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Message: <blockquote data-quote="planta" data-source="post: 273075" data-attributes="member: 7799">Hi FamyGood article, thanks. Most of these guys use Petronas petrol. If I refer to the below quote from the article, it does support the simple theory that prolong use of engine oil will cause sludge. I believe engine oil has its distinctive qualities and limitations. 25,000 kilometers for engine oil change is too long.planta"Pennzoil, and some other quality motor oils, are able to perform this task more effectively and for longer periods of time. But eventually, if the oil is not changed often enough, a "breaking point" will be reached.""running the engine low on oil for a prolonged period of time can cause sludge. The detergent and oxidation inhibitors are important components of the additive package that prevent sludge from forming. When an engine is run low on oil, these additives have to work overtime to do their job. There is simply less of the additive package available to do the work of suspending particles and preventing oxidation (thickening) of the oil."</blockquote>