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I know, I know.... another viscosity post. :eek:

But this was being discussed on the Mark VIII board and they posted a Ford article about the change in recommended viscosity. I just thought I would share. :thumbsup:

(Sorry if this is a repost. :( )

The Mark VIII.org post:

http://www.markviii.org/htdocs/dc/dcboard.php?az=show_topic&forum=21&topic_id=38474&mesg_id=38474&listing_type=read_new

The Ford Article:


Article No.
01-4-7 ENGINE - ENGINE OIL - RECOMMENDED APPLICATIONS FOR SAE 5W-20 AND SAE 5W-30 MOTOR OILS - GASOLINE AND FLEXIBLE FUEL VEHICLES ONLY

Publication Date: FEBRUARY 20, 2001

FORD: 1992-2001 CROWN VICTORIA
1994-97 THUNDERBIRD
1995-2000 CONTOUR
1996-2001 MUSTANG, TAURUS
2001 ESCORT ZX2, ESCORT, FOCUS
1996-2001 ECONOLINE, RANGER, WINDSTAR
1997-99 F-250 LD
1997-2001 EXPEDITION, F-150
1999-2001 F-53 MOTORHOME, SUPER DUTY F SERIES
2000-2001 EXCURSION
2001 ESCAPE
LINCOLN: 1991-2001 TOWN CAR
1993-98 MARK VIII
1995-2001 CONTINENTAL
2000-2001 LS
1998-2001 NAVIGATOR
MERCURY: 1992-2001 GRAND MARQUIS
1994-97 COUGAR
1995-2000 MYSTIQUE
1996-2001 SABLE
1999-2001 COUGAR


NOTE: PLEASE REFER TO THE VEHICLE APPLICATION LIST LATER IN THIS TSB FOR A COMPLETE LIST OF VEHICLES AFFECTED BY THIS TSB.



ISSUE:
Engine oil recommended for use in 2001 vehicles is SAE 5W-20 motor oil. This oil has an improved formulation to improve fuel economy. This oil can also be used to service some previous model year vehicles.

ACTION:
Use SAE 5W-20 engine oil at recommended oil change intervals for 2001 vehicles, with the exception of the following vehicles listed in the "Exception 2001 Vehicles" chart.

All 2001 vehicles other than those listed in the "Exception 2001 Vehicles" chart are being filled with SAE 5W-20 motor oil at the factory and should also be serviced with SAE 5W-20 oil.

Vehicle Application Listing Approved For SAE 5W-20 Motor Oil
1995-2000 2.5L Contour/Mystique
1999-2001 2.5L Cougar
1996-2001 3.0L 4V Taurus/Sable
1999-2001 3.0L (Vulcan) Ranger (Flexible Fuel and Gas), Windstar, Taurus/Sable (Flexible Fuel and Gas)
1996-1997 3.8L Thunderbird/Cougar
1996-2001 3.8L Mustang and 3.8L SPI Windstar
1997-2001 4.2L (SPI) F-150 (under 8500 GVW only), Econoline
1996-2001 4.6L 2V Mustang
1992-2001 4.6L Crown Victoria/Grand Marquis
1991-2001 4.6L Town Car
1994-1997 4.6L 2V Thunderbird/Cougar
1996-2001 4.6L 4V Mustang Cobra
1995-2001 4.6L Continental
1993-1998 4.6L 4V Mark VIII
1998-2001 5.4L 2V/4V Navigator
1997-2001 4.6L 2V Triton F-150/250 (under 8500 GVW only), Econoline, Expedition
1997-2001 5.4L 2V F-150/250 (under 8500 GVW only), Expedition, E-150/250/350, E-350 Chassis/RV/Cutaway
1997-2001 6.8L E-250/350, E-350 Chassis/RV/Cutaway
1999-2001 6.8L Super Duty F-Series 250 HD/350/450/550 Motorhome
2001 2.0L Zetec/2.0L SPI Focus
2001 2.0L Zetec/3.0L Escape
2001 2.0L SPI Escort
2000-2001 5.4L/6.8L Excursion
2000-2001 3.0L Lincoln LS
2001 2.0L Zetec Escort ZX2
NOTE: THE "EXCEPTION 2001 VEHICLES" SHOULD BE SERVICED WITH SAE 5W-30 MOTOR OIL.



Exception 2001 Vehicles

Engine Vehicle
2.5L Ranger
3.3L Villager
3.9L Lincoln LS
4.0L Ranger, Explorer/Mountaineer, Explorer Sport, and Explorer Sport Trac
5.0L Explorer/Mountaineer

NOTE: IF VEHICLE IS NOT LISTED IN THIS APPLICATION, SAE 5W-30 OIL IS RECOMMENDED. REFER TO TSB 99-8-16 .
 

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I've been told that the engineers cringe when they read that...

it clearly states it's done because it's for fuel mileage not performance/longetivity. Now in a very very cold climate there is reason to like a 5w oil, but most of us don't live that far North. Also remember, the more thin the oil is, the more of it will leak past our crappy older valve stem seals...
 

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5w20 motorcraft oil is a group 3 blend with dino. It is made by conoco. It is a good oil to use in a low mileage car that does not leak. I considered using it in my truck, but I use 5w30 mobil1 which is a better oil.

The 5w30 motorcraft is not synthetic blend, but its still a decent dino.

Alot of guys have been doing wear analysis on mod motors with the 5w20 and it offers good protection and increased gas mileage.

But on race or supercharged applications, 10w30 is a no brainer.

JH
 
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