---
product_id: 351930282
title: "5665 Maintenance Kit for 20kW, 999cc Engine - Keep Your Generator in Top Condition"
brand: "generac"
price: "€ 84.36"
currency: EUR
in_stock: true
reviews_count: 5
category: "Generac"
url: https://www.desertcart.hr/products/351930282-5665-maintenance-kit-for-20kw-999cc-engine-keep-your-generator
store_origin: HR
region: Croatia
---

# 200-hour/2-year service interval 20kW power capacity Complete maintenance kit 5665 Maintenance Kit for 20kW, 999cc Engine - Keep Your Generator in Top Condition

**Brand:** generac
**Price:** € 84.36
**Availability:** ✅ In Stock

## Summary

> ⚙️ Keep your power flowing, your peace of mind glowing!

## Quick Answers

- **What is this?** 5665 Maintenance Kit for 20kW, 999cc Engine - Keep Your Generator in Top Condition by generac
- **How much does it cost?** € 84.36 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/351930282-5665-maintenance-kit-for-20kw-999cc-engine-keep-your-generator)

## Best For

- generac enthusiasts

## Why This Product

- Trusted generac brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Stay Ready for Anything:** Maintain reliable backup power when it matters most—no surprises, just peace of mind.
- • **Maximize Generator Lifespan:** Regular tune-ups with genuine parts protect your investment and warranty.
- • **All-in-One Maintenance Powerhouse:** Everything you need to keep your 20kW Generac running flawlessly.
- • **DIY Friendly with Pro-Level Results:** Includes easy-to-follow instructions and tools for confident self-maintenance.
- • **Precision Fit for 999cc OHVI Engines:** Tailored components ensure perfect compatibility and peak performance.

## Overview

The Generac 5665 Maintenance Kit is a comprehensive, factory-original service kit designed specifically for 20kW home standby generators with 999cc air-cooled OHVI engines. It includes all essential components—air filter, oil filter, spark plugs, oil funnel, chamois, and reminder sticker—to perform scheduled maintenance every 200 hours or 2 years, ensuring optimal performance, extended engine life, and warranty compliance.

## Description

Scheduled maintenance is a necessity for all standby generators. The Air-Cooled Scheduled Maintenance Kits offer all the components necessary to perform a complete maintenance on Generac air-cooled generators. Maintenance is recommended at every 200 hours or 2 years. If running in a dusty environment, more frequent maintenance may be required.

Review: Good 👍
Review: We live in the middle of the "Hurricane Alley" Texas gulf coast and last year we bought and had installed a Generac 20KW totally automatic natural gas fired 999cc generator from Wired Electric, who did a nice job at a decent price. Part of the secret to anything mechanical lasting more than a couple of years is proper and regular maintenance. In the case of the Generac here, once a year you need to change air filter, oil filter, spark plugs and motor oil to keep your warranty current. Wired lets the homeowner do that if they wish so long as they document the maintenance and can prove they did, in deed do the scheduled work at the scheduled intervals and did it properly and correctly. I am a mechanicaly inclined guy so I opted to do that, according to the owners manual and precisley as instructed with genuine replacement parts. OK, so what does a "kit" consist of? Well, in the box there is a spin on replacement oil filter and a dandy paper funnel to put the oil in your motor, a little handy spark plug wrench and two Champion replacement plugs, an exact fit air filter and a drop cloth to help with any spills. I have seen guys charging 40 bucks or more per kit and when I found this provider offering the same for only 15 bucks a pop, I said "stock up". And I did just that. Exactly as described and exactly as the factory originals because it is factory original merchandise at an affordable rate. Oh yeah, our Wired technician, Joe told me to use a high quality 10/W/40 oil when changing it out. Takes 1.9 US quarts which includes oil filter capacity when changed every year. I selected Mobil fully synthetic "High Mileage" oil since this is an air cooled motor and who knows when it may be used for considerable days on end in the event of whatever perils lurk out there? I know my other Texas based reviewer says he does not recommend using synthetics in warm climates (Based on what???) I wanted to back up my recommendation to use synthetic oil in ANY air cooled motor with the following recommendation from aircooled.net's own tech talk forum "Since synthetic oil has better heat transfer qualities than dino oil, your internal engine temperatures will be lower. Things like bearings, especially, will not operate at as high of a temperature as a result. The wider range of temperatures that synthetic oil can withstand is well suited for the air-cooled VW engine. With head temperatures normally between 300-350 degrees, synthetic will not breakdown while lubricating the valve train components at the heads. The better lubricating properties of synthetic in general will lead to a longer engine life as well. On average, when synthetic oil is run in an air-cooled VW engine, head temperatures stay the same, but engine oil temps reduce by anywhere from 10 to 15 degrees. This is in identical engines that have all the correct cooling tin in place, and are not suffering from overheating to begin with. Important note: Do not run synthetic to fix a hot running engine. Find the real reason it's running hot, and fix it!" There you have it. Your Generac is also an AIR COOLED engine and is made of the same materials as a VW, Corvair or any other air cooled engine. This is THEIR recommendation, not mine. Go for it.

