Can you use regular unleaded gas in a Cadillac Northstar engine?
by 
The Curious Bag
ANSWERS: 1
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<h4 class="dechead">On One Hand: Older Cadillac Northstars
Unleaded gasoline is the standard in auto fuel. If a vehicle does not run on diesel, it runs on unleaded gasoline. Any gasoline engine, new or old, can use regular unleaded gasoline. An older Cadillac Northstar engine runs on unleaded gasoline. Never put anything but unleaded gasoline in this engine.
On the Other: Newer Cadillac Northstars
Newer Cadillac Northstar engines are flex-fuel, which means they can use E-85 fuel or unleaded gasoline.
Bottom Line
Yes, you can use regular unleaded gasoline in your Cadillac Northstar engine, even if it is compatible with E-85 fuel. If you have an older Cadillac Northstar, though, use only unleaded gasoline unless you know for sure that it is a flex-fuel vehicle.
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