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Originally Posted by MPGranger
He is not an apprentice, he is a fully certified mill wright.
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Pretty remote from car tech, isn't it ?
Seeing the loggers on Discovery ... even taking into account it's for telly ... hardly representative for car use.
Run it hard until it breaks, then moan about it, seems to be the norm.
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He says that the higher temperatures actually change the molecular composition and weakens the metal.
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Sure, but that only happens at temperatures that'd kill any engine.
You're not getting anywhere near those temps by blocking the grille - given that your cooling system can still cope.
Grille blocks are very much OEM these days ...
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2) Running thinner lubrication. He says that thinner lubes essentially run like water, increasing friction. So this adds excessive heat, which due to thermal expansion increases friction again.
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Thinner weight mostly refers to the cold viscosity.
i.e. 0w or 5w oils.
These actually start to lube an engine FASTER, reducing cold wear and friction at the same time. They till lube, don't worry about that.
Put 20wXX in a modern car engine in a colder climate, and you'll very likely ruin it on the double.
Cars use lower "hot" weight oils due to reduced manufacturing tolerances - and because it reduces friction.
The heavy oils (50,60) won't sufficiently go where they need to, to lube your modern car engine.
His milling equipment may well date a good while back, or be designed in old fashioned "unbreakable" style.
That equipment was easier to fix, and to keep running by adding ever more oil, thicker oil as they wore down, then new rings, resleeving ...
Fact is, modern cars break down ever less because of mechanical engine failures.
The electronics and accessories give up, not so much the engine.
Despite less, and less often changed, thinner oils ...
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3) EOC. Wears out batteries, wears out starters, wears out cooling system, wears out engine.
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Every engine start means extra wear.
Once the engine is thoroughly warm, it won't be a lot though.
Doing so when cold, is not going to be good in the long run.