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    Shell Helix Ultra 5W-40 in Mercedes OM 647 Engine

    I am new to this forum. I drive a 2004 Jeep GC 2.7 with the Mercedes OM647 fitted. The dealer used Shell Helix Ultra 5W-30AB but this oil is not available in South Africa anymore. The vehicle has completed 100,000 kms (60,000 miles). Will I be safe to move to Shell Helix Ultra 5W-40 or even...
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