Fuel question

MelsRegal

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Regal GS 2017
Owners manual seems to suggest premium for best mileage and performance, it is a turbocharged engine.
 

BradR.G.

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Cascada Premium
See page 20 of the Cascada Owners Manuel. Premium is suggested, however 87 may be used as well. I may get fewer MPG but I didn't think the increased cost for premium fuel was worth the cost.
 

MelsRegal

Full Member
9,078
1,702
113
Buick Ownership
Regal GS 2017
See page 20 of the Cascada Owners Manuel. Premium is suggested, however 87 may be used as well. I may get fewer MPG but I didn't think the increased cost for premium fuel was worth the cost.
Your engine, but I would never use 87 on a regular basis on a turbo engine.
______________________________
 

Majic

New member
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Buick Ownership
2018 Encore Eccence
See page 20 of the Cascada Owners Manuel. Premium is suggested, however 87 may be used as well. I may get fewer MPG but I didn't think the increased cost for premium fuel was worth the cost.
I read that but wondered if anyone had anything positive or negative to say.
 

Majic

New member
17
6
3
Buick Ownership
2018 Encore Eccence
Your engine, but I would never use 87 on a regular basis on a turbo engine.
Compression and programming determine requirement....the turbo is on the exhaust side....it doesn't care what gas creates the exhaust that spins it.
 

MelsRegal

Full Member
9,078
1,702
113
Buick Ownership
Regal GS 2017
Compression and programming determine requirement....the turbo is on the exhaust side....it doesn't care what gas creates the exhaust that spins it.
But the turbos output forces additional air into the combustion chamber and the knock sensor will retard timing to compensate for the 87 and if that 87 octane gas is marginal in its octane value, results will be unpredictable. Better run 89 octane to cover your engines butt.
 
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