CAN I PUT THE LESS EXPENSIVE GAS IN MY CAR?

  • Tiny
  • Glakken13
  • 2000 CADILLAC EL DORADO
  • 90,000 MILES

I have always used 93 in my caddy. Gas is so expensive anymore. Can I use a cheaper grade without damaging the engine?

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Tuesday, March 20th, 2012 AT 4:07 PM

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  • Tiny
  • Saturntech9
  • EXPERT
  • 30,229 POSTS

You have to use the grade gas listed in your owners manual do you know what grade that is?

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Tuesday, March 20th, 2012 AT 4:39 PM
  • Tiny
  • Caradiodoc
  • EXPERT
  • 25,980 POSTS

It depends on what's called for in the owner's manual. If 87 octane is sufficient, you won't gain anything by using 93. The higher the octane rating, the harder it is to ignite the fuel. That allows the engineers to design the engine for more power. The gas doesn't produce more power. Typically, higher compression engines, (raising compression is one way of increasing power), causes the fuel to self-ignite too early, and raising the octane rating prevents that. Not many engines require higher octane ratings today.

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Tuesday, March 20th, 2012 AT 4:44 PM
  • Tiny
  • Saturntech9
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  • 30,229 POSTS

The higher the octane the slower the fuel with burn to explain it in simpler terms.

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Tuesday, March 20th, 2012 AT 4:52 PM

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