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Message: <blockquote data-quote="t2ribena" data-source="post: 406757" data-attributes="member: 3847"><p>With a multigrade oil, temperature greatly effects the viscosity and there is also the non-newtonian behavior in varying strain rate as well as the stability of the oil film...for example, with the TWS or high range mutigrade oil which is assumed to be highly viscous at all operating range, let say at the rod bearing site, at high rpm, varying strain rate...at this condition as Albundy pointed out, the localized temperature at the site is extremely high with high viscosity oil and at the present condition with high temperature, the viscosity of the oil and its straining strength is lowered at that site which might cause problem...well this is just a possibility that would explain why some engine with TWS also experiences bearing damage and some with normal 5W-30 oils does not...</p></blockquote><p></p>