Good morning!
Using fully synthetic oils for your non-CRDi diesel engine will be just an added cost. itim na yan the next day dahil madumi ang diesel dito sa pilipinas. It is still better to change the oils for such engines (tulad ng 4D56 ng advie) every 5000 km, rather than the 10,000 km promised by synthetic oils, since the engine will be "washed" more often.
Personally I use mineral oils. no problems so far.





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