Diesel or Gasoline? - Mercedes-Benz Forum

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post #1 of 16 (permalink) Old 11-25-2006, 09:51 PM Thread Starter
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Diesel or Gasoline?

I'm interested to get some opinions on running a diesel Mercedes (W114/115) versus a gasoline engine. I've never owned a diesel before. I live in a hot climate (Phoenix AZ), it never snows or freezes, so cold-starting is a non-issue. I'm attracted to the better gas mileage of the diesel. How do diesels cope with very hot weather? It's routinely over 100 fahrenheit here for 7-8 months of the year. How reliable and troublefree is a diesel compared to a carburettor gasoline engine? Also, how to choose between 220D, 240D and 300D? I do like the wood in the 300D.


David
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post #2 of 16 (permalink) Old 11-25-2006, 10:35 PM
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I don't think too many gassers from 70's and 80's are still on the roads, while all diesels, who were not involved in accidents still do. Diesels are "cold blooded" meaning with high efficiency they produce less heat from the fuel than gassers. To the degree, that super efficient diesels (not imported to US) need additional burners for heating. So well running diesel will much less prone to overheating, than gasser.
240 is about 70 hp rated, 300 non-turbo 82, while turbo 112 HP.
Most of the people "can use" the 112 HP.
Good luck on your search.
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post #3 of 16 (permalink) Old 11-26-2006, 09:16 AM
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The main diesel complaints (from folks who don't like diesels) are the smell, smoke, noise, and lack of hp. They tolerate heat extremely well, and provide less problems mechanically than do gassers due to a much simpler design.

As far as old diesels go, it simply boils down to this -- you're either a diesel nut or you aren't. Diesel nuts aren't in a hurry, hear music rather than noise, and love the smell. It may be an acquired taste for some, but there are a bunch of them out there.

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post #4 of 16 (permalink) Old 11-26-2006, 01:28 PM
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the 300D is usualy accecpted as the prefered model, cruises at 75 all day long without much fuss as long as its flat. in general 300D's are in better shape rust wise than other models but seeing that you live it the south west they should be bery similar.

the 240D came in a a manual transmission if that suits your fancy

running on B20, 20% bio diesel, my 76' W115 runs much smoother, smokes much less and smells better to boot.

if you want to venture into running straight vegitable oil and enjoy free fuel while reducing emmisions signifantly there is no better vechile than the W114/115's
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post #5 of 16 (permalink) Old 11-26-2006, 01:38 PM
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Quote:
Originally Posted by GermanStar
. Diesel nuts aren't in a hurry, hear music rather than noise, and love the smell. .
Disagree. I am maybe not a nut, but I am diesel enthusiast and I am always in hurry. Even driving diesel MB I average close to 80 mph on 500-mile trip in congested California.
Sure you can forget about 35 mpg at those speeds, but it is still 15-20% better, than newer gasser at those speeds.
My diesel pickup average 10 mpg, because I still like to drive it at 70-75 mph.
Diesel loose some with slower acceleration, but gains quite a lot on skipping fueling stops.
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post #6 of 16 (permalink) Old 11-26-2006, 03:01 PM
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Allow me to clarify -- not in a hurry around town. My reference was to acceleration.

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post #7 of 16 (permalink) Old 11-26-2006, 03:33 PM
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The old dillema "The man, or the machine?"
Even in 90 HP Jetta I was beating in the city 99.99% of cars.
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post #8 of 16 (permalink) Old 11-26-2006, 06:48 PM
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David, try driving some of the cars. It really depends on your needs. You'll have to prioritize, fuel economy, time, acceleration, and freeway cruising speed. The fastest is a 300D Turbo, if you're not an agressive driver there are slower cars which are perfectly suitable as long as you educate yourself on them and their quirks.

Being in Arizona you would not have any cold starting problems as you mentioned.

1977 - W116 - 6.9
1974 - W115 - 240D /8 - 4(M) OM617.910 + Turbo + 300D FW - Completed 7/8/10
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post #9 of 16 (permalink) Old 11-26-2006, 11:26 PM Thread Starter
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Since I see you own both W115 and W123 diesels, how do they compare? Is the W123 much better? I really prefer the shape of the W114/W115 to the later models even though the later models may be more refined.
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post #10 of 16 (permalink) Old 11-27-2006, 12:03 AM
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I find the suspension geometry and style of the 115 preferable to the redesigned front end and different looks of the 123.

The 115 - 240d is slower and vibrates more, but is cuter ( ok my distorted vision ) .

The 123 - 300d is great for its better power and smoother engine , but drives more "tank like" .

See if you can get out and test drive one of each , you will feel the difference immediately.

'76 - 300D
'72 - 240D (noddy)
'40 Chev pickup
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