AMSOIL Dual-Gard
By-Pass System
(BMK-12)

Why should you use an AMSOIL Dual-Gard By-Pass System?

Absolute Protection from Engine Dirt 

Assurance of Analytically Clean Oil

WHY ANOTHER FILTER?  Even the best full flow-filter can't do it all.

Your full flow filter must allow oil to pass through it quickly to keep the engine from starving for oil. Because of this they can only filter out wear particles down to the 20-25 micron range (a human hair is 100 microns). Their relief valves open when the engines demand for lubrication can't be ignored, allowing dirty unfiltered oil to circulate in your engine.

A study completed by Federal Mogul Corp. analyzing over 7000 main and connecting rod bearings concluded that 60% of all engine wear occurs in the 5-20 micron range. 

These microscopic particles closely match the precision clearances between critical engine components such as bearings and rings.

This is why no matter how much you change your current oil and filter, you still are not removing the particles that cause the greatest wear in your engine.

Automobile engines are also susceptible to water formation damage, either from blowby or condensation. This produces corrosive acids that attack the engine, contributing to further friction, wear, debris, and oil degradation.

The AMSOIL Solution-  By-Pass Filtration

Unlike a full-flow filter, the AMSOIL By-Pass Filter is situated outside of the main line of oil circulation; it taps into the line to bleed off and clean only a portion of the oil at a time. 

You still need a full-flow filter, of course, because oil must circulate continuously. But with an AMSOIL By-Pass Filter drawing 10% of your system's capacity, all the oil in a six-quart system will be filtered to analytical purity in about  five minutes, at an average engine speed equivalent to 45 mph.

All dirt particles down to 1/10 of a micron are trapped, and the medium's thirsty cellulose fibers can remove up to a pint of water. 

The AMSOIL Dual-Gard By-Pass System (BMK-12)

This system is used primarily on engines with a sump capacity of 15 quarts or greater. These are usually your large diesel engines.

The mount and filters can be installed in any accessible area.

Remote placement of the filtration unit allows larger by-pass oil filters to be used which increases sump capacity - dramatically extending the oil's useful service life and protecting your wise investment in AMSOIL Synthetic Motor Oil. 

You tap into a pressure port on your engine for the oil supply. The filtered oil will be returned to a tapped fitting in your oil pan, a non-pressure port on the engine, dip stick tube fitting, etc.

By using oil analysis, the typical replacement interval for the AMSOIL By-Pass Oil Filters is 30,000 to 35,000 miles. Every situation is different, so you must establish your own replacement interval.

You must still use your full flow filter changed at established maintenance intervals.

Once your AMSOIL Dual-Gard By-Pass Filter System is installed, you could quite possibly go 100,000 miles or more on one oil change using oil analysis. 

Oil analysis testing is common practice with commercial, fleets and heavy-diesel equipment.

Read how one owner/operator went 409,000 miles on one oil change using the AMSOIL Dual-Gard By-Pass system.

Which one do I order? Use this By-Pass system selection guide.

Which by-pass filter? Use this By-Pass filter selection guide to pick.