On my '07 6.0 I switched over to John Deere Coolgard at 90,000mi. due to a stuck thermostat, I the flushed system
coolant has 30,000mi. on sample (Approx 1 year)
Coolscan Plus lab
12/18/10 date of sample
lead........................ iron........................ aluminum.....................1
copper......................
visual appearance
clarity...............clear
petroleum layer.......,none
sediment...............none
color.................green
physical/chemical
glycol content...........%52
reserve alkalinity.......2.4
additional
freeze point.............-40 (refractometer)
pH.......................7.8 (D1287/meter)
Nitrites...........ppm 1354 (Titrimetric/IC D5827)
molybdate................775
Silicates..........ppm 328
test results indicate no action required
I have had no cooling system issues with this truck, also there is a bypass coolant filter installed.
coolant has 30,000mi. on sample (Approx 1 year)
Coolscan Plus lab
12/18/10 date of sample
lead........................ iron........................ aluminum.....................1
copper......................
visual appearance
clarity...............clear
petroleum layer.......,none
sediment...............none
color.................green
physical/chemical
glycol content...........%52
reserve alkalinity.......2.4
additional
freeze point.............-40 (refractometer)
pH.......................7.8 (D1287/meter)
Nitrites...........ppm 1354 (Titrimetric/IC D5827)
molybdate................775
Silicates..........ppm 328
test results indicate no action required
I have had no cooling system issues with this truck, also there is a bypass coolant filter installed.