I spend a lot of time under trucks and tractors, and wrestling with a manual grease gun is a pain. That’s why I was eager to test the BOSCH GFP18V-10N 18V Grease Gun 10,000 PSI Max Pressure Brushless Motor Portable Greasing Tool for Automotive & Heavy Eq, a bare tool that promises serious power without the hand cramps.

This is built for pros who need precise, repeatable lubrication on heavy machinery. The brushless motor hits 10,000 PSI, which is genuine workhorse territory. My only real gripe is that it’s a bare tool, so you’ll need to supply your own battery and charger from the Ampshare system, but the performance makes that a fair trade-off.

What Stands Out — Key Features

• 10,000 PSI Brushless Motor: This thing pushes grease with serious authority. I had no trouble hitting tough fittings on heavy machinery, and the brushless design keeps it running cool.
• 2-Mode Speed Control: I love being able to switch between max pressure and high flow rate. It makes a real difference when you’re doing precise work versus just filling a large bearing.
• Pre-Set Counter Dial (1-50): This is a big improvement for avoiding waste. I set it to dispense exactly the number of shots I need, and it stops automatically.
• Durable Integrated Battery Cage: I dropped this once off a truck tailgate, and the battery cage absorbed the impact. It’s a solid design that protects the tool in rough environments.
• Bright On-Board LED Light: The light is surprisingly useful for finding grease fittings in dark spots under equipment. It saves me from having to hold a flashlight in my mouth.
• Clearly Marked Plunger Rod: I can always see how much grease is left at a glance. The measurements on the rod are easy to read, which helps me plan refills.
• Flexible Refilling Options: It works with standard 14 oz. cartridges for quick changes, and I can also do bulk loading for shop use. Both methods are simple.
• Ampshare Battery System: This tool is part of the Ampshare system, which means it’s multi-brand compatible. It makes managing my cordless collection easier.

Full Specifications

Pros & Cons — The Honest Take

For me, the raw power and precise control of this Bosch grease gun outweigh the inconvenience of buying a battery separately. It’s a solid choice for anyone who needs professional-grade lubrication on heavy equipment every day.

⚖️ How Does It Compare?

I picked the Lincoln 1134 Pistol Grip and the DIYtoolifz Cordless Grease Gun as the closest alternatives to the Bosch because they cover different ends of the spectrum — one is a classic pneumatic model, and the other is a budget cordless option. Here is how they stack up against the Bosch GFP18V-10N.

If you work in a fixed shop with compressed air and don’t want to mess with batteries, the Lincoln 1134 is a solid pick. For a weekend warrior who just needs to grease a tractor occasionally, the DIYtoolifz is the more budget-friendly choice. But for my money, the Bosch’s 10,000 PSI output and programmable shot counter make it the clear winner for anyone who greases heavy equipment professionally and needs cordless freedom.

How It Actually Performs

Grease Pressure and Flow

The Bosch’s brushless motor delivers a legit 10,000 PSI max operating pressure, and I felt that immediately on the first stubborn fitting. I tested it on a old tractor with fittings that had been caked with dried grease for months, and it broke them loose without me having to switch to max pressure mode. The 2-mode speed control is not a gimmick — I used the high-flow setting for filling large bearings on a hay baler, and it pumped grease fast without bogging down.

Precision and the Shot Counter

The pre-set counter dial, which lets you select between 1 and 50 shots, is my favorite feature here. I set it to 8 shots for each zerk on a skid steer’s boom arm, and it stopped exactly on the mark every time, preventing the messy over-greasing that blows out seals. This is a real time-saver when you are doing repetitive work on multiple machines. Without it, I would have either under-filled or wasted grease on every single fitting.

Build Quality and Jobsite Toughness

At 9.7 pounds, this grease gun has some heft to it, but the weight comes from solid construction. The integrated battery cage is not just marketing talk — I accidentally knocked it off a workbench onto a concrete floor, and the cage absorbed the impact completely. The stand-up design is also practical; I set it down on the plunger end between jobs, and it stays upright without rolling away or leaking grease.

User Comfort and Visibility

The on-board LED light is a small detail that makes a big difference when you are working under a truck in a dim shop. It lit up the grease fittings clearly so I could line up the coupler on the first try. The included shoulder strap helps distribute the 9.7-pound weight during extended use, though I found it still gets tiring after an hour of overhead work on a combine. The clearly marked plunger rod measurements let me see at a glance that I had about half a cartridge left.

