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Frequently Asked Questions

Purchasing AMSOIL Products

How can I purchase AMSOIL products?
How long have AMSOIL lubricants been on the market?

Becoming an AMSOIL Dealer

Are AMSOIL Dealers required to sell products?
Is it possible to earn a residual income as an AMSOIL Dealer?
Are there costs required to cancel an AMSOIL Dealership?

Synthetic Oil Basics and Switching From Petroleum to Synthetic

Can AMSOIL lubricants be safely mixed together?
What is the difference between synthetic and conventional oil?
What roles do additives play in motor oil performance?
Can synthetic oil be used in new engines?
Must new cars be broken in using petroleum oil?
Why is there an hours limit in addition to time and mileage limits on AMSOIL synthetic motor oil’s service life?
Will synthetic motor oils cause engines to leak oil?
Can AMSOIL motor oils be mixed with other brands?
What kind of base stocks does AMSOIL use? Are AMSOIL synthetic lubricants PAO-based?
Why are AMSOIL synthetic motor oils capable of extended drain intervals?
Will AMSOIL motor oils decrease oil consumption?
Is there a recommended procedure for changing to AMSOIL synthetic motor oil?
How do AMSOIL synthetic motor oils compare to other motor oils?
What are 'normal' and 'severe' driving conditions?
I am considering replacing the petroleum oil with AMSOIL synthetic motor oil in an engine that has 50,000 miles on it. I have heard that synthetics might clean the engine and cause plugging of the oil filter and passageways. Is this true?

Motor Oil: Gasoline Auto and Light Truck

Are synthetic AMSOIL motor oils 'all-season' oils?
Why are there multiple oils of the same viscosity?
What are the differences between AMSOIL OE Synthetic Motor Oil, XL Synthetic Motor Oil and Signature Series Synthetic Motor Oil?
Why isn’t AMSOIL Dominator® Synthetic Racing Oil recommended for street-driven vehicles?
What does the 'W' represent in 5W-30 motor oil?
What is considered 'normal' oil consumption?

Motor Oil: Heavy Duty & Off-Road Diesel

Is it safe to use Engine and Transmission Flush in diesel engines?
Can diesel oils be used in gasoline engines?
Can I switch from API CJ-4 or CI-4+ diesel oil to API CK-4 diesel oil?
Why are API FA-4 diesel oils not backward-compatible?
What is the difference between AMSOIL 5W-40 and 15W-40 diesel oil?
Can CI-4 rated oil be used in 2007 or newer diesel engines?

Motor Oil: Powersports and Small Engine

Is it safe to use 10W-30 in a small engine that calls for SAE 30 petroleum motor oil?
Can AMSOIL Formula 4-Stroke® 0W-40 Synthetic Motor Oil be used in new four-stroke snowmobiles?
Can AMSOIL Signature Series 0W-30 Synthetic Motor Oil be used in lawnmower applications?
Is it okay to break in new two-cycle equipment using AMSOIL synthetic motor oils?
What does 'wet clutch' mean when discussing power sports equipment?
Does AMSOIL have a two-stroke oil recommended for power valves?
Will using 100:1 mix ratios with AMSOIL Saber Professional or Saber Outboard Synthetic 2-Cycle Oil void warranties?
Can AMSOIL Formula 4-Stroke® 0W-40 Power Sports Synthetic Motor Oil be used in a four-stroke ATV or snowmobile where the recommended viscosity is 5W-50?

Motor Oil: Motorcycles

What AMSOIL motor oils are recommended for Harley-Davidson motorcycles?
What is the difference between Formula 4-Stroke® 10W-40 Synthetic Scooter Oil and 10W-40 Synthetic Motorcycle Oil?
What are the recommended AMSOIL transmission and primary chaincase lubricants for a Harley-Davidson Big Twin?
What is the recommended AMSOIL transmission and primary chaincase lubricant for a Harley-Davidson Sportster?
Are AMSOIL synthetic motorcycle oils wet-clutch compatible?
Is AMSOIL Synthetic Chaincase & Gear Oil (TCC) acceptable to use in the primary chaincase of a Harley-Davidson Big Twin?
How can AMSOIL recommend 20W-50 Synthetic Motorcycle Oil for use in the primary chaincases and transmissions of certain motorcycles?
What is the recommended AMSOIL lubricant for Victory and 2013 and newer Indian motorcycles?
What is the oil change interval for AMSOIL synthetic motorcycle oils?
Are AMSOIL synthetic motorcycle oils different from AMSOIL synthetic automotive oils?
Why does AMSOIL offer more than one viscosity motorcycle oil?

