Delo siver can be considered semi synthetic as it has group III oil blended in with it. and it has greater than 1000ppm zinc so that's a good thing. If it's anything like the Delo 400 it probably has a good dose of moly and boron in it as well. Delo oils are for commercial vehicle use so they are stout.l
Yes, this is what we use in our fleet since they change oil every 3 mos regardless of travel (I est however that they travel around 4,000kms) It is quite cheap for maintenance of a fleet of forward Isuzu's with 16ltrs engine oil capacity..
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