That just is not true.
When you start the engine the amount of wear on every internal moving part is increased at lower temperatures. That is true for any temperature below normal operating temperature, and for any kind of oil. However, the amount of wear is insignificant until the temperature drops well below normal operating temperature, and is not really worth concern until it is perhaps
10 or 20 degrees below freezing. It is also true that different types of oil have different effects. Clearly synthetic oil is better than non-synthetic oil for cold starts, and the colder the starts, the more benefit from the synthetic oil.But at the extremes for whatever type of oil you use, it just is not smart to start a cold engine. Somewhere between +20F and -20F almost every non-synthetic oil becomes jelly-like in consistency. But even synthetic oil does not flow well at -50F. In either case, if the oil has not been pre-heated, and the engine parts are cold, there is no lubrication until several minutes after the engine is started. That *does* cause greatly increase engine wear.
Generally that is probably true. Power steering hoses tend to burst from cold starts, but most everything else works well enough with the exception of belts. In places like Fairbanks Alaska where it is often -30F to -50F, the first cold snap of the year is always cause for a lot of "highway snakes" being seen. Every old fan belt breaks the first day. And of course a cold day is the *wrong* day to replace belts. A brand new, stiff, belt is almost as likely to break as an old worn out belt!
Pre-heat your engine if it is colder than 10F, and use synthetic oil.
How much cold starting do you do?
25,000 miles???? That's ridiculous.That isn't true.
Why should it fail that soon? (Cold starting!)
There is no reason an engine should only last 100,000 miles. If fails that soon, or anywhere near it, it has been abused.
It is indeed interesting. It's also difficult, because everyone has a different idea of what is "cold", what is "premature wear", and what is "the right oil".
-- Floyd L. Davidson Ukpeagvik (Barrow, Alaska) snipped-for-privacy@barrow.com