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Old 02-10-2009, 02:32 AM
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Join Date: Dec 2008
Posts: 53
250s questions

Hey guys, so I have the dash all apart for restore and have been running the blower. It has a tendency to whistle start and whistle stop. Trying to figure out if I should replace it since I have the entire dash apart. But it isn't broken, why fix it maybe?

Unical 76 has a 100 octane gas. I am thinking about trying it out. Anyone else tried this or have thoughts on it?

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Old 02-10-2009, 02:41 AM
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Join Date: May 2001
Location: Northern Va.
Posts: 3,386
Those cars are built around the ventilation system. Fix or replace the fan and have the heater core checked as well. The controls should be checked as well and the controls are also available.


Currently 1965 220Sb, 2002 FORD Crown Vic Police Interceptor

Had 1965 220SEb, 1967 230S, 280SE 4.5, 300SE (W126), 420SEL


Not part of the in-crowd since 1952.
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Old 02-10-2009, 03:29 AM
Join Date: Sep 2005
Posts: 664
If the sound is what I think it is your fan's motor is about to freeze up. You can oil the motor's bearings with transmission fluid and see if the whisel stops. If so the bearings are bad.

If the fan's motor's bearings are bad replace the fan motor. You don't want to have to tear in there again if you don't have to.
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Old 02-10-2009, 01:18 PM
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Join Date: May 2008
Posts: 154
Gas has changed in ratings over the years. Today's regular 87 octane is almost similar to 100 octane from 40 years ago. I have read all you need is regular gas in todays older engines.


1967 - 250S
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Old 02-13-2009, 11:20 AM
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Join Date: Jul 2008
Posts: 158
I am fascinated by your reply regarding today's 87 octane being the equivalent of 100 octane 40 years ago. I can remember when I had my 220sb and would drive out of my way for the Sunoco pump with the dial on it for the octane you wanted to put in your car!
Would you happen to have a reference for the fact above? I would like to read it if for nothing else than the logic behind the deduction.
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Old 02-13-2009, 09:36 PM
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Posts: 154

Here is one link for gasoline. The petroleum institute has stuff on gas too. Best thing I found was to google -- gasoline octane --- or ''classic gasoline octane" or ''older car gasoline ocatane'' you will find enough information to read till you are blue in the face.
There are some really good people who write articles about gasoline. I cannot remember off the top of my head the article that I read, but when I read it I felt regular octane for my benz was going to work just fine. I guess if you want use premium or find 100 octane somewhere else you can, but I don't think the time, and savings is going to be worth the extra money spent to use premium, or 100 octane. It is interesting reading when it comes to gas though.

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Old 02-14-2009, 09:13 PM
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Join Date: Jul 2008
Posts: 158
I checked out the site-comprehensive, to say the least.
I have worked in the petrochemical business but all on the transportation side-I have seen the changes in the formulations of fuel-typical purple or water white premiums to the generic green color of today's gas. The formulations have been changed in order to cope with environmental concerns-lower Reid Vapor Pressure and lead content in the case of gas and Ultra-Low-Sulfur distillates in the case of diesel. Each fuel has been marketed to reflect engine designs as well as environmental concerns-specifically particulates which are prevalent in the unburned fuel of diesels. Contrast a 240d with the Blu-Tec diesel.
I am hardly an expert on fuel; however, when I was deciding what type of delivery system I wanted in my old MB it was to be a fuel injected gas instead of a carbureted and or a diesel engine. The feeling I had was that the fuel injection system is essentially closed and the older diesel engines need plenty of sulfur to keep them running longer. The only downside was the use of premium in the 280se. So If you can remember where or from whom you got that information about today's 87 octane being equal to yesterday's 100 octane that would be great. In the meantime I will try a little detective work and get back to you on this subject.
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Old 02-14-2009, 09:20 PM
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Join Date: Mar 2007
Location: Hampton Roads, Virginia
Posts: 3,366
Octane is calculated differently now than "back in the day".

We now use RON + MON / 2.

I recall it used to be just one of the components....

RON Research octane Number
MON Motor Octane Number

14 E250 BlueTEC black. 45k miles
95 E320 Cabriolet Emerald green 66k miles
94 E320 Cabriolet Emerald green 152k miles
85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles
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Old 02-14-2009, 11:53 PM
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Well I am certainly no expert on gasoline. When I was searching on google, I was looking through 1967 items if I recall, and found the article on gasoline. I have no idea where it is today. I did write a paper in college on how they find crude oil, and how it is made into gasoline, but that is the extent of my oil and gas venture. When I read the article I wanted to save it, but I didn't, and with google there are so many sites it's hard to remember. I will keep searching, and if I find it, I will post it.


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