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Message: <blockquote data-quote="astroboy" data-source="post: 450127" data-attributes="member: 4527">1. +1L engine oil top up for N52 engine in the E9x and E6x is pretty common at an interval of 6k ~ 8k km.2. The engine is better off to have sufficient oil than 1L short.3. Try not to stretch engine oil use to above 10k km.4. If the +1L comes up at 8k km, then it make more sense to replace the oil than topping it up and drive another 2k km. If at 6k km, then just top up and use another 4k km lor.5. Best is to top up with the same grade and brand oil if you want to be particular. For me, any fully synthetic of the same viscosity would do for top up.</blockquote>