to avoid losing sale. Most users are not aware that if engines' cooling malfunction, mineral oil will become tar & jam tappets & oil flow. Japanese ( Hyundai too ) cars' water temperature gauges are not calibrated, so most users can only guess how hot their engines get ( esp while climbing steep slopes, in heat waves ), let alone keep eyes on safety margins. Govnmnts should force mineral oil makers to reveal their oil's limits, & car makers to calibrate their gauges.
This has been a known problem for at least 30 years where engines encounter high oil temps because of heat or loading with minimal oil cooling. Most people do not realize that the oil is a major component of engine cooling. During the
1970's/80's GM ran headlong into this problem with recommended 10W40 oils when emission control requirements began to cause cooling problems. The result of this experience among manufacturers has been drastic improvements in oil formulations and standards. There has also been adjustments in oil change intervals, oil SAE viscosity recommendation changes and, the arrival of oil sensors and change reminders in some vehicles. To address your concern, it is always best to change the oil and filter as part of overheating repairs even if it only occured for a short term. If an engine has not overheated, follow the manufacturers recommendations for oil and filter maintenance. There are vehicle out there like some Toyotas that have oil sludging problems from time to time for other reasons that should be addressed hoipefully with design or specification improvements upcoming to prevent these problems.
Government should not interfer in private business with force. Competition and demand will correct problems like this. I have no problem with the governmant making recommendations if they will stick to the applicable science of the subject instead of the politics which is something of which they seem to be incapable.
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