[quote]ORIGINAL: pococj

I use an Amsoil By-pass filter on my 2004 FX4 F-150 and I recently sent in a sample to Blackstone labs and their test results after 10,000 mile said the oil was fine and "this was one of the cleanest 5.4 lt Ford engiines they had seen. I don't have to change the oil at all but I do once a year anyway. I have an article of a by-pass filter on a Harley. E-mail me if you are interested. Go to this link. It is a 1995 Harley Davidson FLHT Electra Glide
AMSOIL Dual Remote By-Pass Filter System


http://amsoil.com/bypassfilters/vansise/index.htm


NC Brew

 

Hmmmm, I have a copy of Amsoil's catalog and even there own catalog states to use 20w50 in a sportster tranny.


LV

 

Hey Pococj,I also read the AIM article on the oil filter's and when I questioned the service manager at the dealer they said the evo filter's did not require a anti drain back valve,I think that's right or have I got it backward's.Any way one is the opposite of the other.

 

Looking in my manual, it shows the filter in the return line to the tank. That would indicate to me that an anti-drain back valve shouldn't be needed.

Isn't the Twinkie filter in the supply line?

 

LV,

I tried to get hold of someone in York, but they are all gone until the New Year. What I did do was call 3 dealerships, and asked to talk to the head mech in each one.

All of them said the same thing, and that was, "if it's motorcycle oil and motrocycle filter, you're good."

Case closed in my book. I'm going fully synthetic at the first opportunity, (I live in a HOT desert), and that's what came from the factory in one of my cars. I will spend a little time reading up on the sites the Pococj gave us and then deside on the filter. I'm thinking the Mobile 1 filter or the filter you got are in the top two of my choices.

This was a really informative thread...

Mac

 

Glad I could help

 

I dont know if the evo filter is in the return or suction side But ask yourself this. Do you Really Want Dirty Oil and Possibly Metal Particles Falling back into your oil system!! They belong in the Filter and once I turn my engine off I dont want Anything Falling from the filter back into Any Part of the oil system.

 

The filter on an Evo is in the return line to the tank. Even if the thing doesn't have an anti drain back valve the any crud in the tank can't flow back through the filter into your engine. There needs to be a sufficient pressure differential to push the oil through the filter, and with the engine shut down all you have is the height of oil in the tank and line, say 12 inches pushing against the filter and the oil in the line on the inlet side of the filter. There isn't enough pressure in that situation to allow the oil to drain from you tank back into the engine. Plus the return line in the tank is generally above or at least near the top of the oil level.

Bottom line on Evo: Drainback valve not necessary.

Twinkie motor: IIRC, the filter is in the supply line, and so needs an anti drainback valve.

 

Skip, you're an endless supply of knowledge. Thanks for sharing. I'm learning so much.