Oil Filter Analysis
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HT4100 4.1, 4.5, 4.9 Discussion, Oil Filter Analysis in Cadillac Engine Technical Discussion; Anyone experienced with companies that do oil-filter analysis? I'd like to get a report on what 2 filters have trapped ...
  1. #1
    Dave S Texas's Avatar
    Dave S Texas is offline Cadillac Owners Enthusiast
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    Oil Filter Analysis

    Anyone experienced with companies that do oil-filter analysis? I'd like to get a report on what 2 filters have trapped inside. One is a 300 mile use filter from new engine and the second will be a 3000 mile use filter. I know there are a number of companies that do this analysis, but I've not done this before. Looking for recommendations. Thanks

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  3. #2
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: Oil Filter Analysis

    DIY - Using a vise to hold the filter, carefully hacksaw around the crimp at the tapping plate and pull the media out. Using a box knife, cut the media pleats away from the end caps. Break the media into sections of 10 - 12 pleats and (rags underneath) squeeze each accordion dry in the vise. Open the pleats and flatten, disregarding any paint or metal chips at the end you sawed off. Remember that oil flows through the media from the case side to the center tube, so contaminants will be trapped in the outside diameter of the media.

    Aluminum chips or shavings will be bright silver, iron will be darker steel metallic, cylinder wall material - iron from ring breakin - will be silvery gray dust and bits and pieces of gasket and sealer will be various colors. The media should, on a 7,500 mile filter, be a uniform dark brown/amber color.

    Look at these - http://minimopar.knizefamily.net/oilfilters/index.html and http://minimopar.knizefamily.net/oil.../opinions.html

    I can guarantee that, in the 300 mile filter, you will find some aluminum flecks, some plain old black grit from the oil passages, and maybe some bits and pieces of excess gasket sealers. In the 3,000 mile filter, practically nothing except media discoloration. Both completely normal.

  4. #3
    steelybill is offline Cadillac Owners Enthusiast
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    Re: Oil Filter Analysis

    I use a filter cutter to open them. I have to use it on airplanes, so it's handy to check other filters. Carbon particles are what I usually find in a normal higher mileage engine. Metal can be bad news, and I use a magnet to catch the steel debris. Aluminum Particles can be seen OK with a magnifier if not with the naked eye.
    Submariner 409 did a good description of what's possibly in there.

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