Coolant change, what do you use?

[Wacky]

Engine design appears to play a critical role. I have a TDI Jetta Wagon. I have never heard of a cavitation issue on a VW. I also have a 7.3L E350. Those engines, particularly the indirect injection ones, have a significant caivitation issue. I even received a letter from Ford reminding me to ensure adequate supplemental coolant additive on my IDI van. My current direct injection van never warranted a letter from Ford. Nevertheless, I religiously maintain my molybdate and nitrate levels in the coolant of that one, just in case. I always wonder if the lower compression level in the direct injection motors made the problem go away.

I've never really done much on my GC2300 other than periodically change the coolant. Never added an SCA. Compared to over 1,000,000 7.3L engines and likely even more VW TDIs sold, the Iseki does not have a lot a owner experience. Has anyone ever heard of cavitation on a small bore engine? My gut says small engines experience less cylinder wall flex and hence less cavitation.

By no means do I know everything there is to know on the subject, I do know of a few different engine designs/series/ect from a few different brands that were all proned to cavitation and/or electrolysis (sp??). All those were in-line 4 or 6 cylinder, cast iron block, WET SLEEVE engines. In every instance (with the engines I'm familiar with) they ALSO had a history of "dirty castings" (as far as the water jackets). Rust particles played some role in the erosion of the sleeves. As I said, that's with a hand full of engine types.

Hmmmm, interesting.