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regular unleaded. 89 octane
Some required 93 and some required 87, depends on model and year
No. 91 octane is the minimum. I notice a huge difference in the way a Cadillac runs on 87. I always put 93 octane in Cadillac Fuel systems.
Cadillac recommends you use Premium fuel of 91 octane.
your car must have 93 octane.
93 octane works best.
Cadillac 1958 with the compression ratio of 10.25:1 should not run on gas below 98 octane.
92
87
91%
87 octane
91 Octane is the minimum octane requirement for this 5.4 Engine.