WARNING TM 10-3930-643-10 2-20. OPERATING     PROCEDURES.-Continued b. Starting     Aids. (1)    Winter    oils. To     determine     the     oil     for     winter     use,     refer     to     LUBRI- CATION    SPECIFICATIONS    in    the    LUBE    ORDER.    Use    the    recommended    weight    oil    for the    temperature    range    indicated.    For    other    than    temperatures    shown,    see    your supervisor    or    organizational    maintenance. Refer    to    LO    10-3930-643-12. (2)    Ether    starting    aid. TOXIC/FLAMMABLE Ether    is    toxic    and    flammable.    Use    only    in    well ventilated    areas.    Avoid    contact    with    eyes,    skin    and clothes.    Do    not    use    ether    or    discard    ether    container near    an    open    flame,    sparks    or    heat.    Failure    to    follow these    instructions    could    result    in    SEVERE    INJURY.    If injured     seek     medical     attention     immediately. Excessive    use    of    ether    will    cause    piston    and    ring In    extreame    cold,    if    engine    fails    to    start    after    30 seconds    of    cranking,    it    may    be    necessary    to    repeat    this procedure.    Wait    two    or    three    minutes    to    allow    starting motor    to    cool    before    starting    again.    S/N    2001    and    above lever    type    starting    switch,    must    be    returned    to    the    OFF position    before    repeating    this    procedure.    If    engine fails    to    start    after    second    ether    injection,    refer    to paragraph 3-5, troubleshooting     and/or     organizational maintenance,    as    required. (3)    Slave    starting    the    engine. Contact     organizational     maintenance if    required. 2-34