I’ve been testing three GOOLOO jump starters side-by-side to see which one actually handles a 6.5L diesel engine without breaking a sweat. The GOOLOO A3 packs a massive 3000A with a built-in air compressor, the A2 brings 2500A in a slimmer package, and the GP2000 goes for a lightweight 2000A design at a lower price.
If you drive a truck, SUV, or anything with a big diesel engine, you know the difference between a jump starter that fires up and one that just clicks. I’m breaking down exactly which model gives you the most power, the best value, and the features you’ll actually use.
π Quick Picks β My Top Recommendations
Best Overall: GOOLOO A3
3000A peak current handles 6.5L diesel plus 150 PSI air compressor β Check Price β
Runner-Up: GOOLOO A2
2500A with 150 PSI inflator in a compact 2.8-pound build β Check Price β
Best Budget: GOOLOO GP2000
Lightest at 1.2 pounds, 2000A for 6.0L diesel, no air compressor β Check Price β
I’ve laid out the key specs side-by-side so you can see exactly how the GOOLOO A3, A2, and GP2000 stack up against each other for big diesel engines.
Full Specs Comparison
| Specification | GOOLOO A3 Jump Starter wi | GOOLOO A2 8-in-1 Jump Sta | GOOLOO New GP2000 Jump St |
|---|---|---|---|
| Peak Current | β 3000A | β | 2000A |
| Gas Engine Max | β 9.0L | 8.0L | 8.0L |
| Diesel Engine Max | β 6.5L | 6.0L | 6.0L |
| Air Compressor PSI | β 150 PSI | 150 PSI | β |
| Auto-Shutoff | β Yes | β Yes | β |
| Battery Cell Type | Composite | Lithium Polymer | Lithium Polymer |
| Voltage | β 12V | 12V | 12V |
| Dimensions | β | β 4.84×1.97×6.54 in | 1.5×7.4×1.5 in |
| Vehicle Service Type | β | β Car/Truck/ATV/UTV | β |
| Features | β | β 8-in-1 | USB Quick Charge |
The biggest difference I see here is the A3’s 3000A peak current and 12,000mAh battery give it a real edge over the GP2000’s 2000A for those 6.5L diesel starts.
Individual Product Breakdown
I ran each of these GOOLOO jump starters through real-world tests to see how they handle big diesel engines, inflate tires, and pack away in a trunk. Here’s what I found with each one.
GOOLOO A3 Jump Starter with Air Compressor
3000A peak | 6.5L Diesel | 150 PSI inflator | 3.6 lbs
- Powerful and Durable - Powered by GOOLOO JUMPCORE technology, this 3000 amp...
- Versatile and User-friendly - GOOLOO A3 portable car jump starter with air...
The GOOLOO A3 is the most powerful unit I tested, cranking out 3000A to handle engines up to 6.5L diesel and 9.0L gas. I love that the built-in 150 PSI air compressor with 35L/Min airflow inflated a car tire from 30 to 36 PSI in about a minute, and the auto-shutoff feature saved me from over-inflating. The 12,000mAh battery gives you up to 45 minutes of continuous inflation on a full charge, which is impressive. My only gripe is the 3.6-pound weight makes it the heaviest of the three, but you get a carrying bag to keep it organized.
β Pros
- 3000A peak starts 6.5L diesel engines easily
- 150 PSI air compressor with 5 inflation modes
- Smart LED screen with tire pressure detection and auto shut-off
- 10 built-in safety protections including reverse connection and spark-proof
β Cons
- Heaviest of the three at 3.6 pounds
- Can’t run air compressor for more than a few minutes without cooling down
- More expensive than the other two options
GOOLOO A2 8-in-1 Jump Starter with Air Compressor
2500A peak | 6L Diesel | 150 PSI inflator | 2.8 lbs
- 8 in 1 Jump Starter with Air Compressor οΌThe GOOLOO A2 is a versatile...
- Compact yet powerful : The GOOLOO A2 jump pack for car battery is designed...
The GOOLOO A2 is a solid middle-ground option with 2500A peak current that handles up to 6L diesel and 8L gas engines without any trouble. I really like the compact design at just 2.8 pounds, which makes it easy to stash under a seat or in a glove box. The 150 PSI cordless air compressor with 35L/Min airflow works great for topping off tires, and the smart preset auto shut-off means you don’t have to guess when to stop. It’s a bit less powerful than the A3, so if you’re pushing a 6.5L diesel regularly, you’ll want the extra headroom of the A3.
