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  #1  
Old 06-28-2001, 11:12 AM
Oliverp's Avatar
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Join Date: Aug 2000
Location: Toronto, Canada
Posts: 436
Hello again,

The W126 300SE has 141,000 miles. As I explained in my last message, I'm trying to get better economy.
Are there any particular parts that if replaced would better economy?
I was thinking maybe the distributor and rotor, and maybe some filters or something.

Thanks for any help
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Oliver Plante

---My Previous MBs---
87 300SE (Sold) - Black, Cream Leather
89 300SE (Sold and missed) - Black, Cream Leather
87 420SEL (Died!) - Bronze, Black Leather

---Father's Previous MB's---
2004 S320 CDi - Black, Cream Leather, 18" AMGs
2001 CL500 (Stolen!) - Black, Cream Leather
1999 E55 AMG - Black, Black Leather
1994 500SE - Black, Cream Leather
1990 300SE - Midnight Blue, Cream Leather
1986 420SEL - Diamond Blue, Cream Leather
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  #2  
Old 06-28-2001, 06:50 PM
Tim Robson
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The engine, definitely. Putting a diesel in there would bring the consumption way down.

Seriously, though, there are a few things which will help. A dirty air filter and infrequent oil changes will result in slightly increased fuel consumption (the filter because of constricted air flow and the oil because of diminished lubricating capability - pretty minor effect, admittedly). Problems with the ignition system can result in incomplete combustion which will result in reduced fuel economy. A defective or worn-out oxygen sensor will send a "lean" reading to the fuel injection control system, resulting in an unnecessarily rich mixture. Underinflated tires will reduce fuel economy. Finally, but most significantly, driving habits are a major factor, so watch your economy gauge!

All that said, don't start replacing parts unless you know that they're defective or worn out; you'll spend a lot of money for little or no return in fuel cost savings. The MB gas engines (particularly when mounted in a car like the S-Class) do not offer particularly outstanding fuel economy, and most require premium fuel, so if your fuel costs are giving you heartburn, then you maybe should consider another alternative; the diesels are much more efficient.

If the clatter and smoke of a diesel are a turn off, there may be some consolation in the fact that gas prices are slowly coming back down - for the moment (at least where I am).
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  #3  
Old 06-29-2001, 02:41 AM
ymsin's Avatar
Driver, Mercedes-Benz
 
Join Date: Feb 2001
Location: Malaysia
Posts: 1,645
Clean plugs, air filter, oil and oil filter change when required - no hard driving, good MICHELLIN tyres at recommended pressure, and above all ... right engine tuning for fuel/air mixture.

You'd be fine.

Glad to have you back in our MB fold, Oliver.
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126 tailed by a 203, 129 leading the pack.
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  #4  
Old 06-29-2001, 07:04 PM
sixto's Avatar
smoke gets in your eyes
 
Join Date: Jun 2000
Location: SF Bay Area
Posts: 19,751
A couple of tire shop guys told me to run closer to the maximum pressure stated on the tire than the recommended pressure stated on the filler cap. They set my tires at 40psi. The Bridgestone tires that came on my car as so bad that increasing the pressure didn't hurt the ride. The car feels a lot lighter.

My daily round trip commute is 30 miles and takes 50 minutes. I get about 17mpg. If I can throw in some time cruising at 75-80mph, I get about 19mpg.

When better fuel economy becomes more important than sheer mass, I'll trade my car for an LS400. Despite a bigger and more powerful engine, they routinely get 20mpg or better with barely a thought.

Regards,
Sixto
91 300SE
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  #5  
Old 06-29-2001, 11:44 PM
ymsin's Avatar
Driver, Mercedes-Benz
 
Join Date: Feb 2001
Location: Malaysia
Posts: 1,645
40psi?

Wow - thats really blowing it. The ride would be quite bumpy and noisy wouldn't it?

The highest I ever inflated was 36 psi.
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126 tailed by a 203, 129 leading the pack.
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  #6  
Old 07-01-2001, 05:11 AM
sixto's Avatar
smoke gets in your eyes
 
Join Date: Jun 2000
Location: SF Bay Area
Posts: 19,751
If you ever have the misfortune of riding on Bridgestone Eager tires, the higher the pressure, the less noisy they are. They're rated at 44psi and 40 has not been a problem.

I have regular duty Bilsteins and the ride at 40psi is not close to objectionable.

Sixto
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