GMC 2000 Sonoma Owner's Manual page 247

NOTICE:
Your vehicle was not designed for fuel that
contains methanol. Don't use it. It can corrode
metal parts in your fuel system and also damage
plastic and rubber parts. That damage wouldn't
be covered under your warranty.
Fuel E 85 (85% Ethanol)
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The 8th digit of your vehicle identification number
(VIN) shows the code letter for your engine. You will
find the VIN at the top left of your instrument panel.
(See "Vehicle Identification Number" in the Index.)
If you have the 2200 L4 (Code 5) engine, you may
use either regular unleaded gasoline or ethanol fuel
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up to 85% (E 85); also see "Fuel (Gasoline)" listed
previously. If you have the 2200 L4 (Code 4) engine
or the 4.3L V6 engine use only regular gasoline.
Only vehicles with the 2200 L4 (Code 5) engine may
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use 85% ethanol fuel (E 85).
Most service stations will not have an 85% ethanol fuel
-
(E 85) pump available. Those stations that do have E
should have a label indicating minimum ethanol content.
Do not use the fuel if the minimum ethanol content is
greater than 85%. Your vehicle may not operate
properly if the ethanol content is greater than 85%.
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At a minimum, E 85 should meet ASTM
D 5798 specifications.
To insure quick starts in the wintertime, the E
must be formulated properly for your climate according
to ASTM specification D 5798. If you have trouble
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starting on E 85, it may be because your E
is not properly formulated for your climate. If this
happens, switching to gasoline or adding gasoline to
your fuel tank may improve starting. Mixing gasoline
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and E 85 in your fuel tank will not cause any
problems with your vehicle. For good starting and
heater efficiency below 32 _ F (0 _ C), the fuel mix
in the fuel tank should contain a maximum of
50% ethanol.
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85
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85 fuel
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85 fuel
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