AMSOIL Synthetic Lubricants are designed and engineered for extended drain interval service. The color the AMSOIL on your dipstick (or ANY oil for that matter) has absolutely no bearing on whether or not the oil is suitable for continued use or if it should be drained and replaced. Use the recommended change intervals for both the oil and engine oil filters as specified by AMSOIL.

It is a common misconception that an oil's color is an indication of how dirty it is. This is absolutely NOT TRUE. The color of an oil does not have any bearing on its lubrication ability. Most oil and especially diesel engine oil will turn black in the first few hours of operation due to contaminates generated by the combustion process and soot particles. The ONLY way to accurately determine an oil's lubricating value or contamination level is through (spectrographic) oil analysis. Oil analysis is common practice used regularly in commercial, industrial and fleet operations and can also be used for passenger cars, light trucks or any other application. In addition oil analysis will also determine the exact parts per million (ppm) of wear metals in your oil which provides an indication of any abnormal wear or specific components that need mechanical inspection in addition to checking for any fuel, water or glycol contamination. *At the end of this section you will find a listing of what oil analysis testing checks for.

The useful life of an engine oil is dependent on several factors such as the quality of the oil, type of fuel, equipment condition, type and operating environment of the equipment and, most important, the type of filtration used. The filtration system and the oil are vital tools for preserving engine life. A highly efficient filter is essential to protect an engine by removing both liquid abrasive contaminants held in suspension by a high quality premium oil such as AMSOIL. When using AMSOIL Synthetic Lubricants for extended drain intervals the AMSOIL Super Duty Filter (SDF) must be changed at 12,500 miles or 6 months for gas engines and 10,000 miles or 6 months for diesel engines, such as the Ford Powerstroke or Dodge Cummins.

If the AMSOIL Dual-Gard or Dual-Remote By-Pass Filtration Systems are used then the AMSOIL Super Duty full flow engine oil filter must be changed at the same intervals as specified above and the by-pass filter(s) changed as indicated by oil analysis results. The oil does not need to be changed when using by-pass filtration unless oil analysis testing indicates it is necessary.

It is not uncommon to get several hundred thousand or more miles on the AMSOIL when using dual by-pass filtration. A Mack Dealership recently performed a teardown inspection on a 1990 Mack E7-400 diesel engine with 630,000 miles total and 409,000 miles without an oil change and its parts were examined by an engine rater from a major oil additive raw materials manufacturer and supplier. The engine showed light to moderate wear throughout, just as an engine in similar service and lubricated with conventional oil changed at 15,000-20,000- mile intervals (as is common with over-the-road semi-trucks) would show. In fact, according to the engine rater the parts examined- cylinder liners, pistons, rings, bearings, valve train components- could have been put right back in the engine and would have continued to provide the good, dependable service they had provided all along- after 409,000 miles without an oil change! If you would like the full detailed report and photographs of this teardown inspection please click here.

• -sample #, date sampled, date tested, unit #, engine make, model, year, oil brand, viscosity grade, sump capacity, make up oil added, type of filtration, last filter change
• - component miles, oil miles, last oil change miles
• - % presence of gylcol, water, fuel
• - viscosity @40 deg. C. and at 100 deg. C.
• - % solids
• - soot, oxidation %, NOX %, TBN, TAN
• - % iron, chromium, lead, copper, tin, aluminum, nickel, silver, manganese, silicon, boron, sodium, magnesium, calcium, barium, phosphorous, zinc, molybdenum, titanium, vanadium and cadmium
• - recommendations and additional test results

If you are looking to make a purchase or wanting to become a dealer, please click the icon below. Amsoil products are primarily sold through catalog ordering. It's only $30 per year to become a dealer. If you wish to order at wholesale (25% less than the prices seen in the catalog), you can become a dealer or preferred customer to get the wholesale costs. The only way to get free shipping is to own a retail establishment and place an order exceeding $8,000. Otherwise if you live within a reasonable distance from one of the 14 warehouses in North America, you can drive in person. Shipping costs are so insignificant that it's often not worth the trouble to go to any warehouse. Since Amsoil has such a large account with UPS, they get a tremendous discount on shipping and pass it down to all of the customers.