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Engine oil W221 S350L V6 CGI Blue Efficiency


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Hi Good Day !!  I was offered to use Mobil-1 5W50 FS X1 (Excellent Wear Protection - Rally Formula) and further top up with Liqui Moly Ceratec for smoothness and power. Currently, using Shell ultra helix 5w40 , clocked 156kkms. However, it feels sluggish during pick up 20 to 50km range. Workshop recommends I switch to above 5W50 and top up. Welcome any insight on its effectiveness or experiences in this matter.


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