AMSOIL's bypass filter system for a Ford 7.3L PowerStroke Diesel can be handled in either of two ways. We have a Dual Remote mount that is set up to bolt by way of a special plate to the filter mount on the engine block with a dual filter mount remotely mounted elsewhere. This may be under the hood on a fender or firewall location, or I've seen them mounted on the frame rail under the cab or even under the pickup bed. This system will increase the amount of oil dependent on the length of the hoses. The remote mount contains both the full flow filter which is rated with a beta of 17-20 microns, and the bypass filter rated with a beta of 3 microns (beta is the smallest particle size removed at a rate of 98% efficient in one pass). The full flow filter, typically an ASF-26, and a by-pass filter, usually a BE-100 (9"), provides plenty of filtration. If room permits, a BE-110 (12") bypass filter may be used. The larger filter is rated the same quality filtration, but has more capacity to hold dirt.

The other way to mount our bypass filter involves placing a T-fitting at the oil sending unit, routing a hose to a single by-pass filter mount, and then a return line to the valve cover, upper oil pan, or other means of returning the oil to the sump. This system is a little more complicated, but works well if you really are lacking in space and want the by-pass filter mounted under the hood or if you want to not mess with the existing full flow filter. Either way is equally effective in filtering the oil.

You really don't need to get involved in a dual bypass filtration system until you get in over the 18 quart sump capacity. The Dual Gard system incorporates two BE-100 filters over 18 quarts, and two BE-110 filters over 30 quarts. Two BE-90 filters can be used in the 14 to 18 quart range, but it is more economical to just go with a single but larger bypass unit.

Typically, all the oil will be filtered about every 10-20 minutes. You are only filtering 1-2 quarts per minute. Sometimes, especially with the installations that take oil out at the oil sending unit, you will see a 3-4 pound decrease in oil pressure. This is because the oil sending unit is deprived of oil pressure, not the engine.

The by-pass filter will last at least twice as long as the full flow filter. If you are using our full flow filter, it is recommended to be changed at 7,500 miles or 6-months, therefore the by-pass filter would be changed at 15,000 miles or one year. You can use any full flow filter, but you must change that filter at that manufacturer's recommended interval, which is usually shorter than ours. I, and many of my customers, start to monitor the bypass filter at about 15,000 miles. If it gets hot, it's working. When it no longer gets hot, it's time to change it. After all, it is supplemental filtering, and when it gets stuffed up completely to the point where oil will not circulate (as it is a by-pass filter, there is no need for a by-pass valve as there is in a full flow filter) then it is time to change the filter. You're not hurting anything as you are just back to using the filter that came with the engine!

With the bypass filter being rated at 3 microns, it will remove contaminants down to a point where contaminants, including soot, metals, etc., that remain are actually smaller than the engine's finest tolerances, greatly reducing wear. We do not recommend any after-market oil additives with AMSOIL 100% Synthetic Motor Oils, but if the type that has Teflon is added, this filter will typically filter them out anyhow!

Keep in mind that there are contaminants that are too small for even this filter to remove, so your engine oil will still get dark, but with the use of oil analysis, which I strongly recommend for all diesel engines, you will be able to monitor the wear patterns, additive levels, viscosity, and other contaminants including water, fuel, and antifreeze. With a trend line over a period of time, you will see how the oil stands up and lasts longer. Utilizing AMSOIL 100% Synthetic Oil, I have seen over-the-road truckers go 100,000+ miles without an oil change. Some much further.

We definitely do not recommend this, however, without the use of oil analysis. But if the analysis shows the oil still meets manufacturer's recommendations for new oil, why change it???

As for your question on fuel filters, AMSOIL does not make any fuel filters. We do distribute fuel filters produced by Hastings. Filter sizes and part numbers can be determined by using the Filter Look Up Pages and can be ordered on-line.

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