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Message: <blockquote data-quote="Schwepps" data-source="post: 360593" data-attributes="member: 3592">No lah, astro! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" /> In fact overheating the oil is bad. Tis' said that an oil's SAE rating drops within the first 20 hours usage, so an SAE 30 oil becomes less than 30, and SAE 40 oil becomes less than 40 very quickly. Oil that doesn't have enough viscosity is not protecting your engine (it's another myth that thinner oil flows more easily into the tiny spaces - on the contrary, they won't STICK to the tiny spaces) That's what Turbology was talking about when he said better HTHS performance (High Temperature, High Shear) and  NOACK (evaporation of the oil through heat)Sludge is caused by impurities such as sulphur and phosphorus among others. There would more such impurities in G-III mineral oils downwards than in G-IVs.</blockquote>