Synthetic vs Semi Synthetic oils

Discussion in 'Engine' started by rikana, Apr 28, 2011.

  1. rikana

    rikana New Member

    Apr 13, 2011
    s320 w140
    My car is a 98 W140 S320L. I was just at the dealer who has been servicing it and they have service packages where they do lube changes for minor service. When I asked them what lube they use they said either Total quartz 7000 or 9000. The difffrence being one is semi synthetic. I would like my car to be on fully synthetic oil. However, i have heard of people having leak issues when they change. So what is the real diffrence and are there any risks o my using fully synthetic oil??
  2. lupi

    lupi Active Member

    Mar 23, 2011
    W124 200D,W211 320 CDI SPORT, Aston Martin Vanquish S,Land Rover Discovery, BMW E32 750i.
    The real difference is in the name itself, semi or fully.
    The fully is better, for longer change intervals, i.e. more
    miles and not time periods, it is also better for high speed,
    and more over the viscosity range is more then semi.

    What oil have you being using before and have you had any trouble ?

    Dealer should know exactly what oil your engine needs, and in your case I would leave it to them.
    There is no leak issue between semi or fully, in rare cases it rather could
    be an issue of viscosity.

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