Quote:
Originally Posted by Steiglitz
KathyRicks, you cite two examples of Toyota engines going mega miles then draw conclusions? Not very scientific, to be sure. Most Toyota engines and for that matter Honda engines and GM engines were in cr@p shape long, long before 150,000 miles and this is because most people do not maintain their engines properly. If you study old UOA reports from years ago, you too will see that conventional oil 10-20+ years ago were cr@p compared to today's Pennzoil Dino Yellow Bottle, for example. Those examples you cite are the exception and not the rule.
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The examples I cited are two of thousands of Toyota engines that have lasted between 500,000 - 1,000,000 miles using a wide variety of brands and weights of conventional oil. Since thousands of Toyota owners have reached that mileage using conventional oil - even using what you consider to be the low quality API "SE" "SF" and "SG" conventional oils that were available 20-35 years ago - a reasonable conclusion is that virtually every Toyota engine that rolls off the assembly line is capable of that kind of mileage if the owner uses conventional oil and practices the similar driving and maintenance habits as the 500,000 - 1,000,000 mile owners.
Used Oil Analysis reports sound objective and scientific but can be badly misleading because the wear numbers don't have much practical meaning. Example: if back in 1975 someone preached to the thousands of future 500,000 - 1,000,000 mile 1975-1995 Toyota owners that use of synthetics would generate "better" UOA wear numbers they'd say: "We don't think those numbers mean much because they fail to educate us about the crucial fact that conventional oil - even API "SE" "SF" and "SG" quality oils - are capable of reliably taking our engines to 500,000 - 1,000,000 miles."