Generac Scheduled Maintenance Kit for 20kW Air-Cooled Home Standby Generators | Pre-2013 Units

This Generac Scheduled Maintenance Kit for 20kW Air-Cooled Home Standby Generators Gives an Older Unit a Complete Service

The Generac 5665 is a scheduled maintenance kit for the 20 kW air-cooled home standby unit with a 999cc engine. It includes an air filter, oil filter, two spark plugs, a spark plug wrench, an oil funnel, a chamois, and a reminder sticker.

It is for older 20 kW units made before 2013. For 2013 and newer 20 and 22 kW units, Generac lists the 6485. Your generator's data label shows the model and size, so check it before you order.

Generac Scheduled Maintenance Kit for 20kW Air-Cooled Home Standby Generators Features

One Kit Covers the Scheduled Service

The Generac 5665 kit has an air filter, an oil filter, and two spark plugs in one box. Generac builds it for the 20 kW air-cooled home standby unit with a 999cc engine, so you are not matching parts one at a time.

Two Spark Plugs for the 999cc Engine

The kit includes two spark plugs for the 20 kW unit. Replace both plugs during the same visit as the air and oil filters.

Funnel, Chamois, and Reminder Sticker

The kit also includes a spark plug wrench, an oil funnel, a chamois, and a reminder sticker. The funnel keeps the oil fill clean, the chamois wipes up drips, and the sticker helps you keep track of when the next service is due.

Real-World Applications

Whole-Home Backup Upkeep. An older 20 kW unit needs its filters and plugs changed on schedule so it is ready when the power fails.

Service Due on Your 20kW Unit. If your 20 kW generator has reached 200 hours or 2 years, this kit gives you the air filter, oil filter, and two plugs in one step.

Pre-Season Check. Service the unit ahead of storm or winter season, then use the reminder sticker to mark when the next service is due.

Practical Comparison

Versus the Generac 6485 Kit. The 6485 is Generac's kit for 20 and 22 kW units made from 2013 on, and its fit list is much longer. The 5665 is the older kit for 20 kW units made before then.

Versus Ordering Each Part Separately. A 999cc engine needs the right air filter, oil filter, and two plugs. This kit puts those together, plus the wrench and funnel.

Is the Generac 5665 Kit the Right Fit

• Unit Size. It is listed for the 20 kW unit with a 999cc engine.
• Age of Unit. It is meant for older units made before 2013.
• Spark Plugs. The kit has two spark plugs and a wrench.
• Oil. Oil is not included. Buy it separately.

This May Be a Good Fit If

• Your home standby generator is a 20 kW unit made before 2013
• Your engine is 999cc
• You want two plugs and both filters in one kit
• You need a plug wrench with the parts

Common Questions

Will the Generac 5665 fit my 20kW generator?

It is listed for the older 20 kW unit with a 999cc engine. Generac's 2010 sheet lists it by size, not by model number, so confirm the size and build year on your data label.

What if my 20kW unit was made in 2013 or later?

Generac's newer sheets list the 6485 for 20 and 22 kW units from 2013 on. Use that kit instead.

Do I need to buy oil?

Yes. Oil is not included. Generac lists SAE 30 above 32 F, 10W-30 between 40 F and -10 F, and synthetic 5W-30 for all temperature ranges.

What's Included

• 1 x Air Filter
• 1 x Oil Filter
• 2 x Spark Plugs
• 1 x Spark Plug Wrench
• 1 x Oil Funnel
• 1 x Chamois
• 1 x Reminder Sticker

Keep Your 20kW Generator Ready for Outages

The Generac Scheduled Maintenance Kit for 20kW Air-Cooled Home Standby Generators covers the full routine service for an older 20 kW unit. If you are unsure which kit fits your generator, the Outbound Power team can help you choose.

Generac 5665 Scheduled Maintenance Kit Spec Sheet