1998 Cadillac Deville `Gasoline type and grade

1998 CADILLAC DEVILLE
Avatar
JOFERNA
  • MEMBER
  • 1 POST
Engine Performance problem
1998 Cadillac Deville V8 Front Wheel Drive Automatic
----------------------------------------------------------------
What will happen if I use regular gas instead of premium in this car 98 caddy deville with a northstar engine. Car is only used for local driving under 35 miles per hour.
Jun 21, 2008 at 6:06 PM
Advertisement
Avatar
BASSMUSICIAN
  • MEMBER
  • 38 POSTS
I believe the car will run exactly the same as it does when you run the more expensive "premium" gas in it. I have a 1999 Deville, and I too was running premium at first, till my buddy who sells Caddys for a living told me not to waste my money on premium. Now if you can in your area, I'd suggest avoid using any gas that contains ANY Ethonol I used that in a pickup once, and had to have the entire throttle body rebuilt.
In your Caddys manual, it recommends premium, but it states as long as it is at least 87 octane, you are ok. It goes on to say it might make the engine ping, but my Northstar has never pinged on regular unleaded.
Hope I've helped.
Jack
Jun 29, 2008 at 2:03 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.