Quartz 9000 is a good oil. But Liqui Moly variants are better.
The price reciprocates the change interval.
Quartz 9000 is good enough for 5000 - 7500 km.
Liqui Moly is good enough for 10,000 - 12,000 km.
Hardly difference of a Re if you calculate the running cost / km.
However, it's all about personal preferences
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