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The Generac full synthetic 5w30 engine oil (12 quart) is available for purchase today.

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Generac Full Synthetic 5W30 Engine Oil (12 Quart)

(Based on expert analysis, manufacturer ratings and customer reviews)
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5
4 Reviews
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  • Features
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  • 4
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Generac Full Synthetic 5W30 Engine Oil (12 Quart)
High quality synthetic base fortified w/ an advanced additive

Longer Engine Life
Maximum protection against viscosity breakdown
Protects against the formation of sludge & varnish deposits

Reccomended for Use In All Gasoline Engines
Exceeds API SN service classification requirement

*Note Always Follow Recommended Oil Weight In Your Owner's Manual
Need one quart see 0J5140
Product Specs
Frequency
60 Hertz
Overview
UPC
696471051414
Model
0J5141
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  2 Questions
Q: I purchased a Generac generator from you a few months ago. The directions say that below 40 degrees, 10W-30 oil should be used. I presently have 30 weight oil in the generator. With the weather below 40 degrees, can I still leave the 30 weight in or is it best to actually drain it and replace it with 10W-30?

by Howard Tolk from Connecticut on February 04, 2014

A: Thanks for your inquiry.

All oil should meet minimum American Petroleum Institute (API) Service Class SJ, SL or better. Use no special additives. Select the oil's viscosity grade according to the expected operating temperature.

Above 40 F, use SAE 30
Below 40 F and down to 10 F, use 10W-30
Below 10 F, use synthetic 5W-30

Multi-viscosity oils are those denoted by two numbers with a 'W-' in between (for example, 10W-30 or 20W-50). The 'W' originally stood for winter, as oils were developed to compensate for the wear due to the vast temperature ranges then. They're almost exclusively used today rather than straight-weight (monograde) oils. Multi-viscosity oils use polymer additives to change the natural consistency of oil as its heated, preventing it from thinning out as much as it otherwise would.

The only downside to this is that some of the additives used to improve viscosity at high temperatures can also leave sticky deposits. Oil companies have mostly eliminated such problems by adding detergents to oil, along with rust inhibitors and antioxidants. Some precise performance engines will still require straight-weight oil, but all newer vehicles are designed for multi-viscosity oil and require it, else your warranty will probably be void.

What the numbers mean.

The numbers in motor-oil nomenclature refer to the viscosity (thickness) of the oil. A higher number corresponds to thicker oil, while a lower number refers to thinner oil. The numbers themselves are supposed to correspond to a set of real, measurable qualities in the oil, one of which is the viscosity index. In multi-viscosity oils, the left number refers to cold behavior of the particular oil, while the right number refers to its hot (100 degrees Celsius) behavior. So, for instance, 5W-30 oil would flow well when cold like 5-weight oil, but protect at high temperatures like 30-weight oil.

Do oils vary much by brand? Yes. The 5W-30 oil from one company might equal 10W-40 oil from another company in viscosity, because there might be a difference in some of the other properties of the oil, like its flash point (at what temperature it ignites). The numbers in multi-viscosity oil also don't tell anything about how viscous the oil is at normal engine operating temperatures, as opposed to extremes. The best advice here is to choose a familiar brand, and experiment with other major brands if you think it's too thin or too thick. Never mix brands or different weights. Wait until an oil change.

What about synthetics?

Synthetics are better in every way, but they are much more expensive. They offer better high-temperature resistance and better low-temperature flow, and they leave nearly no deposits. Prices for synthetics are coming down, though, and there are also blends that combine synthetics with traditional mineral oils. Because synthetics flow and penetrate much better than regular oils, a change to synthetic oil will sometimes reveal leaks you didn't know existed.

Ratings

The American Petroleum Institute (API) assigns letter ratings to motor oil. The category ratings correspond to industry standards for various qualities like viscosity, thermal protection, and preventing deposits and sludge. Every few years, the currently awarded rating is changed. Currently, SL (Spark ignition, Category L) is the top rating. SJ was introduced in 2001 and SH in 1996.

