Begin with checking the oil level is the reservoir, it should have a dip-stick on the bottom of the fill cap. If not, fill to ½-3/4 inch below the top with slide retracted.
This might come in handy:
https://www.hwhcorp.com/ml17785_01_nom_pr_so.html
The first step is to accurately identify your slide, it will either be type A or B, then drill-down to your exact model # and follow the path.
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2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA 1SG, retired;PPA,Good Sam Life member,FMCA.
"We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert the Constitution." Abraham Lincoln