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Which 30 Weight Oil Do I Use, 0W-30, 5W-30 or
We get asked this question
so often that we have included this special page dedicated exclusively
to answering the question.
AMSOIL 0W-30, 5W-30 and 10W-30 synthetic motor oils are ALL 30
weight oils. The answer is that ANY one can be used regardless
if your vehicle owners manual says to use, for example, a 5W-30.
"W" means winter. In winter weather the 0W oil will flow like a
0W oil, and the 5W will flow like a 5W oil and a 10W will flow like
a 10W oil just until the engine warms up. In order to understand
the differences one has to first understand that the numerical
values given to these various weight oils are strictly empirical
numbers. For example, 0W does not mean that the oil has no weight.
That is one of the reasons why we say it is strictly an empirical
In order to determine the differences between the three oils one
has to look at the kinematic viscosity of each lubricant. The kinematic
viscosity is essentially the amount of time, in centistokes, that
it takes for a specified volume of the lubricant to flow through
a fixed diameter orifice at a given temperature.
Let's compare the kinematic viscosity of
the three AMSOIL lubricants:
AMSOIL 0W-30 is 57.3 cST @ 40 deg. C, & 11.3 cST @ 100 deg.
AMSOIL 5W-30 is 59.5 cST @ 40 deg. C, & 11.7 cST @ 100 deg.
AMSOIL 10W-30 is 66.1 cST @ 40 deg. C, & 11.7 cST @ 100 deg.
As you can see from the data above the kinematic viscosities are
extremely close. Therefore, whether you use the 0W-30, 5W-30 or
the 10W-30 is strictly a matter of choice. With the small differences
in kinematic viscosity you would be hard-pressed to detect these
differences on initial engine start-up without specialized engine
All three oils are excellent motor oils and
ANY one can be used in a vehicle which requires either a 0W-30,
5W-30 or 10W-30 oil as well as in several other engine applications
including an engine which recommends a 5W- 20 oil.
AMSOIL Series 2000 0W-30 Severe Service motor oil is one of the
best synthetic lubricants AMSOIL manufacturers for gasoline engine
passenger vehicles and light trucks. The molecular and chemical
technology used to develop this oil was derived from AMSOIL's Racing
Oil. It is a 35,000 mile/1-year motor oil. This is the same oil
used by numerous police vehicles and severe duty fleets nationwide.
In fact, many national racing teams use the 0W-30 for the qualifying
event, then they change to the AMSOIL 20W-50 Racing Oil for the
race. The extra horsepower and friction reduction from the 0W-30
often assists a race driver in attaining a better starting position.
In fact, we know exactly which race teams use it, but cannot disclose
This leads to the next topic: many people also ask us if the
0W-30 is too thin a viscosity oil for high ambient temperature operation.
The answer is absolutely not! Thicker viscosity oils are not always
necessarily better since in addition to its' various engine lubrication
functions, an oil must also effectively transfer heat. Only about
60% of an engines cooling is performed by the engine coolant, and
only on the upper half of the engine. The remaining 40% of an engines
cooling is performed mainly by the engine oil.
Although a vehicle that is recommended to use a 30 weight oil can
also use a 40 weight oil, it is usually not needed. You will gain
absolutely no benefit from using a thicker viscosity oil if it is
not needed. The only time we recommend a 40 weight oil, such as
AMSOIL's 10W-40, to a customer in a passenger car or light truck
application is if the vehicle's engine is excessively worn and consumes
oil at a higher than normal rate or if the vehicle is being used
for very severe duty, high load, high temperature applications.
We hope this brief discussion has answered your questions. If we
have not sufficiently answered your questions or if you would like
an additional explanation or recommendation for your specific application
please email us using the link at the bottom of this page.
is the undisputed leader in synthetics.............
Since 1972, AMSOIL Synthetics have proven to be the
BEST. AMSOIL also engineers and manufactures Super Duty Oil filters which have a
12,500 mile service life as well as specialized filtration systems for
commercial and fleet applications in cars and light, medium and heavy trucks
which can filter particles down to less than one micron ( a standard full flow
oil filter can only filter to 20-25 microns with any degree of efficiency) making oil changes virtually unnecessary and virtually eliminating engine wear.
These filters have been proven by millions of miles of over-the road trucks,
construction equipment and fleet service.
AMSOIL saves you time and money.
The only 25,000 mile/one- year and 35,000/one-
year motor oil in the world.
Exceeds the most stringent performance
specifications of all major U.S. and foreign automotive and truck
Provides up to two-times the wear protection of
other motor oils.
Increases the life of your vehicle.
Improves performance, fuel economy and
Diesel oil and filtration products designed to
deliver 1,000,000 miles for over-the-road trucks before engine overhaul.
Used by many national racing teams, fleets,
police departments, construction firms and trucking companies.
Oilsnmore.com is comprised of a group of highly skilled team of Engineers and Lubrication and
Filtration Specialists. You too, can join our group when you become an AMSOIL
Dealer and take advantage of all that we offer as you use products in your own
vehicles or begin your own AMSOIL business. You won't find a more knowledgeable
and skilled group of Dealers anywhere which is very important when you need
support as you build your business.
In addition, as a Dealer in our group you will receive exclusive unlimited
product, technical and business support from the only group of Truck and
Automotive Engineers and Lubrication Specialists on the net.
We do not only run our business on the internet. We also have numerous
commercial, industrial, trucking, excavating, construction, logging, police,
racing and many more accounts that we support and service on a regular basis. We
have several fully stocked warehouses and fully equipped shop facilities. This
provides us with excellent knowledge of the products, equipment and the business
and the ability to respond immediately to any of your needs.
We will use this
knowledge and experience to help you get started so you too can achieve your
We possess the skills, desire and knowledge to answer questions, solve problems,
improve efficiency, reduce downtime, maintenance costs and increase the
durability and life of all of your vehicles.
Read what our satisfied customers have to say about us. Read through our
website. Contact us with any questions. If you decide to become an AMSOIL Dealer
you will be joining, in our opinion, the most skilled AMSOIL group there is. We
will help you get started and provide you with the tools and information in
order to be successful in this business or with technical and product assistance
to use AMSOIL products in your own vehicles.
We offer several options to receive information on AMSOIL. We welcome the
opportunity to work with your personally as your servicing AMSOIL Dealer. Our
AMSOIL Dealer Group is led by a Truck/Automotive Engineer and Lubrication
Specialist with over 18 years experience. This exceptional benefit is
Please, email us at
we will send you an exclusive
comprehensive package of product, technical and business information.
If you are
serious about AMSOIL products and the business opportunity this is the best
option. You will receive extensive technical and business support from both
myself and my Direct Jobber, a Detroit, Michigan Truck/Automotive Engineer and
Lubrication Specialist with over 19 years experience. We look forward to helping
you learn about AMSOIL.
Or for a smaller, very general information package (which includes a catalog and
Dealer application) you can request information via any of the links below.
To request a FREE Factory Direct Catalog
For Information on Becoming an AMSOIL Dealer
To Buy AMSOIL Products in the AMSOIL On-Line Store
To Sell AMSOIL in Your Store or Purchase For Use in
Your Businesses Equipment
To visit the AMSOIL Corporate Website for Product
and Business Opportunity Information
AMSOIL is Proudly Made in the U.S.A.
AMSOIL is America's Oil.
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