As your car ages and becomes a high-mileage vehicle, many experts recommend that you change to thicker oil than is normally used. Over time, gaps between parts in the engine become larger, enabling less oil to reach critical parts. Ask a mechanic familiar with your model vehicle or ask the dealership if you should change the type of oil for your vehicle beyond 100,000 miles.

The underlying message is that all oil is not the same. Making sure you use the correct viscosity rating is just the start. The quality and characteristics of oils can vary greatly by brand, too.



by Jared, Product Expert
Q: Is this the same oil that is included in the maintenance kits?
by Kyle from Maine on January 21, 2014

A: This is the same oil that is included in the maintenance kit that comes with the 5W30 Synthetic oil.......

Generac Air Cooled Maintenance Kits

by Jared, Product Expert
Generac 0J5141 Reviews & Ratings
4 Reviews  Sort by 
 
Jesse G.
Purchased from Electric Generators Direct
Purchased 6/13/16
Most Helpful Positive Review
REVIEWED
JUL.
05
2016
5 out of 55 out of 55 out of 55 out of 55 out of 5
Was In A Jam
Need oil fast for a bunch of service work came on time and saved us. Thanks a million
Jesse Recommends This Generac Product
Jesse's Experience With Electric Generators Direct
Web Site
5/5

Service
5/5

Shipping
5/5
"Great online store will use them for all my generator needs."
 more
Was this review helpful?
00
David F.
Republic, OH
Purchased from Electric Generators Direct
Purchased 12/25/15
Total Reviews
2 Reviews
REVIEWED
FEB.
29
2016
5 out of 55 out of 55 out of 55 out of 55 out of 5
Oil In A Pinch
I had just installed my Generac whole house generator, and was going thru the setup procedures along with checking the type of oil that was to be used in my area for the climate.The oil that was shipped with the unit wasn't going to work in my colder area. I was going to be leaving for an extended amount of time for that was the reason for the purchase of the generator and only had several days before my departure. I had checked online and found the best price for the case of Generac oil thru... more
David Recommends This Generac Product
Manufacturer Response
Brand Rep
David,
Please know that the oil shipped with the unit should be utilized for the extent of the unit's break-in period. This is to ensure that the product is properly lubricated for long-term use. After the break-in period has passed, you can then transition to any alternative oil listed in the product's owner's manual. For information regarding the unit's break-in period and maintenance requirements, we would recommend referring to the Maintenance section of the unit's owner's manual. If you on longer have access to this documentation, please know that a duplicate copy can be obtained online by using your unit's model or serial number for searching purposes here: http://www.generac.com/service-support/product-support-lookup?cid=frm-105-ac
more
David's Experience With Electric Generators Direct
Web Site
5/5

Service
5/5

Shipping
5/5
"Everything went better than expected. Thanks"
 more
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00
Joseph D.
Wakefield, RI
Purchased from Electric Generators Direct
Purchased 11/14/15
REVIEWED
DEC.
11
2015
5 out of 55 out of 55 out of 55 out of 55 out of 5
All Good
All good products at a reasonable price.
Joseph Recommends This Generac Product
Joseph's Experience With Electric Generators Direct
Web Site
5/5

Service
5/5

Shipping
5/5
"All good."
 more
Was this review helpful?
00
Roger A.
Park City, MT
Purchased from Electric Generators Direct
Purchased 4/30/15
Total Reviews
7 Reviews
REVIEWED
JUL.
06
2015
5 out of 55 out of 55 out of 55 out of 55 out of 5
Synthetic Oil
We ordered a case of the Generac Full Synthetic 5W30 Engine oil for our new generator. Wanted to be sure to have it on hand when we need it.
Roger Recommends This Generac Product
Was this review helpful?
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Free Freight
  • Ships via FedEx Ground
We currently CANNOT ship this product to Alaska, Hawaii or any destination outside of the United States
 


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