Cadillac 2006 STS User Manual download pdf (Page 319)

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To help keep fuel injectors and intake valves clean, or if

your vehicle experiences problems due to dirty

injectors or valves, look for gasoline that is advertised

as TOP TIER Detergent Gasoline. Also, your GM dealer

has additives that will help correct and prevent most

deposit-related problems.

Gasolines containing oxygenates, such as ethers and

ethanol, and reformulated gasolines may be available in

your area. General Motors recommends that you use

these gasolines if they comply with the speciﬁcations

described earlier. However, E85 (85% ethanol)

and other fuels containing more than 10% ethanol must

not be used in vehicles that were not designed for

those fuels.

Notice: Your vehicle was not designed for fuel that

contains methanol. Do not use fuel containing

methanol. It can corrode metal parts in your fuel

system and also damage the plastic and rubber

parts. That damage would not be covered under

your warranty.

Some gasolines that are not reformulated for low

emissions may contain an octane-enhancing additive

called methylcyclopentadienyl manganese tricarbonyl

(MMT); ask the attendant where you buy gasoline

whether the fuel contains MMT. General Motors

recommends against the use of such gasolines. Fuels

containing MMT can reduce the life of spark plugs and

the performance of the emission control system may be

affected. The malfunction indicator lamp may turn on. If

this occurs, return to your authorized GM dealer for

service.

Fuels in Foreign Countries

If you plan on driving in another country outside the

United States or Canada, the proper fuel may be hard

to ﬁnd. Never use leaded gasoline or any other fuel

not recommended in the previous text on fuel. Costly

repairs caused by use of improper fuel would not

be covered by your warranty.

To check the fuel availability, ask an auto club, or

contact a major oil company that does business in the

country where you will be driving.

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Cadillac 2006 STS User Manual Page 319

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