Opti-2 oil ok for the Sthil 4 mix?

Discussion in 'Mechanic and Repair' started by Jason Rose, Mar 23, 2007.

  1. Jason Rose

    Jason Rose LawnSite Fanatic
    Messages: 5,858

    Just wondering if it's really ok to use the opti-2 oil in the 4 mix engines? Just got a new FC95 edger a week and a half ago, and for the last many years Iv'e been a strong believer in the Opti-2 oil, BUT is it good enough (enough oil ratio) for the 4 mixers?
  2. Jay74

    Jay74 LawnSite Member
    Messages: 57

    I would use Stihl's Ultra or High performance oils only. I have had to decarbon to many 4-mix engines from using other oils.

  3. Jason Rose

    Jason Rose LawnSite Fanatic
    Messages: 5,858

    Well that's no good... I use several brands of 2 stroke equipment and love having one can of mix on the trailer for everything... I *think* that about everthing I have runs 50:1 though. Maybe Sthil oil would work best for everything? Maybe use Opti, only mix it richer?
  4. Jason Rose

    Jason Rose LawnSite Fanatic
    Messages: 5,858

    man, i need to change my name to Katie or something... I get no responses here! (Ok, one, thanks Jay74)
  5. MowerMedic77

    MowerMedic77 LawnSite Bronze Member
    Messages: 1,164

    Well Katie Rose :laugh: JK I would use the oil recommended by Jay, the Sthil four mix units seem to be having lots of issues, even the Sthil dealer in my area does not like selling them. It's a major PITA but you may want to have a small fuel can just for the 4-mix.
  6. JTF40

    JTF40 LawnSite Senior Member
    Messages: 875

    Opti2 is BY FAR the best 2cycle oil I have EVER used. :usflag:
  7. lawnboy dan

    lawnboy dan LawnSite Gold Member
    Messages: 3,711

    i am trying the sthil ultra hp oil in my br600 now. will report results

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