Generac GP6500 Generator Oil Type Guide

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Find out what oil type to use for your Generac GP6500 so you can get optimal performance out of your generator.

The oil types you can use for the Generac GP6500 are SAE 10W-30 oil at -10°F to 40°F, SAE 30 oil at 32+°F, and synthetic 5W-30 oil at all temperature ranges.

However, Generac does note you want to use petroleum-based oil for the engine break-in before using synthetic oil.

That aside, the oil capacity of the Generac GP6500 is 33.92 fluid ounces which is about 1 liter.

Next, you want to change the oil of your Generac GP6500 after the first 20 hours of operation and every 100 hours after that.

Recommended Generac GP6500 Oil Type After Break-In

Recommended Generac GP6500 Oil Type After Break-In

What kind of oil does a Generac GP6500 generator take?

To give your Generac GP6500 the best chance of performing for years to come, you want to make sure you use the right oil types.

There are a few different guidelines related to this in the Generac GP6500 user manual.

First of all, you can use SAE 10W-30 oil at temperatures of -10°F to 40°F and SAE 30 oil at temperatures of more than 32°F.

Generac also notes you want to use petroleum-based oils for the engine break-in period.

After that, you can also use synthetic 5W-30 oil in the Generac GP6500 at all temperature ranges.

Can you use synthetic oil in a Generac GP6500 generator?

As Generac mentions on their FAQ page and manuals, you can use synthetic oil in a Generac GP6500 generator after the initial break-in with petroleum-based oils.

More specifically, synthetic 5W-30 oil can be convenient if you don’t have to worry about finding the right oil type for different temperature ranges.

What is the oil capacity of the Generac GP6500?

Once you know what type of oil you need, you likely want to know how much you need to buy for the Generac GP6500.

The Generac GP6500 has an oil capacity of 1.06 US quarts which is about 33.92 fluid ounces or 1 liter.

You can check out the recommended oil change intervals below to get an idea of what your stock of oil should look like.

Keep in mind that motor oils have expert dates (often around five years).

There is a limit to how much you can get and store at once.

Recommended Generac GP6500 Oil Type After Break-In

Recommended Generac GP6500 Oil Type After Break-In

Generac GP6500 oil change interval

Engine oil is not something you set and forget.

To keep your Generac GP6500 functioning you have to replace the oil every once in a while.

Generac recommends on their FAQ page to change the oil of the Generac GP6500 after the first 20 to 30 hours of break-in operation.

After that, you want to change the oil of your Generac GP6500 about every 100 hours of run time.

Related posts:

FAQ

How many quarts of oil does a Generac GP6500 generator take?

A Generac GP6500 generator takes 1.06 US quarts of oil.

Recommended Generac GP6500 Oil Type After Break-In

Recommended Generac GP6500 Oil Type After Break-In

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Author:

Mats is the founder and head editor of Generator Decision. With a combination of critical thinking, tireless research, and a healthy interest in electronics he helps people find the right generators and how to use these. At this point in the journey, Mats has done research on hundreds of portable generators.