Transmission Fluids

What are the change intervals for AMSOIL Multi-Vehicle Synthetic Automatic Transmission Fluid and AMSOIL Fuel Efficient Synthetic Automatic Transmission Fluid?
Is it required that all of the transmission fluid be removed before adding AMSOIL synthetic transmission fluid?
Can AMSOIL Engine and Transmission Flush be used in all transmissions?
Does AMSOIL offer transmission fluid for manual transmissions? If so, what is the change interval?
Is AMSOIL Engine and Transmission Flush compatible with seals?
Is AMSOIL Multi-Vehicle Synthetic Automatic Transmission Fluid safe to use in Mercon® V and Mercon® applications?
Can an 'off-the-shelf,' singularly specified Ford Mercon® transmission fluid be used in a Mercon® V application?

Oil Filtration

What is the difference between a 'micron rating' and 'beta ratio test' when referring to filters?
Is it okay to use non-AMSOIL brand filters with AMSOIL lubricants?
What is the proper change interval for Ea® Bypass Filters?
Can a larger size filter be used in place of what a vehicle calls for?
How long can oil drains be extended when using a bypass filtration system?
What is the service life of AMSOIL Ea® Oil Filters?

Fuel Additives: Gasoline

Can multiple AMSOIL gasoline fuel additives be mixed together with gasoline?
What exactly does AMSOIL P.i.® gasoline fuel additive do?
Does AMSOIL offer any fuel additives that combat ethanol-related problems?
How often should AMSOIL Gasoline Stabilizer be used in powersports and small engine equipment?

Fuel Additives: Diesel

Does AMSOIL Diesel Injector Clean comply with ultra-low-sulfur diesel (ULSD) fuel requirements?
Does AMSOIL Diesel Cold Flow work if diesel fuel is beginning to gel?
What benefits are seen when using AMSOIL Cetane Boost?
What benefits are seen when using AMSOIL Diesel All-In-One?

Vehicle Warranty and AMSOIL

How does using AMSOIL synthetic motor oil affect new vehicle warranties?
Will extending oil change intervals void new vehicle warranties?
Does AMSOIL have a warranty for products?
Where should questions, regarding warranty, be directed?


Can AMSOIL products be stored in cold temperatures?
I see AMSOIL is registered to the ISO 9001:2008 standard and the ISO 14001:2004 standard. What does each mean and what are the differences?
Where can AMSOIL product recommendations, for equipment, be found?
How does AMSOIL packaging protect against product tampering?

Oil Analysis

What is oil analysis?
Why should oil analysis be done?
Does AMSOIL provide oil analysis services?

Maintenance Products

Is AMSOIL Propylene Glycol Antifreeze and Engine Coolant compatible with aluminum intakes, cylinder heads and engine blocks?
Does AMSOIL recommend a particular type of water when mixing AMSOIL Antifreeze and Engine Coolant?
Is AMSOIL Antifreeze and Engine Coolant silicate and borate free?

Gear Oils

Will GL-2 through GL-5 gear lubes hurt synchronizers?
Does AMSOIL Slip Lock need to be used with AMSOIL gear lubricants?
Can different AMSOIL gear lubricant viscosities be mixed?
If a vehicle manufacturer recommends a 75W-90 gear lube, may a 75W-140 be used?
Are AMSOIL gear lubes safe for yellow metals?
Is AMSOIL gear lube compatible with RTV sealant?
Can AMSOIL Severe Gear® be used in Harley-Davidson transmissions?
Is AMSOIL gear lube compatible with conventional gear lubricants?

API Licensing

What is API licensing for passenger cars?
Which companies license formulas with the API?
Is there any flexibility in manufacturing an API-licensed formula?
Why doesn’t AMSOIL license all of its synthetic motor oils?
How does AMSOIL INC. ensure that its products meet or exceed the minimum specifications of the tests required for API licensing?