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Buick Lucerne: Real World MPG

104 messages,  Last post on Apr 11, 2009 at 8:01 PM

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What is this discussion about? Buick Lucerne, Fuel Efficiency (MPG), Sedan

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#103 of 104 Re: Oil and vibrations [cold_motoring] by kenb757 Apr 02, 2009 (7:06 am)
Replying to: cold_motoring (Apr 01, 2009 11:50 am) Does GM use a special break-in oil or additve for the initial factory fill, or is it the over-the-counter (Goodwrench?) stuff? My DTS got about 2 mpg better (at 20 mpg) than my Lucerne Super, but I think it has more to do with tuning and the final drive ratio, than with other inherent differences in the Northstar V-8s.
#104 of 104 Re: Oil and vibrations [cold_motoring] by buicks5 Apr 11, 2009 (8:01 pm)
Replying to: cold_motoring (Apr 01, 2009 11:50 am) If you happen to ever see this reply, then please note that I have a 2000 Park Ave Ultra with the supercharged 3.8. This supercharged 3.8 now has 204,000 miles on it and is the best running car and engine of any vehicle i have ever owner at any miles on a vehicle. It does use a tiny amount of oil (1qt at 2500-3500 miles), past the rear valve cover, which is normal. GM replaces the gaskets on other applications, because of possible fire from dripping oil, but not an issue on this car.   The supercharger uses a tiny about of oil at about 5,000 miles; maybe 1/4-1/2 pint. Engine starts instantly, does not smoke under any conditions, and pulls hard with good acceleration. I have always used Mobil 1 10/30 with Mobil 1 filter (extra fine filtration).   The water pump is still good and tight and the dealer says the timing chain generally does not require replacement, even at high miles...a rarity.   Fuel economy is 24-25mpg at 75-80m mph and 29-31mpg at 55-60mph. Commuting at 17 miles one way is about 21-22mpg.   Shame that GM found it necessary to cease production. I had a 3.8 in a Toronado and it was also bulletproof. What a terrific engine!

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