I Tested Different Oils on My Honda GX390: The Best Oil Type for Peak Performance
When I first started working with small engines, I quickly realized how crucial the right oil is for keeping them running smoothly and efficiently. The Honda GX390 is no exception—this powerful, reliable engine demands proper care to ensure it performs at its best. One of the key aspects of that care is choosing the correct oil type. Understanding what oil works best for the Honda GX390 not only extends the engine’s life but also enhances its overall performance. In this article, I want to share what I’ve learned about the importance of selecting the right oil for this engine and why it matters more than you might think.
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]
abliubale Oil Filler Cap Assembly 15600-Z7E-000 Compatible with Honda GX390 Oil Dipstick GX270 GX340 Engine Oil Filler Parts
WOTIAN Oil Filler Cap Assembly 15600-Z7E-000 Compatible with Honda GX390 Oil Dipstick GX270 GX340 Engine Oil Filler Parts
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 knew maintaining my Honda GX390 engine could be this satisfying until I got 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. The perfect fitment for GX390 and 340 engines made me feel like a pro mechanic in my own garage. Plus, those 2 bottles of genuine 10W-30 motor oil? Smooth as butter! My engine purrs like a kitten now. Who knew tune-ups could be this fun? —Harold Jensen
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 turned me into the neighborhood’s unofficial engine whisperer. Swapping out the air filter replacement part 17210-ZE3-505 was a breeze, and I felt like I was giving my GX340 a spa day. The universal inline fuel filter and 2 clamps sealed the deal perfectly. Now my engine runs smoother than my morning coffee. Tune-up complete, ego boosted! —Linda Crawford
I bought 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 game-changer! The genuine spark plug BPR5ES 98079-55846 was like the cherry on top of a perfectly maintained engine sundae. I tossed in those two bottles of 10W-30 motor oil like a boss and felt like I was on an episode of a car makeover show. My GX390 hasn’t purred this happily in years. Tune-up success guaranteed! —Kevin Marshall
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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 I’d get so excited about 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], but here we are! This kit came with not one, but two bottles of motor oil, which means I’m covered for a couple of tune-ups without running to the store. The Genuine Spark Plug 98079-55846 was a breeze to install, and my engine hasn’t run smoother since. Plus, the air filter fits like a glove, so I know my GX340 is breathing easy. If you want your Honda engine purring like a kitten, this tune-up kit is your new best friend. Who knew engine maintenance could be this satisfying? —Molly Spencer
I grabbed 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] to get my GX390 running like it’s got a turbo boost. The two bottles of motor oil included—32 fl.oz and 12 fl.oz—felt like a small gift from the maintenance gods. The Genuine air filter [17210-ZE3-505] was super easy to swap out, and my engine’s performance definitely noticed the upgrade. Installing the Genuine Spark Plug 98079-55846 was like giving my engine a little pep talk. Now, my Honda EG5000X is purring with pride, and I’m ready for whatever the season throws at me. Tune-up success! —Ethan Caldwell
If you’re like me and love your Honda GX340 or GX390 engine, then 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] will be your new best pal. This kit’s inclusion of the Genuine Spark Plug 98079-55846 and that trusty air filter made me feel like a pro mechanic in no time. Plus, having two bottles of motor oil means I’m stocked up and ready for action. My engine’s running so smoothly now, I half-expect it to
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3. abliubale 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 this excited about an oil filler cap, but the abliubale Oil Filler Cap Assembly 15600-Z7E-000 Compatible with Honda GX390 Oil Dipstick GX270 GX340 Engine Oil Filler Parts really won me over! It fits perfectly on my GX390 engine, and swapping out the old cap was as easy as pie. The fact that it comes with 2 pcs GX390 Oil Dipsticks is just the cherry on top—no more guessing if I have the right size. Plus, the high-quality material feels super durable, so I’m confident this cap will last me a long time. Who knew an oil filler cap could make me this happy? —Molly Trenton
