Rugby Union Strength to Perform

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^*In a test of the oil’s strength across a variety of engine speeds, the Castrol EDGE range average metal to metal contact is 40% lower than a leading competitor.
^We asked a third party laboratory to test the Castrol EDGE range using our Maximum Endurance Test and on this test Castrol EDGE was proven to be on average 35% stronger for longer compared to a competitor brand from another major lubricant supplier.