danio,
when you put in your VLSD or had it put it in did anyone refill it?
If so yes it needs LSD specific oil or the LSD additive with the stock gear oil. Yes it is a J30 VSLD <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/biggrin.gif" border="0" valign="absmiddle" alt='
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also it would not hurt to drain it and refill it with the right stuff to be safe.
Dave