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Many threads on this and many different opinions scattered throughout this board. I switched right before 100k to synthetic b/c I don't drive more than 10k miles a year and wanted to do preventative maintenance once a year.
I'm about five months into this and will let you know by the end of the year if I've had any issues. So far, so good.
BTW, I also swapped synthetic into the auto tranny and diffs.
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Edwin
1999 SR5 4unner
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