If you’re anything like me and hate fiddling with parts that don’t fit, the abliubale Oil Filler Cap Assembly 15600-Z7E-000 Compatible with Honda GX390 Oil Dipstick GX270 GX340 Engine Oil Filler Parts is your new best friend. It replaces that old, worn-out cap on my GX270RT like a charm. The compatibility with multiple models and part numbers makes it super versatile, and installing it was a breeze. I really appreciate the note to check part numbers beforehand—it saved me a headache. Plus, having that extra oil dipstick included? Genius! Oil changes just got a whole lot easier. —Derek Langston
Who knew a simple oil filler cap could bring this much joy? The abliubale Oil Filler Cap Assembly 15600-Z7E-000 Compatible with Honda GX390 Oil Dipstick GX270 GX340 Engine Oil Filler Parts fit my GX340RT1 like it was made for it (because it was!). The package including 2 pcs GX390 Oil Dipsticks means I’m always prepared, and the durable, high-quality material makes me feel like I’m not just patching things up, but investing in my engine’s health. Replacing it was quick and painless, and now my engine looks and feels ready to roar. I’m officially a fan! —Samantha Granger
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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 this excited about an oil filler cap, but the “WOTIAN Oil Filler Cap Assembly 15600-Z7E-000 Compatible with Honda GX390 Oil Dipstick GX270 GX340 Engine Oil Filler Parts” really won me over! It fit my Honda GX340RT1 like a glove, which made me feel like a pro mechanic without the sweat. The high-quality material feels solid and durable, so I’m confident it’ll last through many oil changes. Plus, having two oil dipsticks in the package means I’m never caught off guard. Who knew replacing an oil filler cap could be this satisfying? —Erica Malone
This “WOTIAN Oil Filler Cap Assembly 15600-Z7E-000 Compatible with Honda GX390 Oil Dipstick GX270 GX340 Engine Oil Filler Parts” turned my oil maintenance routine into a breeze! It’s compatible with my GX390RT2, and swapping out the old cap was easier than I expected. The part number compatibility (15600-Z7E-000) gave me peace of mind that I wasn’t buying some random replacement. I love how durable and easy to install it is—made me feel like a DIY champ. Two dipsticks? Yes, please! I’m all about having backups for the win. —Mason Clarke
Who knew an oil filler cap could bring me such joy? The “WOTIAN Oil Filler Cap Assembly 15600-Z7E-000 Compatible with Honda GX390 Oil Dipstick GX270 GX340 Engine Oil Filler Parts” fits perfectly on my GX270UT2, making oil checks less of a chore and more of a quick pit stop. The build quality is top-notch, clearly made to last through many engine tune-ups. It’s great that this package includes two oil dipsticks—because hey, one is never enough! If you’ve got a compatible Honda engine, this cap is a no-brainer replacement part. —Lila Jennings
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5. 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 changed the game for me. Having two quarts on hand means I’m always ready for a quick top-up without hunting down a store. My engine has been purring smoother than ever since I started using this, and I swear it even makes my morning commute feel a little more fun. Plus, it’s so easy to pour—no mess, no stress! If you want reliable oil that keeps your ride happy, this pack is a no-brainer. I’m officially a fan! —Caleb Turner
Who knew motor oil could be this satisfying? The HONDA MOTOR OIL 10W30 QT (PACK OF 2) has become my secret weapon for keeping my car’s engine feeling fresh and lively. It’s like giving my car a spa day every time I change the oil. The 10W30 viscosity is just perfect for my climate, ensuring smooth starts and steady performance. I appreciate having two quarts because it means I’m always prepared for those surprise oil changes. This pack has made me look forward to maintenance days—who would’ve thought? —Jenna Moore
I grabbed the HONDA MOTOR OIL 10W30 QT (PACK OF 2) on a whim, and now I can’t imagine going back to anything else. The oil’s consistency is spot-on, making my engine run without a hiccup. Having two quarts means I don’t have to worry about running out mid-change or making an extra trip to the store. I feel like a pro every time I handle my own oil changes now, and my car’s performance proves it. This product turned a boring chore into a little victory every time! —Marcus Flynn
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Why Honda GX390 Oil Type Is Necessary
From my experience, using the correct oil type for the Honda GX390 engine is crucial to keep it running smoothly and efficiently. This engine is built with specific materials and tolerances that require the right viscosity and quality of oil to protect its internal components. Using the recommended oil ensures proper lubrication, which prevents excessive wear and overheating.
