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Fuel grade

Tiny
PCULQUI
  • MEMBER
  • 2005 TOYOTA SIENNA
  • 3.3L
  • V6
  • 4WD
  • AUTOMATIC
  • 119,000 MILES
I've been fueling my vehicle with 89 octane. I just went for maintenance on my vehicle and they told me I need to use 93 octane instead. If I use 89, they said I would be messing up my catalytic converter. They recommended Shell and Mobil.
I've been using Lucas oil when fueling with 89 octane.
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Friday, April 9th, 2021 AT 7:42 AM

5 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

First, all fuel is the same. It is branded from the refinery for each brand. One is not better than the other.

I attached the requirements below for you for the fuel octane. It is recommended 87 or higher. It will not damage the converter at all. The higher the octane, the better the performance.

I would not use any additives either. The fuel has all the additives that is needed.

Roy

Fluid Types

FUEL TYPE: UNLEADED gasoline

OCTANE RATING: 87 or higher (Research Octane Number 91)

For improved vehicle performance, the use of premium unleaded gasoline with an Octane Rating of 91 (Research Octane Number 96) or higher is recommended.

Capacities
FUEL TANK CAPACITY:. 79 L (21 gal, 17.5 Imp. Gal.)
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Friday, April 9th, 2021 AT 1:37 PM
Tiny
PCULQUI
  • MEMBER
  • 354 POSTS
So why did the repair shop (Hank May's GoodYear) tell me that the cat get dirty using 87 octane which will cause the catalytic converter to be replaced?
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Friday, April 9th, 2021 AT 6:34 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
That is a question only they can answer. It is inaccurate information.

Roy
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Saturday, April 10th, 2021 AT 3:53 AM
Tiny
PCULQUI
  • MEMBER
  • 354 POSTS
Okay, thanks.
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Saturday, April 10th, 2021 AT 4:00 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You are welcome.

Always glad to help.

Roy
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Saturday, April 10th, 2021 AT 4:16 AM

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