mitsubishi adventure 4d56 engine.TOP1 fully synthetic diesel engine oil

i used TOP1 fully synthetic diesel engine oil for my mitsubishi adventure 4d56 model 2000.
my engine runs very smooth and top1 oil adds life to prolong the span of changing the oil....maybe at least additional 40 percent ....
7000 kilometers before the oil change....

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Bossing, bakit 5 litro lang? D ba 5.5 liters langis ng adventure.