When changing oil on any machine with an external spin on oil filter (see photo below) it is important to inspect the old oil filter and see if the rubber o-ring is still connected to filter. In some cases the o-ring off the filter will stick to the unit. If the filter is re-installed with out removing the o-ring it can cause an improper seal and allow oil to leak. If this goes unnoticed it can allow the unit to lose enough oil to cause engine damage or even complete motor failure. Yikes.
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