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Message: <blockquote data-quote="manjit" data-source="post: 138866" data-attributes="member: 323">I've been using Wurth Triathlon 5W50 for my 14 year old bim. for the past  2 years...and frankly it was all fine....no anticipation towards oil loss as there wasn't any......super coasting above 120km/h.....and then come the mean magnatec 10w40.....hard cruising beyond 120km/h. What i mean to say is thicker oil is not supposedly preserve the lifelong of already old cars. The first digit of the oil API number is indeed important as its meant to preserve the combustion chamber from premature fatigue and wear.....corresponding to the analysis that most of the wear comes during cold start. the idea of having low first API no. is to have a near to operation oil viscosity for protection during cold start-up. And this is improved and helped by VI improver. As practised earlier...new cars..follow your car manufacturer's reccomendation...others keep on trying....all the best</blockquote>