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Old 11-18-2003, 10:02 AM   #71
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FYI

I received the following from Castrol when inquiring about when Syntec would be available in 5w-20.

"At this time, Castrol offers SYNTEC Blend SAE 5w-20.
We will be sending out a notice to all consumers who have been
interested in the SYNTEC 5w-20 grade when more information is received
from our Research and Development Division.

Deviating from the GRADE recommended by the manufacturer may void your
warranty.

Please contact your OEM for the details of your warranty.

To explain viscosities, the (Society of Automotive Engineers) 'SAE'
rating measures the viscosity, or the thickness, of the oil. Under this
system, oil viscosity is measured at specified low temperatures and
depending on the measured viscosity, the oil is assigned into a "W"
(winter) category or grade, for example the "5" in "5w-30".

The "W" grade provides an indication of how well an engine will crank in
the winter and how well the oil will flow at low temperatures. The lower
the number preceding the "W", the thinner or more fluid the oil is at
low temperatures.

The second number represents the oil's viscosity measured at a specified
high temperature. The higher the number, the thicker the oil, and gives
an indication of the oil's thickness at engine operating temperatures.
A 5w-30 would provide the same low temperature pumpability as the 5w-20,
but would be thicker once the engine reaches operating temperature."

Castrol Consumer Relations.
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Old 11-19-2003, 09:23 PM   #72
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Anyone know if teflon harms your engine or prevents you from using another type of oil if you switch? Or does it just clog filters
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Old 11-19-2003, 09:26 PM   #73
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Outta curiosity, whats the intervals of oil changes with synthetic, 6k?
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Old 11-20-2003, 07:13 AM   #74
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there was a good article about teflon in some products like slick 50. It basicly said most of the teflon particles were to big for the filter, and would clog the filter. It highly recommended staying away from telflon oil products. I seriously doubt mobil one has teflon
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Old 11-23-2003, 06:04 PM   #75
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I know from first hand experience, using the wrong weight oil could damage your engine. Luckily it was not my car and for that matter not even a Focus, but here goes: A Crown Victoria Police Cruiser blew the engine when a patrolman added about 1 1/2 quarts of 15w40 diesel truck oil to his cruiser. 3 weeks later the engine blew up. Seems that the car was used in a pursuit, the oil pressure relief valve stuck on full, the filter material in the oil filter looked like someone stepped on it when the oil filter was cut apart. Seems that all that oil pressure backed up at the filter material and when it crushed the material, the oil was blocked and the engine starved for oil causing the engine to sieze. All from less that 2 quarts of the wrong oil! OUCH

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Old 11-25-2003, 09:41 AM   #76
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Well thats a good example of why to not add truck oil to your car, I dont think anyone here is that stupid, I really dont understand why everyone is against 10w oils though, almost every performance shop around here reccomends using a 10w full synthetic oil
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Old 11-25-2003, 04:24 PM   #77
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Well thats a good example of why to not add truck oil to your car, I dont think anyone here is that stupid, I really dont understand why everyone is against 10w oils though, almost every performance shop around here reccomends using a 10w full synthetic oil

It has nothing to do with a "truck oil" I doubt it had anything to do with the weight of the oil either. I think the valve just stuck. what performance shop recommends 10W oil? maybe a top fuel car or rail dragster would use that weight for less friction and better times, but they rebuild those engines after just a few runs. I will bet that nascar doesn't use 10W oil. Or circle track. or indy cars. Or street cars
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Old 11-25-2003, 04:28 PM   #78
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Ive always grown up using 10w oil, just recently as Ive got a new car have I seen 5w-30 as the standard, I dont see why its harmful
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Old 11-25-2003, 09:37 PM   #79
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because it is to thin in the high heat of automotive engines. It breaks down in that heat and it is not designed for auto engines. I grew up in the '60s and '70s and only remember the neanderthol days of using straight 30 weight. I have never heard of 10W oil as recommended
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Old 11-25-2003, 11:21 PM   #80
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so what do you use a 10w oil in then if its not for cars? This seems bogus to me
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