Regular 87 Unleaded on 2000 up STS?
 

Hi guys I just read somewhere that in 2000 Cadillac changed the N* to accept regular 87 octane gas. Is this true? Should I stick with premium fuel? Dont wanna hurt my baby lol!

RE: Regular 87 Unleaded on 2000 up STS?
 

rule of thumb: use the lowest octane that the car can run on w/o pinging.

RE: Regular 87 Unleaded on 2000 up STS?
 

Het Stomper, is that why your Allante ran like a tin lizzy.(LOL)

Jono

RE: Regular 87 Unleaded on 2000 up STS?
 

This is true.

Compression ratio dropped to 10:1 combined with fast burn technology. Go crazy saving money on fuel.

RE: Regular 87 Unleaded on 2000 up STS?
 

Thanks for the info guys! I now know its safe to use reg at the pump!! Did the production of these N* motors come in all 00 and up STS including 2000 models released in 1999? Is there any way I can check my STS to make sure?

RE: Regular 87 Unleaded on 2000 up STS?
 

What about the '05 models, I read that they used the 10.5:1 LH2 motor, will this run on regular?