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generator oil

How Much Oil Does a Generator Take?

Be honest. Did you study your generator’s owner’s manual when you bought it? No? We didn’t think so! We understand that it’s not the most exciting thing to do. However, it is incredibly important to know how much oil your generator takes to keep it ticking over healthily.

Why? Because it will keep you, your family, your property, and your neighbors safe. Not to mention that it will save you money in the long run.

Don’t worry, we are here to help you. The whole oil business can get pretty confusing, so we’re going to give you the rough guidelines to follow.

Although, we should state right away that you need to always check the owner’s manual before going ahead. You don’t want to accidentally ruin your precious generator!

Anyway, let’s get right into the details, shall we?

To see our Choice for the best budget portable generators, Click here!

How Much Oil Does a Generator Take?

Ideally, you need to be checking your oil regularly. If you’ve noticed that your generator seized up a few days after use, it’s usually because you’ve neglected to check the oil level.

Thankfully, modern generators come with a low oil shutdown feature that can prevent any real damage from occurring. So, if it has stopped, your first port of call should be to check the oil.

As a general rule, change your oil every 100 hours of use. Of course, make sure it has had a chance to cool down before you actually make the change. We don’t want any catastrophic injuries or accidents occurring!

You will find that most generators take between 500 to 800 millimeters of oil. But this depends on the size and the brand. While we aren’t going to be able to give you specifics per brand, we’ll do our best to answer your “how much oil does a generator take?” question.

Sound like a plan? Excellent!

Suitable Oils

Honda 08207-10W30 PK2 Motor Oil
Genuine OEM Honda Part; Package Quantity: 2; SAE 10W-30
Briggs & Stratton SAE 5W-30 Synthetic Small Engine...
100% Synthetic SAE 5W-30; For Use In All Air Cooled 4-cycle Engines; 32 Oz. bottle
AmazonBasics Full Synthetic Motor Oil - 5W-30 - 5...
Formulated for longer drain intervals; Helps prevent build up that can cause rust and corrosion
Castrol 03057 GTX MAGNATEC 5W-30 Full Synthetic...
Dramatically reduce engine wear; Superior wear protection on critical engine parts; Castrol recommends the use of Bosch oil...

Last update on 2020-10-28 / Affiliate links / Images from Amazon Product Advertising API


#1 Westinghouse

Westinghouse Generator ModelOil Capacity
iGen2200350 ml
iGen2500350 ml
iGen4500600 ml
WGen2000600 ml
WGen3600600 ml
WGen3600v600 ml
Disclaimer: Of course, you should always check the manual of your specific generator to know exactly how much oil to put into your model.

No, this isn’t all the generators that Westinghouse makes. The brand sells larger ones too, however, we’re not going to be covering all the models of every brand.

Also, bear in mind that the user manual stipulates the importance of not overfilling it. Doing so can lead to lots of problems like fires, serious engine damage, and damage to surrounding property. So, before filling, ensure the generator is on a level surface. This way, the oil level reading will be as accurate as possible.


#2 Briggs & Stratton

Briggs & Stratton Generator ModelOil Capacity
P2200 PowerSmart500 ml
P2400 PowerSmart500 ml
3200A Portable500 ml
1200A SPRINT Portable500 ml
Disclaimer: Of course, you should always check the manual of your specific generator to know exactly how much oil to put into your model.

#3 DuroMax

DuroMax Generator ModelsOil Capacity
XP1300E1200 ml (1.2 L)
XP10000E900 ml
Disclaimer: Of course, you should always check the manual of your specific generator to know exactly how much oil to put into your model.

DuroMax generators are a bit different when it comes to finding the specific oil capacities in the owner’s manual. Unfortunately, it just doesn’t list it. Instead, you have to refer to the sticker on the generator itself. We found this a little strange and were hunting around for ages!


#4 Champion

Champion Generator ModelOil Capacity
170cc Inverter560 ml
224cc Inverter560 ml
2000 Watt Inverter370 ml to 470 ml
3500 Watt Inverter560 ml
Disclaimer: Of course, you should always check the manual of your specific generator to know exactly how much oil to put into your model.

Champion is very helpful as their Customer Service Center tells you exactly how many quarts are required for all of their models. We’ve converted a few of the most popular ones to ml here for you. But take a look in your owner’s manual to read the specific instructions too.


#5 Firman

Firman Generator ModelOil Capacity
P03602600 ml
ECO 4000620 ml
ECO 4000RE620 ml
Disclaimer: Of course, you should always check the manual of your specific generator to know exactly how much oil to put into your model.

Just like the Westinghouse, Firman emphasizes the importance of ensuring your generator is on a flat and level surface before filling to improve accuracy.


#6 Ford

Ford Generator ModelOil Capacity
FG11050PE1200 ml (1.2 L)
FG2500iS350 ml
FG3050P(E)600 ml
FG4050P(E)600 ml
FG4650P(E)600 ml
Disclaimer: Of course, you should always check the manual of your specific generator to know exactly how much oil to put into your model.

If you’re looking for your Ford generator’s oil capacity online, be careful not to fall into their cars’ oil capacity category. It’s quite easy to do, so make sure you check the headings before trying to cram 3.5 L of oil into your portable generator!


#7 Honda

Honda Generator ModelOil Capacity
EU2000i400 ml
EU1000i250 ml
Disclaimer: Of course, you should always check the manual of your specific generator to know exactly how much oil to put into your model.

The Bottom Line

As you can see, the amount of oil needed for each generator changes drastically — even if they’re made by the same company. This is why we’ve been encouraging you to check your owner’s manual before going ahead and filling it up.

Remember, it isn’t just the oil amount that you need to be aware of, it’s the type of oil too. Viscosity plays a vital role in keeping your generator happy and healthy.

This will be stated inside the owner’s manual, as well as on the label of your generator. It’s best to know the specifics before you purchase it so you can have everything you need by the time it arrives.

Suitable Oil for a portable generator

Honda 08207-10W30 PK2 Motor Oil
  • Genuine OEM Honda Part
  • Package Quantity: 2
  • SAE 10W-30
Briggs & Stratton SAE 5W-30 Synthetic Small Engine...
  • 100% Synthetic SAE 5W-30
  • For Use In All Air Cooled 4-cycle Engines
  • 32 Oz. bottle
AmazonBasics Full Synthetic Motor Oil - 5W-30 - 5...
  • For best performance, follow the manufacturer's recommendations in your vehicle owner’s manual.
  • Formulated for longer drain intervals
  • Helps prevent build up that can cause rust and corrosion
  • Reduces friction for less engine wear
  • High resistance to viscosity and thermal breakdown
Castrol 03057 GTX MAGNATEC 5W-30 Full Synthetic...
  • Dramatically reduce engine wear
  • Leave critical engine parts 4X smoother* * As tested in the industry Sequence IVA wear test
  • Superior wear protection on critical engine parts
  • Meets Specifications: API SN Plus, ILSAC GF-5, GM dexos1 Gen 2, Ford WSS-M2C929-A, WSS-M2C946-B1
  • Castrol recommends the use of Bosch oil filters

Last update on 2020-10-28 / Affiliate links / Images from Amazon Product Advertising API


All the article on Oofgrid offer help and practical advice for using and purchasing a portable generator. However, We are enthusiasts and not qualified electricians. Always seek professional advice when working with electrical or Petrol appliances.