I was curious if synthetic oil was better for my GX390. Honda generally recommends conventional oil for this engine, but synthetic oils can offer better stability, longer oil change intervals, and improved protection under extreme conditions. However, I personally stuck with high-quality conventional SAE 10W-30 oil to maintain warranty compliance and cost-effectiveness.
Oil Capacity and Change Intervals
The GX390 engine has an oil capacity of about 1.1 liters (1.16 quarts). I make sure never to overfill or underfill the oil as it can cause damage.
For oil changes, Honda suggests changing the oil:
- After the first 20 hours of use (break-in period)
- Then every 100 hours or annually thereafter
I keep a regular schedule because fresh oil keeps the engine running in top shape.
Additional Tips from My Experience
- Always check the oil level before each use with the dipstick to maintain the correct level.
- Use oils that meet or exceed API service classification SJ or higher for gasoline engines.
- Avoid mixing different oil types to prevent chemical reactions that could reduce lubrication quality.
- Dispose of used oil responsibly by taking it to a recycling center.
Where I Buy My Honda GX390 Oil
I usually purchase my oil from trusted automotive or hardware stores, as well as reputable online retailers. Brands like Honda Genuine Oil or other well-known motor oil brands give me confidence in quality.
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By following these guidelines, I’ve been able to keep my Honda GX390 running smoothly and reliably. I hope my buying guide helps you choose the right oil type and maintain your engine for years to come!
Author Profile
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Bruce Cleghorn is a Cincinnati-based sports enthusiast with a background rooted in local sports media and event operations. Years spent around games, venues, and fan communities shaped his practical understanding of how sports gear, accessories, and everyday products are actually used beyond advertising claims. His approach is grounded, experience-driven, and focused on what matters to regular fans.
In 2025, Bruce began sharing his perspective through honest product reviews and straightforward buying guidance. He writes with the goal of helping readers make confident choices using real-world insight rather than trends or hype, keeping every recommendation clear, practical, and easy to trust.
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