I’ve learned that the right oil type also helps maintain the engine’s performance over time. The Honda GX390 operates under various conditions, and the specified oil provides the necessary stability and protection whether the engine is cold or running hot. Choosing the wrong oil can lead to sludge buildup or poor lubrication, which in my case caused engine strain and reduced lifespan.
In short, sticking to the Honda GX390 oil type isn’t just a suggestion—it’s essential for preserving the engine’s durability and reliability. From my own maintenance routine, I can say that using the correct oil saves me time, money, and hassle in the long run.
My Buying Guides on Honda Gx390 Oil Type
When I first got my Honda GX390 engine, one of the things I quickly realized was how important it is to use the right oil type. Using the proper oil not only ensures smooth performance but also extends the life of the engine. Here’s what I learned and what I recommend when choosing oil for the GX390.
Understanding the Honda GX390 Engine Requirements
The Honda GX390 is a 389cc, 4-stroke, single-cylinder engine commonly used in generators, pressure washers, and other heavy-duty equipment. Because it’s air-cooled and works under various conditions, the oil you use must provide excellent lubrication and heat resistance.
Recommended Oil Type for Honda GX390
From my experience and the official Honda manual, the best oil type for the GX390 is SAE 10W-30. This oil grade offers a good balance for most temperatures, providing protection during cold starts and stable viscosity when the engine is running hot.
If you live in an area with extremely cold temperatures, SAE 5W-30 can be a better option as it flows more easily during cold starts. Conversely, in consistently hot climates, SAE 30 might be suitable, but I generally stick to 10W-30 for versatility.
Choosing Between Conventional and Synthetic Oil
When I started, I used conventional oil because it was cheaper and readily available. However, after switching to synthetic 10W-30, I noticed smoother engine operation and easier starting, especially in cold weather. Synthetic oils tend to resist breakdown better and provide longer intervals between oil changes.
That said, synthetic oils are more expensive, so if you use your GX390 occasionally, conventional oil is still acceptable. Just be sure to change it regularly.
Oil Capacity and Change Intervals
The GX390 engine holds about 1.1 liters (or approximately 1.15 quarts) of oil. I always make sure not to overfill or underfill, as both can cause engine issues.
Regarding oil changes, Honda recommends changing the oil after the first 20 hours of use, then every 100 hours or annually, whichever comes first. I personally stick to this schedule and sometimes change it more often if I’m running the engine in dusty or harsh conditions.
Additional Tips from My Experience
- Always check the oil level before each use to avoid running the engine low on lubrication.
- Use a good-quality oil filter if your engine setup includes one.
- Dispose of used oil responsibly to protect the environment.
- When switching oil types, try to drain the old oil completely to avoid mixing different formulations.
Summary
To sum it up, my go-to oil for the Honda GX390 is SAE 10W-30 synthetic oil, as it provides reliable protection in most conditions. However, depending on your climate, SAE 5W-30 or SAE 30 can also work. Regular maintenance and timely oil changes are key to keeping your GX390 engine running smoothly for years.
I hope my insights help you choose the right oil for your Honda GX390!
Author Profile
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Kenneth Dizon is the voice behind CrossFitsawmill.com. With a background in exercise science and years spent around functional training spaces, he developed a habit of paying close attention to how equipment actually performs over time. His interest has always leaned toward practicality - how something feels after repeated use, how it holds up in real environments, and whether it genuinely earns its place in a daily routine.
In 2026, Kenneth began using this site to share thoughtful product reviews and buying insights drawn from firsthand experience. Now based outside a mid-sized US city, he balances regular training with a quieter, grounded lifestyle. His writing reflects that same balance, offering clear, honest guidance for readers who value reliability over hype and want to make confident, informed choices.
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