Is oil dye long term an issue?
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1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, Is oil dye long term an issue? in Past Cadillac Vehicle Discussion; I have a leak .. somewhere (I think toward the back, but I'm not sure) - so I wanted to ...
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    naif is offline Cadillac Owners Connoisseur
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    Is oil dye long term an issue?

    I have a leak .. somewhere (I think toward the back, but I'm not sure) - so I wanted to put in some dye so that I can track it better. However I'm not due for an oil change for quite a while (85%+ OLM), would leaving the dye in for a few thousand miles be a problem, or should I do it toward the end of the oil change interval?

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    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: Is oil dye long term an issue?

    There's no harm in leaving dye in the oil - but there's no sense in doing that: Dye (ultraviolet reaction) is intended to be used in a CLEAN engine environment - the engine is thoroughly cleaned of all oil/dirt, the dye is installed, the engine is run for a few warm hours, then UV light is used to find the leak/weep point(s). If you pour in dye and let the leak wet down old oil residue the location of the leak is far less obvious.

    Oil leak detection is not simply "pour it in and there it is" - it's a specialized test procedure.

    EDIT at 0955: Just did some snooping. Google "engine oil leak tracer dye".

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    naif is offline Cadillac Owners Connoisseur
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    Re: Is oil dye long term an issue?

    Yes, I understand that I have to clean the engine first, otherwise it's not nearly as helpful.

    Thinking about it, though, it's probably not the back. I saw the smoke come off the back, but that's likely because I had it on ramps (to change the coolant)...

    The oil sender is wet but that's not necessarily indicative of anything - could be coming off the half case.

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    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: Is oil dye long term an issue?

    If you're of a mind, remove the lower air deflector and the oil filter adapter. Replace the O-rings and pressure sending switch. Both of those tend to develop weeps over time and at least it's a warm, fuzzy feeling job.

    (Later Northstars use a one-piece oil filter adapter mounting gasket/seal.)

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