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Toyota Sludging

I've read for the last year or two about some consumers having sludging problems; I recently found the answer for one of my friends with a 1998 Toyota 3.4L Tacoma - he didn't think changing his PCV valve was really that important. We helped him in getting his oil analyzed and found the oil to be two grades out of spec; far from sludge but on it's way (from a 30W weight to a 50W ) at 100 degrees C. We changed the PCV valve, changed the oil / filter and will resample at next interval; that will be a while so stay tuned.

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