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OIL SERVICING II In a mixed fleet checking what grade
Page 36
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oil to use can be time-consuming. Multigrade oils are designed to make life easier, but what are the risks? "An engine working at close to maximum output is highly stressed so needs the protection of a high-performance oil. Lightly loaded engines can cope with lower grade oils," says Shell's Ashley Proctor. "You need to check the engine maker's recommendations and it depends on your operation, but many of our customers find they can save money by using a lower-grade oil throughout the fleet by shortening the oil-change interval on the higher-specification engine. The short oil changes mean the oil will not degrade to the extent where it will harm the engine."
Proctor also warns that operators who introduced a new high-performance oil might experience higher oil consumption temporarily. That is caused by the new oil cleaning up deposits in the piston and ring areas.