Thread: oil filter by-pass valve

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  1. #1 oil filter by-pass valve 
    GT Level Member Madness's Avatar
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    With all the talk on here about oil filters, someone told me once that the the GM 3.8 in our cars has a by-pass valve built into the motor. Is this true?
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  2. #2 Re: oil filter by-pass valve 
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    I believe it's in the oil filter adapter. Other GM motors have it too. The oil filter companies realize this and don't include the valve in the filter.
    2006 Grand Prix GT S/C 109k - Modded Transgo Shift Kit, Gutted Airbox, Dash Cam, and Inlays. Retros soon to come.
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  3. #3 Re: oil filter by-pass valve 
    GT Level Member Madness's Avatar
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    thanks, that is what i was told
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  4. #4 Re: oil filter by-pass valve 
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    It is in the oil filter adapter housing. As far as I know just about every engine has one
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  5. #5 Re: oil filter by-pass valve 
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    Just an FYI....Ford doesn't have a bypass valve built into the houseing like GM's; the bypass valve is actually built into the bottom of the filter.
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  6. #6 Re: oil filter by-pass valve 
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    Right. Some engines do, some don't. The bypass valve in the filter can be located at the bottom, but the better design is to have it at the top so in a bypass situation, sludge or particle-up at the bottom of the filter doesn't get bypassed. Green part.

    2006 Grand Prix GT S/C 109k - Modded Transgo Shift Kit, Gutted Airbox, Dash Cam, and Inlays. Retros soon to come.
    2002 Grand Prix GT N/A 127k - Same as 06 Plus: Trans Cooler, DIY Aux Input, LED lighting, Suspension Upgrades, Tint, Retrofits.
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