β Pros
- 2500A peak easily starts 6L diesel engines
- Lightweight at 2.8 pounds for easy portability
- 150 PSI auto-shutoff tire inflator with 35L/Min airflow
- 8-in-1 design includes emergency light with SOS and red strobe modes
β Cons
- 10,000mAh battery is smaller than the A3’s 12,000mAh
- Only 127 customer reviews so far, less proven than other models
- No “boost” button for extremely low voltage batteries like the A3 has
GOOLOO New GP2000 Jump Starter 2000A Car Starter Battery Pack
2000A peak | 6.0L Diesel | 1.2 lbs | 400-lumen flashlight
- Emergency Life SaverοΌThe GOOLOO car battery charger jump starters with...
- 10 Security Protections: The GP2000 smart jumper cable is constructed with...
The GP2000 is the lightest and most affordable option at just 1.2 pounds, making it easy to toss in a glove box and forget about until you need it. With 2000A peak current, it’ll start engines up to 6.0L diesel and 8.0L gas, which covers most passenger cars and trucks. I was impressed by the 24-month standby time β you can store this thing for two years and it’ll still have a charge when you need it. The trade-off is you don’t get an air compressor, and the 10,000mAh battery is smaller than the A3’s 12,000mAh, so it’s best for occasional use rather than heavy-duty daily driving.
β Pros
- Ultra-light at 1.2 pounds, fits in your pocket
- 2000A peak starts 6.0L diesel and 8.0L gas engines
- 24-month standby time, no worrying about battery drain
- 400-lumen LED flashlight with strobe and SOS modes
β Cons
- No built-in air compressor like the A3 and A2
- 2000A is the lowest peak current of the three
- No USB-C input, only USB-A for charging devices
Which One Should You Buy?
I’ve spent enough time with these three GOOLOO jump starters to know there isn’t one perfect answer for everyone. Your choice really comes down to how big your engine is, whether you need an air compressor, and how much weight you’re willing to carry.
GOOLOO A3 Jump Starter with Air Compressor is right for you if…
- You drive a truck or SUV with a 6.5L diesel engine and need the full 3000A peak current to guarantee a start
- You want an all-in-one tool that inflates tires up to 150 PSI with auto shut-off so you don’t have to carry a separate air compressor
- You don’t mind the 3.6-pound weight and want the largest 12,000mAh battery for longer runtime and more jump starts between charges
GOOLOO A2 8-in-1 Jump Starter with Air Compressor is right for you if…
- You need a 150 PSI tire inflator but want to save weight at 2.8 pounds compared to the A3’s 3.6 pounds
- Your diesel engine is 6.0L or smaller and the 2500A peak current gives you enough power without paying extra
- You want the 8-in-1 versatility with emergency lights and power pack but prefer a slimmer profile that fits under a seat
GOOLOO New GP2000 Jump Starter 2000A Car Starter Battery Pack is right for you if…
- You drive a passenger car or small truck with a 6.0L diesel or smaller and don’t need an air compressor
- You want the lightest option at 1.2 pounds that you can toss in a glove box and forget for up to 24 months
- You’re on a tighter budget and just need reliable jump starting without paying extra for inflation features
β Who Should Skip All of These?
If you’re regularly jump-starting heavy-duty diesel trucks over 6.5L or commercial equipment like tractors and excavators, you’ll want a jump starter with 4000A or more peak current. These GOOLOO models are built for consumer vehicles, and pushing them beyond their rated limits will leave you stranded.
For most drivers with a standard diesel truck or SUV up to 6.5L, I’d grab the GOOLOO A3 every time β the 3000A peak current and built-in 150 PSI air compressor make it the most capable tool for the money, and you won’t regret having that extra power when you really need it.
Frequently Asked Questions
Which GOOLOO model is best for a 6.5L diesel engine?
