The Road Ahead : October November 2007
OCT/NOV 07 61 Free information booklet about making your Will An up to date Will provides for your loved ones, ensuring your wishes are met. By sending the coupon below you ll receive an easy to follow information booklet to help you make a difference in people s lives. Phone (07) 3222 6603 or visit salvos.org.au/wills Please send my free Wills information booklet "Your Will, Your Family and The Salvation Army" Wills and Bequests Director, The Salvation Army, GPO Box 1111, Brisbane QLD 4001. Mr/Mrs/Ms/Miss Address State Postcode Phone ■ Please send me a copy of the booklet 'Your Will Your Family and The Salvation Army ■ Please contact me with information about including The Salvation Army in my Will ■ I wish to advise that I have already included The Salvation Army in my Will Major Maree Strong and Stuart Diver WITH JOHN EWING Engine manufacturers leave vir tually no stone unturned in their quest for improved fuel efficiency, reduced emissions and better engine responsiveness. Commonly, in many late model cars this includes specifying what are known as low viscosity engine oils. Viscosity is the internal friction in a liquid or its resistance to flow. An oil of low viscosity is 'thinner' and 'flows' easier than one of higher viscosity. So this means there is less power-sapping 'drag' in the engine. Where oil viscosity ratings such as 15W-40 and 20W-40 were the norm, ratings such as 5W-30 and even 0W-40 are now frequently being specified. The lower the number, the 'thinner' the oil and conversely a higher number indicates greater viscosity. However, viscosity is temperature dependent, with resistance to flow dropping as the temperature rises. The examples shown are multigrade oils, hence the two numbers. They are designed to act like a 'thin' oil in lower temperatures (note the 'W' for winter), and a thicker oil in high temperatures. Get the good oil "...viscosity is temperature dependent, with resistance to flow dropping as the temperature rises." TORQUING POINT But producing low viscosity oils also brings technical challenges to ensure continued excellent engine protection and minimal oil consumption. Lower viscosity tends to reduce the shear stability (resistance to breakdown under stress) of the oil film and increases volatility. Some clever chemistr y sor ts these issues out and, as a result, there are new ser vice rating standards for these oils. The two common ratings are ILSAC GF2 and ACEA A1. ILSAC stands for International Lubricant Standardisation and Approval Committee and ACEA is the Association of European Automobile Manufacturers. These ratings are different from the more familiar and still used API ratings such as SF and SJ etc, but there's no real direct correlation. These new breeds of oils are generally full or par t synthetic oils and so will be considerably more expensive than older style lubricants. But it's vital to use engine oil of correct viscosity that also meets the specified ser vice rating. Consult the owner's handbook. Just as impor tantly, to prevent possible engine durability and oil consumption problems, these low viscosity oils shouldn't be used unless the engine maker specifies them. Proprietar y oil additives should definitely not be used with these oils. If you'd like some technical advice, visit racq.com.au or call RACQ's Technical Advisor y Ser vice on 3666 9148 or 1800 623 456 (members in countr y areas).
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