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The FSM for 1994 says 10W-30 is preferable and doesn't even put the 20W oils on the chart like the earlier models. I haven't heard of any tolerance changes in the earlier years? I assume it is because of the improvement to oil manufacturing and higher standards for oils. Due to that, all I use is a quality 10W-30, that meets the current API standard, this is for street use btw.
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