Hi, Guest
12-31-2008, 02:29 PM
konafocuswrc,Dec 30 2008, 08:50 PM Wrote:#11, what difference would i see when using from 5w-30 to 5w-50??I'm no oil expert, but AFAIK the "5W" rating assures you of the low temperature rating (below 0 degrees Fahrenheit) which is important for protecting the engine at low temps, ie: at start up.
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In terms of the high temp rating the "30" rated oil would have quite a bit less viscosity at 100 degrees Centigrade than does the "50" ... based on my understanding the 50 would offer somewhat greater protection at the cost of performance and economy.
Technically the difference between SAE 30 and 50 is expressed as follows:
30 - between 9.3 and 12.5 cSt @ 100C
50 - between 16.3 and 21.9 cSt @ 100C
Hope this helps.
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2003 Focus ZX5 infra-red Track Rat - R*I*P
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New track rat: 2000 ZX3, Atlantic Blue * JRSC with lots more to come
* New Zetec crate motor - NFG - thanks Topspeed *