I'm assuming the 190D's are as reliable as the 300D's, but how about parts availability? Are parts easier to come by, more difficult, or what? Also, are the heads cast-iron or aluminum?

I'm starting to seriously think that, for my use for the car (freeway commuter), a 190D would be better for me than a 300D...especially 'cause you can get a 5sp with the 190D I like the apparent average mileage numbers over the 300D's numbers...

Thanks!

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2001 VW Jetta TDI, 5 speed, daily driver
1991 Ford F-350, work in progress
1984 Ford F-250 4x4, 6.9l turbo diesel, 5 speed manual
Previous oilburners: 1980 IH Scout, 1984 E-350, 1985 M-B 300D, 1979 M-B 300SD, 1983 M-B 300D
Spark-free since 1999