Quote:
Originally Posted by jkv45
Again - same with the heavier oil. It was required back-in-the-day when air-cooled engines would overheat and breakdown the conventional oil. No longer an issue with water-cooling and synthetic oil - but it still continues...
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Instances of overheating, low oil-pressure and inadequate lubrication are still occurring with modern engines, as evidenced by this thread. Sure, it may be happening only a fraction of the frequency of earlier air-cooled engines, but no means completely eradicated.
In that regard, why would you want to run an inadequate oil that doesn't provide sufficient lubrication for your engine during the emergency times when you really need it? Sure, 99% of the time, the extra overhead won't be needed, but that 1% when it occurs will destroy your engine.
Also don't get cold-start viscosity and cold-start flow mixed up with warmed-up engine requirements. Why settle for "good enough" when "way, way better" is available?