This Could End Many Discussions...

[Wattz]

Originally Posted by camelll

, What kind of car would that have been wattz?

2001 Ford Focus.

Page 231 of the manual reads:

"Fuel quality

If you are experiencing starting, rough idle, or hesitation problems during a cold start, try a different brand of "Regular" unleaded gasoline. "Premium" unleaded gasoline is not recommended (particularly in the United States) because it may cause these problems to become more pronounced. If the problems persist, see your dealer or qualified service technician."

http://www.motorcraftservice.com/pub.../01focog4e.pdf

Probably a Ford Zetec engine issue mainly... But I'll stick with manufacturer recommended fuel octane.

[RUFFSTUFF]

Originally Posted by Wattz

2001 Ford Focus.

Page 231 of the manual reads:

"Fuel quality

If you are experiencing starting, rough idle, or hesitation problems during a cold start, try a different brand of "Regular" unleaded gasoline. "Premium" unleaded gasoline is not recommended (particularly in the United States) because it may cause these problems to become more pronounced. If the problems persist, see your dealer or qualified service technician."

http://www.motorcraftservice.com/pubs/content/~WO1FOC/~MUS~LEN/41/01focog4e.pdf

Probably a Ford Zetec engine issue mainly... But I'll stick with manufacturer recommended fuel octane.

Thanks for the info but it looks like you are misinterpreting what you are talking about. It doesn't say don't use premium, it is saying if your car cannot idle or start properly on regular gas don't use premium because it will make it worse. That makes sense. If your car cannot idle or start properly then there is something wrong (either mechanically or with with fueling) where your car cannot burn the fuel properly. A higher octane (which is more resistant to burning) would make this case worse. I don't believe your quote refers to not using premium if your car operates properly nor do I think it is saying that using premium will cause these issues to occur if your car was running fine on regular. The entire context of your quote deals with problems.

And your link doesn't work without an account.

[RUFFSTUFF]

Originally Posted by Wattz

But I'll stick with manufacturer recommended fuel octane.

Barring modifications, I think that is a good idea.