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03:46:13 - 12/24/2024
V8 Dakotas
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kmosabi
Dodge Dakota
JOIN HERE
7/02/2003
11:15:48
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 Subject: what grade synthetic to use?
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Message:
I have swithed to synthetic, and I believe that the manual calls for 5W-30 for v-8's. Is this what everyone is using?
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AmsoilSponsor
DakotaEnthusiast
 
7/02/2003
12:07:38
|  what grade synthetic to use? Amsoil?
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Message:
Viscosity Information Thread - Provided By Amsoil Sponsor
Steven Roark , Amsoil Dealer , Proud Sponsor of www.DodgeDakotas.com
AMSOIL Synthetic Motor Oils, Lubricants, Filtration, and Truck Care Products
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AmsoilSponsor
DakotaEnthusiast
7/02/2003
12:13:29
| VISCOSITY & GRADE -- AMSOIL
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Message:
After I posted that last thread link, I realized there was quite a bit of flaming
there ... so I am simply reposting here:
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NOTE: You should try to stay within the manufacturers recommended guidlines ... with minor adjustments based on climate, driving conditions, and dryiving style.
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VISCOSITY
VISCOSITY..in the general term is defined as " a fluids resistance to flow". it's a measure of the internal friction of the fluid or the resistance to the movement of one layer of molecules relative to an adjacent layer.
THE LOWER (SMALLER or FIRST #, as in "10w-_) NUMBER.. is the Cold Cranking measurement, made at low temperatures, using a concentric cylinder viscometer to predict the oils cranking resistance in an engine during cold starting.
The measuring devices, or viscosmeters, most often used are in the form of close-fitting concentric cylinders. The fluid being evaluated is placed between the cylinder walls, the outer cylinder is held stationary and the inner cylinder is rotated. The speed of rotation is measured for a given force to calculate the viscosity, most commonly reported in cp or centipoise units. Also known as Absolute Viscosity.
THE HIGHER (BIGGER or SECOND #, as in "-30") NUMBER...is commonly measured in capilary tubes, in which the time for a fixed volume of fluid to flow through the tube under gravity at operating temp (100c)is measured and reported as cSt or centistokes. This is used most commonly to report the normal operating viscosity of motor oils or the higher number.
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VISCOSITY GRADE
" 0W- " is a viscosity GRADE, not a viscosity MEASUREMENT.
When testing for cold fluidity, the temperature is lowered approximately 5 degrees centigrade between each test.
The Cold Crank Simulator Apparent Viscosity is tested at:
-20 C for 10W-
-25 C fpr 5W-
-30 C for 0W-
It is my understanding that the oil has to be labelled at the lowest temperature it meets the specifications.
It may not be long before someone comes out with a " -5W-30 " which would correspond with -35 C.
Steven Roark , Amsoil Dealer , Proud Sponsor of www.DodgeDakotas.com
AMSOIL Synthetic Motor Oils, Lubricants, Filtration, and Truck Care Products
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