Viper wrote:Source of the post
The contamination is a result of the byproducts from the combustion process regardless of carbed or injected. Some of the byproducts are corrosive so you don't want some internal engine component surfaces sitting in that soup for very long, especially in a static state such as during winter layup. The damage doesn't happen in one winter but is accumulative and may become a problem over time.
....
While I generally agree with your post, that first line is a bit misleading. Only some of that contamination is due to the combustion products and even some of those combustion products were much worse with carbs over open-loop injected engines, and open-loop injected engines are even worse than closed-loop injected engines. You can see evidence in this in the oil change intervals in cars when they made the migration from carbs to open-loop to closed loop. You could never run a carb engine with 10K or 20K mile change intervals, but it's not unusual in closed-loop systems and this is largely due to the contamination in the oil being greatly reduced.
It's not the filterable products or the 'dirtiness' in the oil that's generally the concern, it's the contamination that may not be visible that can cause significant long-term damage.