sunny
Member
Registered: 18th Feb 03
Location: Sydney, Australia
User status: Offline
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Sorry to ask but just wondering
What does the engine oil numbers mean?
ie "x W xx" x-numbers
and what is the best for corsa c?
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MoNkEy MaGiC
Member
Registered: 12th Apr 03
Location: West - London Drives: Corsa GSi
User status: Offline
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as far as i know, the second number is the maximum temperature the oil can reach, so 15w30 means 30degrees is highest it can get.
also, on older cars, the engine may start to make a clicking/tapping noise also rapid oil consumption, so using a thicker oil is better! as ive found out with my L reg gsi.
but newer cars use thin oil, such as fully synthetic oil which tends to be 5w or even 0w
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sunny
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Registered: 18th Feb 03
Location: Sydney, Australia
User status: Offline
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1.4 16v
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sunny
Member
Registered: 18th Feb 03
Location: Sydney, Australia
User status: Offline
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i seen one with 0W40?
so wat does that mean? 0 viscosity?
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Gambit
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Registered: 5th Jun 00
Location: Common Sense HQ
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the first number is the weight (viscosity) when the engine is cold, the second number is the weight (viscosity) when warm
30C oil  !! my blooming oil temp wont even register below 50C
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sunny
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Registered: 18th Feb 03
Location: Sydney, Australia
User status: Offline
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so any good suggestion on the type of eng oil use for corsa c 1.4 ?
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roy_newell
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Registered: 22nd Aug 03
Location: Stafford
User status: Offline
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lol @ temp of oil.
All them explosions happening per second and it only goes to 30C, lol
[Edited on 27-08-2003 by roy_newell]
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leafgreencorsa
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Registered: 5th Aug 02
Location: Somerset/Wilts Border
User status: Offline
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Years ago oils were of a single viscosity. If they were thick enough to give good protection when hot then they would tend to be too thick when cold so wouldn't give such good protection on start-up for example. This was OK back in the days of old engines with large build tolerances which would be re-built perhaps after 30,000 miles. Multigrade oils were developed to offer the best of both worlds. For example, a 10W40 oil offers the thin viscosity of a 10 oil at low temperatures to give good protection on cold starts (because it will circulate quickly). However, at high temperatures it will give the protection that a monograde 40 oil would have done at that temperature (the 10 would be too thin on its own at high temperatures).
Todays cars have much tighter machine tolerances and use many lightweight components etc. You therefore need thinner oils so 10W40 is now a common spec these days whereas years ago 20W50 would have been the norm. With high performance engines and extended drain intervals, synthetic oils have been developed at with lower ratings such as 0W5.
Hope this helps.
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DangerousDave16v
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Registered: 20th Feb 03
User status: Offline
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leafgreencorsa- Do you work in tribeology?
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Jamog
Member
Registered: 14th Sep 02
Location: Scotland
User status: Offline
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http://www.acute.f9.co.uk/crx/technical/faq/oil.htm
For anyone that wants to learn a bit more 
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leafgreencorsa
Member
Registered: 5th Aug 02
Location: Somerset/Wilts Border
User status: Offline
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quote:
Originally posted by DangerousDave16v
leafgreencorsa- Do you work in tribeology?
No I've just been around a (very) long time and sort of picked up loads of stuff like this. It's only useful stuff I can't remember!
[Edited on 28-08-2003 by leafgreencorsa]
[Edited on 28-08-2003 by leafgreencorsa]
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