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<blockquote data-quote="gone" data-source="post: 244330" data-attributes="member: 5899"><p>Page 226 of the 2021 C8 manual tells us:</p><p></p><p><strong>Fuel</strong></p><p><strong><u>Top Tier Fuel</u></strong></p><p><strong>GM recommends the use of TOP TIER Detergent Gasoline to keep the engine clean, reduce engine deposits, and maintain optimal vehicle performance. Look for the TOP TIER Logo or see <a href="http://www.toptiergas.com" target="_blank">www.toptiergas.com</a> for a list of TOP TIER Detergent Gasoline marketers and applicable countries.</strong></p><p></p><p>Then looking at the "toptiergas.com" Website, it tells us:</p><p></p><p><strong>TOP TIER™ is recognized as a premier fuel performance specification developed and enforced by leading automotive and heavy duty equipment manufacturers. The intention of TOP TIER™ is to create a winning situation for retailers, auto manufacturers, and drivers.</strong></p><p><strong>Vehicle and equipment manufacturer sponsors have a specification by which they can drive market fuel improvements to meet the ever changing demands of engine technology when regulations or specifications may not go far enough.</strong></p><p></p><h4>There are several ways to recognize a TOP TIER™ fuel retailer.</h4> <ul> <li data-xf-list-type="ul"><strong>Many fueling stations selling TOP TIER™ licensed brands prominently display the TOP TIER™ logo on the pump, pump handle, canopy or in a station window. The TOP TIER™ logo means you’re getting fuel that meets the performance requirements set by engine manufacturers.</strong></li> <li data-xf-list-type="ul"><strong>Check the licensed brand list. If the brand of <a href="https://www.toptiergas.com/licensed-brands/" target="_blank">gasoline </a>or <a href="https://www.toptiergas.com/diesel-licensed-brands/" target="_blank">diesel </a>on the signage or the dispensing pump is not listed, the fuel is not TOP TIER™. If a retailer is on the brands list but a TOP TIER™ logo isn't displayed at the station, please <a href="https://www.toptiergas.com/contact-us/" target="_blank">contact us</a>.</strong></li> <li data-xf-list-type="ul"><strong>Ask the station operator.</strong></li> </ul><p>Then there's a list of "top tier gas suppliers" found in Canada. There are some "odd locations" (not so common, or certainly not for me in Western Canada) but you're likely to find "top tier gas" at the more common locations listed below:</p><p></p><p><span style="font-size: 22px"><u>Costco, Esso and Shell</u></span></p><p></p><p><span style="font-size: 15px">I've also seen Petro-Can described as a "top tier fuel" supplier on other Websites, but it's not listed on </span>"toptiergas.com".</p><p></p><p>It's likely best to verify any place you go, has this type of fuel by following the Website suggestions above.</p><p></p><p>As with most things, the fuel type is controversial. Some say lower octane (ie. 87) is all you need and it's a waste of money to pay for higher octane, despite what vehicle manufacturers say. Others won't care about the detergents in the "top tier fuels". IMO the engine is the most expensive/important part of any vehicle and with higher performance motors in particular, I always follow the manufacturer's advice and use higher octane (mostly 91 is all I have readily available where I am) and only from one of the 3 gas stations mentioned above (Costco, Esso or Shell). The C8 manual also states on page 226:</p><p></p><p><strong>If the octane is less than 91, the engine could be damaged and the repairs would not be covered by the vehicle warranty.</strong></p><p></p><p>So that's another thing to keep in mind. Pages 226 and 227 of your 2021 manual are recommended reading...along with most of the other pages in the manual to better understand your vehicle. Good luck!</p></blockquote><p></p>
[QUOTE="gone, post: 244330, member: 5899"] Page 226 of the 2021 C8 manual tells us: [B]Fuel [U]Top Tier Fuel[/U] GM recommends the use of TOP TIER Detergent Gasoline to keep the engine clean, reduce engine deposits, and maintain optimal vehicle performance. Look for the TOP TIER Logo or see [URL='http://www.toptiergas.com']www.toptiergas.com[/URL] for a list of TOP TIER Detergent Gasoline marketers and applicable countries.[/B] Then looking at the "toptiergas.com" Website, it tells us: [B]TOP TIER™ is recognized as a premier fuel performance specification developed and enforced by leading automotive and heavy duty equipment manufacturers. The intention of TOP TIER™ is to create a winning situation for retailers, auto manufacturers, and drivers. Vehicle and equipment manufacturer sponsors have a specification by which they can drive market fuel improvements to meet the ever changing demands of engine technology when regulations or specifications may not go far enough.[/B] [HEADING=3]There are several ways to recognize a TOP TIER™ fuel retailer.[/HEADING] [LIST] [*][B]Many fueling stations selling TOP TIER™ licensed brands prominently display the TOP TIER™ logo on the pump, pump handle, canopy or in a station window. The TOP TIER™ logo means you’re getting fuel that meets the performance requirements set by engine manufacturers.[/B] [*][B]Check the licensed brand list. If the brand of [URL='https://www.toptiergas.com/licensed-brands/']gasoline [/URL]or [URL='https://www.toptiergas.com/diesel-licensed-brands/']diesel [/URL]on the signage or the dispensing pump is not listed, the fuel is not TOP TIER™. If a retailer is on the brands list but a TOP TIER™ logo isn't displayed at the station, please [URL='https://www.toptiergas.com/contact-us/']contact us[/URL].[/B] [*][B]Ask the station operator.[/B] [/LIST] Then there's a list of "top tier gas suppliers" found in Canada. There are some "odd locations" (not so common, or certainly not for me in Western Canada) but you're likely to find "top tier gas" at the more common locations listed below: [SIZE=6][U]Costco, Esso and Shell[/U][/SIZE] [SIZE=4]I've also seen Petro-Can described as a "top tier fuel" supplier on other Websites, but it's not listed on[B] [/B][/SIZE]"toptiergas.com". It's likely best to verify any place you go, has this type of fuel by following the Website suggestions above. As with most things, the fuel type is controversial. Some say lower octane (ie. 87) is all you need and it's a waste of money to pay for higher octane, despite what vehicle manufacturers say. Others won't care about the detergents in the "top tier fuels". IMO the engine is the most expensive/important part of any vehicle and with higher performance motors in particular, I always follow the manufacturer's advice and use higher octane (mostly 91 is all I have readily available where I am) and only from one of the 3 gas stations mentioned above (Costco, Esso or Shell). The C8 manual also states on page 226: [B]If the octane is less than 91, the engine could be damaged and the repairs would not be covered by the vehicle warranty.[/B] So that's another thing to keep in mind. Pages 226 and 227 of your 2021 manual are recommended reading...along with most of the other pages in the manual to better understand your vehicle. Good luck! [/QUOTE]
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