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Bypass Oil Filters

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Guest Mopar1973Man

Sorry I don't have one on my truck... But from all the reading I done on bypass filters they are a good addition to any truck... But from what I understand they are quite costly...

Maybe someone else will have some information here...

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The Oilguard/Racor filter is supposed to be very good. Any properly set-up system should be better than none. I've heard bad things about Amsoil's dual bypass, but the single is supposed to work well. If you don't want to spend alot of money you should be able to piece together a system with parts from NAPA for less than $100. I haven't looked into it for awhile so my price figure might be a little off.

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I bought the Amsoil single bypass. I am looking forward to putting it on. In fact, Duluth Diesel helped me out alot!

If you want the part numbers, PM me.

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What have you heard bad about the dual bypass system, KRP?

-Chuck

I've heard that they don't flow enough oil and can starve the engine. The single is fine because it doesn't move the stock filter.

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That's actually not true, the full flow AMSOIL bypass oil filter on the bypass mount flows just as well as the full flow mounted on the engine. There is no difference in oil supply available to the engine between the single and dual mount bypass systems. The only oil pressue that does arise with the newer (2004+ Dodges) is that they have a more sensitive oil pressure sensor unit. The sensors have always been in the same spot, but the software on the newer truck's ECMs throws a code when it perceives a delay in oil pressure at startup. The oil pressure and supple to the engine are identical in an engine with and an engine without the bypass system, but due to the larger holding capacity of the dual mount bypass system, and due to the oil pressure sending unit being affected by the returning oil, there is just enough of a delay in flow through the bypass system to upset the oil pressure sensor. During this 1/2 second at startup, the only part of the oil system not at pressure is the full flow filter, but the bypass filter, and not the engine. During startup, oil supply and pressure in the engine is actually the same as stock. It is just how the sensor, with updated more sensitive software, and the location along the return supply are lined up, that this 1/2 second perceived delay throws a code. That's why AMSOIL recommends the single bypass mount for the newer trucks. It is harder to hook up, but doesn't upset the sensor.

So, in actuality, there is NO issue with oil pressure or starvation with a dual bypass system. It is a sensor being more reactive than in older models. The AMSOIL system is very tried and true. They have been doing bypass filtration in cars and light trucks longer than anyone.

-Chuck

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I went back and did some re-reading on the subject. I am assuming that you are an Amsoil dealer, if so does Amsoil no longer recommend the use of the dual bypass on the PSD? The PSD PCM doesn't monitor oil pressure so setting a code isn't an issue with it. I realize the application here is a Cummins, but restriction is restriction and not something I would want on any engine.

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hey duluth, what does one of those full flow systems cost? I'd like to look into one to make my oil changes less of a hassle and take some of the soot out of my oil, I really don't like having to take my twins apart to change my filter.

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