## Features

- Complete Maintenance Kit: The Generac 5665 Maintenance Kit is specifically designed for 20kW home standby generators, providing all the necessary components for optimal maintenance
- Optimum Performance: Regular tune-ups are essential for keeping your generator running at its best. This kit ensures your generator operates at peak performance when you need it most
- Comprehensive Contents: The kit includes essential items such as an air filter, oil filter, oil funnel, spark plug, chamois, instruction manual, and a convenient reminder sticker
- Compatibility: Designed for air-cooled standby generators with 999cc Generac OHVI engines, ensuring a perfect fit and proper maintenance for reliable operation
- Reliable Power Solution: With this maintenance kit, you have all the necessary parts at hand for regular maintenance tasks, including air filter replacement, oil filter change, spark plug replacement, and more

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B003TSFYHY |
| Batteries Included? | No |
| Batteries Required? | No |
| Brand Name | Generac |
| Color | Orange |
| Customer Reviews | 4.8 4.8 out of 5 stars (533) |
| Date First Available | 29 April 2013 |
| Fuel type | Gasoline |
| Included Components | Air Filter, Oil Funnel, Spark Plug, Chamois, Instruction Manual, Reminder Sticker |
| Item Weight | 703 g |
| Model Info | 5665 |
| Part Number | 5665 |
| Product Dimensions | 17.78 x 17.78 x 15.24 cm; 703.07 g |
| Special Features | Portable |
| Wattage | 20 KW |

## Product Details

- **Brand:** Generac
- **Fuel type:** Gasoline
- **Power source:** Gasoline
- **Recommended uses for product:** Residential
- **Wattage:** 20 KW

## Images

![5665 Maintenance Kit for 20kW, 999cc Engine - Keep Your Generator in Top Condition - Image 1](https://m.media-amazon.com/images/I/71YF1LIApTL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by M***A on 22 January 2026*

Good 👍

### ⭐⭐⭐⭐⭐ Review
*by B***T on 9 May 2012*

We live in the middle of the "Hurricane Alley" Texas gulf coast and last year we bought and had installed a Generac 20KW totally automatic natural gas fired 999cc generator from Wired Electric, who did a nice job at a decent price. Part of the secret to anything mechanical lasting more than a couple of years is proper and regular maintenance. In the case of the Generac here, once a year you need to change air filter, oil filter, spark plugs and motor oil to keep your warranty current. Wired lets the homeowner do that if they wish so long as they document the maintenance and can prove they did, in deed do the scheduled work at the scheduled intervals and did it properly and correctly. I am a mechanicaly inclined guy so I opted to do that, according to the owners manual and precisley as instructed with genuine replacement parts. OK, so what does a "kit" consist of? Well, in the box there is a spin on replacement oil filter and a dandy paper funnel to put the oil in your motor, a little handy spark plug wrench and two Champion replacement plugs, an exact fit air filter and a drop cloth to help with any spills. I have seen guys charging 40 bucks or more per kit and when I found this provider offering the same for only 15 bucks a pop, I said "stock up". And I did just that. Exactly as described and exactly as the factory originals because it is factory original merchandise at an affordable rate. Oh yeah, our Wired technician, Joe told me to use a high quality 10/W/40 oil when changing it out. Takes 1.9 US quarts which includes oil filter capacity when changed every year. I selected Mobil fully synthetic "High Mileage" oil since this is an air cooled motor and who knows when it may be used for considerable days on end in the event of whatever perils lurk out there? I know my other Texas based reviewer says he does not recommend using synthetics in warm climates (Based on what???) I wanted to back up my recommendation to use synthetic oil in ANY air cooled motor with the following recommendation from aircooled.net's own tech talk forum "Since synthetic oil has better heat transfer qualities than dino oil, your internal engine temperatures will be lower. Things like bearings, especially, will not operate at as high of a temperature as a result. The wider range of temperatures that synthetic oil can withstand is well suited for the air-cooled VW engine. With head temperatures normally between 300-350 degrees, synthetic will not breakdown while lubricating the valve train components at the heads. The better lubricating properties of synthetic in general will lead to a longer engine life as well. On average, when synthetic oil is run in an air-cooled VW engine, head temperatures stay the same, but engine oil temps reduce by anywhere from 10 to 15 degrees. This is in identical engines that have all the correct cooling tin in place, and are not suffering from overheating to begin with. Important note: Do not run synthetic to fix a hot running engine. Find the real reason it's running hot, and fix it!" There you have it. Your Generac is also an AIR COOLED engine and is made of the same materials as a VW, Corvair or any other air cooled engine. This is THEIR recommendation, not mine. Go for it.

### ⭐⭐⭐⭐⭐ Review
*by K***B on 27 August 2025*

⭐️⭐️⭐️⭐️⭐️ (5/5) Don’t pay $300 for someone else to do it—this kit makes maintenance a breeze! All the parts fit perfectly as advertised, and it’s easy to handle the service yourself. Highly recommend for saving money and keeping your Generac running smoothly.

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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-05-16*