Some required 93 and some required 87, depends on model and year
Cadillac recommends you use Premium fuel of 91 octane.
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.
91 Octane Premium Fuel. Use nothing less or nothing higher.
Premium is recommended for the ETC models
Fuel Requirement unleaded premium, 92 octane
The O2 sensor on a 2003 Cadillac Northstar engine is located in the exhaust manifold. The readings from this sensor are sent to the vehicle's computer, which makes constant adjustments to the fuel and air mixture.
91 or higher octane fuel
1998 and 1999 caddys with the LD8 AND L37 (NORTHSTAR) ENGINES.
This car is recommended for 91 octane
All Subaru SVX engines were designed to run on premium fuel of 93 octane.
Premium Unleaded 91 octane fuel.
91 octane there should also be a sticker inside the fuel door that will tell you what the cars requirement is