Rileysport
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Registered: 18th Jun 04
Location: West Yorkshire
User status: Offline
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What do they mean i.e
10w 40
15w 40
etc what do the numbers refer to 
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the_legend_of_yrag
Member
Registered: 7th Jul 03
Location: Cambridgeshire
User status: Offline
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How thin or thick it is?
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AuroraSport
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Registered: 5th Mar 05
Location: Norfolk Drives: Audi B5 S4 Avant
User status: Offline
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quote:
An oil’s viscosity is identified by its SAE’s (Society for Automotive Engineer’s) number. The thinner and oil, lower its number, e.g. SAE 10 W. The numerical relates to viscosity at particular temperature and the alphabet ‘W’, indicates the oil’s suitability for colder temperature. With the viscosity index improver, the viscosity increses at higher temperature and at lower temperature it does not increase significantly, thus achieving optimum viscosity at lower and higher temperature. Such oils are called multigrade oils, for instance ‘20 W40’ shows thinness at low temperature and thickness at higher temperature.
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GED2.0CORSA
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Registered: 28th Apr 04
Location: Mintlaw, Aberdeenshire
User status: Offline
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i could easily find out exactly what the differences are for u mate i work for CASTROL, in fact i might have a spec sheet on both of those oils here
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Martin
Member
Registered: 15th Mar 04
Location: Dumpstable Drives: Aztec Sxi
User status: Offline
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10 winter 40 summer
15 winter 40 summer
how 'thick' it goes in different conditions.
In the olden days, people would have to change to a different grade of oil in the winter,
not now however, we buy this stuff instead and leave it there all year through
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