Sludge Horror Show

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makes me wonder if we should drop the pan on my brother's 98 Mustang. when we pulled it out of the garage last year,(for the first time in 2-3 years) it only had 14,500 mi.
we then changed the oil for the first time in about 6 years, took out some jobber filter, and god knows what 5w30, replaced with Motorcraft filter, 5 qts Motorcraft 5w30, and .5 qt supertech 5w30

he already had to drop the gas tank, and replace the varnished up fuel pump(never used any additives, sta-bil or otherwise)
 
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When I worked at an oil change place in college, I reluctantly changed oil on a 4.9L Ford F-150 that had never had an oil change in 40,000 miles. By this time I was the "top tech" (LOL) and was told to do it after protesting that we shouldn't touch this thing out of liability issues. The OEM factory gray filter was nearly rusted through, but came off surprisingly easy. The oil (which the idiot was at least sensible enough to check and add too) came out like jet black cottage cheese however. Never saw the guy again, but I can see the look on his face to this day after he realized we were harshly mocking him.

I suspect this is however a testament as to how great that old Ford straight-six was...
 
I don't think it was a "horror" or "shocking" either. Anything sitting with 50 year old oil absorbing condensation is going to form sludge like that. I'm guessing the last change that car received was a non-detergent SAE30 at best!
 
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Just.....
I don't even know
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I need to go sit in a corner and cry now
This changes everything
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Blackstone UOA just got back.

We expected some excess silicon, and boy did we find some!!! However, we examined the sample itself, and it did have a gritty feel. There was a lot of debris that settled to the bottom of the bottle. It's possible dirt got into the engine and it's just too big for our machine to see. The high wear could show abrasive contamination. Universal averages show typical wear levels for this type of engine after about six million miles on the oil. FUEL DILUTION is at a EXTREME LEVEL. There was also some moisture in the sample, perhaps snow? The TBN is very low at 0.03. Run 3,000 miles and check back on wear.
 
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