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2nd Generation
best oil?
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<blockquote data-quote="Tex Arcana" data-source="post: 11451105" data-attributes="member: 15892"><p>Or that our engines are actually designed to use the 5w20, and the use of anything else compromises what the oil is SUPPOSED to do? </p><p></p><p>Which is more than just lubricate: it's there to cool the bearing surfaces and internals of the crank, the cams, the rods, the wrist pins; it's there to keep the bearing surfaces apart as well; and to carry contaminants away and (hopefully) trap them in the filter, or evaporate them into the PCV airstream (see the connection?). </p><p></p><p>Also note that most oil coolers are inside the radiator: this is so the temperature of the oil is controlled and kept at optimum temperature for maximum lubricity and flow. Heavy oils tend to not flow well, which compromises all sorts of things in the engine, and could lead to bearing starvation, oil breakdown (because it overheats in the bearing spaces and breaks down), and eventually bearing failure. </p><p></p><p>Today's cars are being designed to runs on even thinner oils, mostly because these oils resist breakdown far better than their ancestors ever could. The thinner oil allows tighter tolerances, more flow, better lubrication, better cooling, and better bearing surface control. </p><p></p><p>So don't diss the original oils: our motors were specifically designed for them; so unless you've built a motor designed for 20w50, it's not a great idea to use it. 10w30 isn't so bad, because it's just the upper end of the range where it extends, which can be helpful in very hot and stressful environments (and it's not so far out of range that it will compromise lubricating/cooling performance).</p></blockquote><p></p>
[QUOTE="Tex Arcana, post: 11451105, member: 15892"] Or that our engines are actually designed to use the 5w20, and the use of anything else compromises what the oil is SUPPOSED to do? Which is more than just lubricate: it's there to cool the bearing surfaces and internals of the crank, the cams, the rods, the wrist pins; it's there to keep the bearing surfaces apart as well; and to carry contaminants away and (hopefully) trap them in the filter, or evaporate them into the PCV airstream (see the connection?). Also note that most oil coolers are inside the radiator: this is so the temperature of the oil is controlled and kept at optimum temperature for maximum lubricity and flow. Heavy oils tend to not flow well, which compromises all sorts of things in the engine, and could lead to bearing starvation, oil breakdown (because it overheats in the bearing spaces and breaks down), and eventually bearing failure. Today's cars are being designed to runs on even thinner oils, mostly because these oils resist breakdown far better than their ancestors ever could. The thinner oil allows tighter tolerances, more flow, better lubrication, better cooling, and better bearing surface control. So don't diss the original oils: our motors were specifically designed for them; so unless you've built a motor designed for 20w50, it's not a great idea to use it. 10w30 isn't so bad, because it's just the upper end of the range where it extends, which can be helpful in very hot and stressful environments (and it's not so far out of range that it will compromise lubricating/cooling performance). [/QUOTE]
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