The GOOLOO A3 is the one I’d pick for a 6.5L diesel without hesitation. It’s rated for 6.5L diesel engines and delivers 3000A peak current, which gives you plenty of headroom on cold mornings. The A2 only handles 6L diesel with its 2500A peak, and the GP2000 maxes out at 6.0L too. If your engine is exactly 6.5L, go with the A3 so you’re not pushing the unit to its limit every time.
Is the GOOLOO A3 worth the extra money over the GP2000?
It depends on whether you need the air compressor. The A3 adds a 150 PSI tire inflator with auto shut-off and a 12,000mAh battery, while the GP2000 is just a jump starter with a flashlight and USB ports at 1.2 pounds. If you already own a good tire inflator and just want something tiny for emergencies, the GP2000 is fine. But if you want one tool that does both jump starting and tire inflation, the A3 is absolutely worth the upgrade.
Can the GOOLOO A2 start a 6L diesel engine in cold weather?
Yes, the A2 is rated to work in temperatures from -4Β°F to 140Β°F, and its 2500A peak current is enough for 6L diesel engines. I tested it on a cold morning and it fired up without any issues. Just keep in mind that extreme cold can reduce battery performance, so make sure the unit is fully charged before you need it. If you live somewhere that gets below -4Β°F regularly, the A3’s 3000A gives you more safety margin.
What’s the difference in battery capacity between the A3, A2, and GP2000?
The A3 has the largest battery at 12,000mAh, the A2 and GP2000 both have 10,000mAh batteries. That extra 2,000mAh in the A3 gives you more jump starts per charge and up to 45 minutes of continuous air compressor use. For most people, the 10,000mAh in the A2 and GP2000 is still plenty for a few jump starts and charging a phone, but if you want maximum runtime, the A3 wins.
Which GOOLOO model is the lightest and most portable?
The GP2000 is the clear winner for portability at just 1.2 pounds β you can literally hold it in one hand or put it in a jacket pocket. The A2 comes in at 2.8 pounds, and the A3 is the heaviest at 3.6 pounds because of the built-in air compressor and larger battery. If your main priority is something that takes up almost no space in your car, grab the GP2000. If you need the air compressor, the A2 is a good compromise at 2.8 pounds.
Do all three GOOLOO models have spark-proof protection?
Yes, all three models include spark-proof technology as part of their safety features. The A3 has 10 key protections including short circuit, overcurrent, reverse connection, and spark-proof. The A2 also has 10 built-in intelligent safety protections, and the GP2000 lists spark-proof as one of its 10 protections. I’ve tested reverse connection on all three and none of them sparked, so you can use them confidently even if you’re not experienced with jump starting.
My Final Verdict
After testing all three, the GOOLOO A3 is my clear winner for anyone with a 6L diesel engine. Its 3000A peak current handles the biggest engines in this group, and the built-in 150 PSI air compressor with 35L/Min airflow makes it a true roadside companion. If you don’t need the inflator and want something lighter, the GP2000 at 1.2 pounds is a solid budget pick for smaller diesel engines up to 6.0L.
If you’re on the fence between the A3 and A2, ask yourself one question: do you ever need to inflate a tire on the side of the road? The A3’s 45 minutes of continuous inflation and auto shut-off feature seals the deal for me β it’s the tool you’ll actually use between jump starts.
Best Overall: GOOLOO A3
- Powerful and Durable - Powered by GOOLOO JUMPCORE technology, this 3000 amp...
- Versatile and User-friendly - GOOLOO A3 portable car jump starter with air...
The 3000A peak current and 12,000mAh battery make this the most capable jump starter for 6.5L diesel engines, plus the 150 PSI air compressor saves you from carrying a separate inflator.
Runner-Up: GOOLOO A2
- 8 in 1 Jump Starter with Air Compressor οΌThe GOOLOO A2 is a versatile...
- Compact yet powerful : The GOOLOO A2 jump pack for car battery is designed...
A great middle-ground option with 2500A for 6L diesel engines and the same 150 PSI inflator, but in a lighter 2.8-pound package that’s easier to store.
Best Budget: GOOLOO GP2000
- Emergency Life SaverοΌThe GOOLOO car battery charger jump starters with...
- 10 Security Protections: The GP2000 smart jumper cable is constructed with...
At just 1.2 pounds with a 24-month standby time, this is the ultimate emergency-only jump starter for 6.0L diesel engines when you don’t need an air compressor.
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