1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

City Driving: Overdrive or 3rd gear

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Old 09-08-2004, 10:57 AM
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Originally Posted by rnbraud
Just wanted to update you guys.

I did a SeaFoam cleaning this past weekend. Puffed out some smoke but not a lot. I also just finished my first full tank of Premium unleaded.

I did see a pretty big improvement in driveablility. She now pulls pretty good. Will wait till the third or fourth fillup to see if there is an improvement in mileage.

WIll keep you guys posted and thanks for the help.
hope everything goes well
Old 09-08-2004, 11:19 AM
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and for the record (for everyone out there) prolonged use of 3rd gear won't hurt your tranny at all... about the only thing it'll do is run you're RPM'* higher...
Old 09-08-2004, 11:23 AM
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Thanks mkake. That was my concern from my original post.

The only other question is whether doing so will help or hurt gas mileage in heavy city driving?

Any thoughts?

Thanks.
Old 09-08-2004, 12:26 PM
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Originally Posted by rnbraud
Thanks mkake. That was my concern from my original post.

The only other question is whether doing so will help or hurt gas mileage in heavy city driving?

Any thoughts?

Thanks.
Don't quote me on it.. I think it will be the same if not a tad better as you don't need to be on the gas more to get it to move from lets say 70km to 80km ( sorry.. us work in KM ) while it'* in OD. PErsonal preference again.. but I sometimes leave it in OD cause there will be times I forget and leave it in 3rd when I"m out of the city
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