Type of Fuel?

Tiny
VICTORBZE
  • MEMBER
  • 2007 TOYOTA RAV4
  • 2.4L
  • 4 CYL
  • AUTOMATIC
  • 300,000 MILES
Hello, I have been using Premium Fuel and my Catalyst went in (Check Engine Light came on). Some mechanics told me it was because I was using Premium instead of Regular Fuel. Other mechanics tell me fuel has no issue on the catalyst. Now I don't know what it is. Please help.
Tuesday, October 10th, 2023 AT 8:42 AM

7 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
The higher the octane rating the more work the engine can do, so if you are towing or doing high performance driving use the higher-octane fuel, if you are just driving around town, you can use the lower octane fuel.

This guide can help:

https://www.2carpros.com/articles/understanding-octane-ratings-when-to-use-high-octane-fuel

Please let us know if you need anything else to get the problem fixed.
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Tuesday, October 10th, 2023 AT 10:28 AM
Tiny
VICTORBZE
  • MEMBER
  • 4 POSTS
Thanks for the reply, but I am still trying to find out if the type of fuel that I am using (Premium) had an effect on my damaged catalyst.
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Tuesday, October 10th, 2023 AT 10:36 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
Sorry, you should be using unleaded fuel only.
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Tuesday, October 10th, 2023 AT 5:40 PM
Tiny
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  • MEMBER
  • 4 POSTS
Thank you very much.
I have one Final question before I close this thread:
Is unleaded the same as Regular Fuel?
Just want to make sure 100%.
Thanks once again.
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Wednesday, October 11th, 2023 AT 5:45 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
Most fuel is unleaded which it can tell you on the pump it is being dispensed from. There are both regular and premium grade unleaded fuel.
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Wednesday, October 11th, 2023 AT 7:53 AM
Tiny
VICTORBZE
  • MEMBER
  • 4 POSTS
Thank you very much.
Your assistance is very much appreciated.
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Wednesday, October 11th, 2023 AT 7:57 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
You are welcome.
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Thursday, October 12th, 2023 AT 8:22 AM

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