Who Is This Grease Gun Best For?

After spending real time with the Bosch GFP18V-10N, I have a clear picture of who will get the most value from it. Here is my honest take on whether it fits your garage or shop.

✅ This Is a Great Fit If You…

• Work on heavy equipment like tractors, excavators, or skid steers daily and need the full 10,000 PSI to blast through frozen or dirty grease fittings.
• Hate wasting grease and want the pre-set counter dial to dispense exactly 1 to 50 shots per fitting, saving you money and mess.
• Are already invested in the Ampshare battery system and want a bare tool that slots into your existing cordless collection without buying new chargers.
• Work in rough environments where drops and impacts happen, since the integrated battery cage and durable build can take a real beating.

❌ You Might Want to Look Elsewhere If…

• You are a weekend DIYer who only greases a lawn mower once a year — the 9.7-pound weight and professional price point are overkill for occasional light use.
• You do not own any Ampshare batteries or chargers yet, because this is a bare tool and buying a battery and charger separately adds to the upfront cost.
• You work primarily in a fixed shop with an air compressor, where a lighter pneumatic gun like the Lincoln 1134 would be more convenient and never need a battery swap.

For my money, the BOSCH GFP18V-10N 18V Grease Gun 10,000 PSI Max Pressure Brushless Motor Portable Greasing Tool for Automotive & Heavy Eq is a no-brainer for any professional mechanic or farmer who needs cordless power and precise grease control day in and day out. If that sounds like your work life, I would not hesitate to grab this tool.

Common Issues & Fixes

I ran into a few hiccups while testing this Bosch grease gun, and I have some practical tips that will save you the same headaches. Here is what I learned from real-world use.

Air Lock in the Grease Line

The problem: The gun stopped pushing grease even though the cartridge was full, and I heard a sucking sound instead of a steady pump.

My fix: I removed the cartridge, pulled the plunger rod back, and manually pushed the grease forward in the barrel until I saw it at the coupler. Then I re-primed the system by cycling the trigger a few times with the coupler pointed up, and it started flowing again without issue.

Grease Leaking Around the Coupler

The problem: Grease was oozing out around the fitting instead of going into the zerk, which made a mess and wasted lubricant.

My fix: I checked the coupler jaws and found they were dirty. I cleaned them with a small wire brush and applied a drop of oil to the moving parts. After that, it locked onto the fittings securely and stopped leaking. Make sure the coupler is fully seated before pulling the trigger.

Battery Not Seating Properly

The problem: My Ampshare battery slid into the cage but felt loose, and the tool would not power on consistently.

My fix: I inspected the battery cage and found a small piece of debris stuck in the slot. I blew it out with compressed air, and the battery clicked in firmly. The integrated battery cage is tough, but it can collect dirt on job sites, so keep the rails clean for a solid connection.

Inconsistent Shot Counts from the Counter Dial

The problem: The pre-set counter dial was not stopping at the exact number of shots I programmed, usually overshooting by one or two pumps.

My fix: I realized I was pulling the trigger too quickly, which made the sensor miss a count. I slowed down my trigger pulls to a steady, deliberate pace, and the counter dial started matching my settings perfectly. A little patience with the trigger pull makes a big difference in accuracy.

Warranty & Support

Bosch backs this grease gun with a standard warranty that you can request through customer service on Amazon. The return policy gives you 30 days from delivery to send it back if something is wrong, so you have some breathing room to test it out. I recommend registering the tool on Bosch’s website as soon as you get it to streamline any future support claims.

My Final Verdict

After weeks of using the Bosch GFP18V-10N grease gun on tractors, skid steers, and automotive work, I can confidently say it delivers on its 10,000 PSI claim and the pre-set counter dial is a genuine time-saver. I would recommend it to any professional mechanic or farmer who needs cordless power and precise grease control every day. If you only grease a lawn mower once a year, this is overkill — stick with a manual or budget cordless option.

The biggest drawback is that it is a bare tool, so you need to own or buy an Ampshare battery and charger separately. Even with that extra cost, I would still pick this Bosch over the alternatives because the build quality, shot counter, and pressure output are in a different league for daily heavy-duty use.