Perkins — To help prevent excessive engine wear and corrosion
A Perkins service procedure — check it applies to your exact model before use.
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Procedure
- Completely clean the outside of the engine.
- Ensure that the vehicle is on level ground.
- Drain the fuel system completely and refill
Source: manual:Perkins Operation and Maintenance Manual 1106D Industrial Engine.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.