This is for an 07 Spartan mountain master chassis - 8.9L cummins ISL. I bought the RV used a year ago - and of course no documentation on what coolant is being used... This is not the original coolant, but that's all I know.
Sent my coolant out for testing - came back calling for a change.
BUT - I know all the different coolants OAT, ELC, etc, etc aren't all compatible - so I'd like to drain and refill with as much of a compatible coolant as is reasonable. (of course if that isn't possible I'll do a drain, flush and refill)
Ideally I want to go to an easily obtainable OAT coolant - I love the fact that I can swing by walmart and pickup final charge...
So - what's in there now is yellow - no SCA - a small amount of nitrite and some moly. I suspect this would have gone in the motor based on previous owner turnover somewhere between 2013 & 2016.
I've topped up with ~1/2 gallon of distilled water in my year of ownership and a short term previous owner could have possibly tainted an otherwise non-nitrite coolant with a top up as well to further muddy the waters...
My best guess is Shell Rotella Ultra ELC with a top up of a nitrite coolant afterwards.
What are other options that might better fit the test results in there? Any thoughts/suggestions are much appreciated.
Sent my coolant out for testing - came back calling for a change.
BUT - I know all the different coolants OAT, ELC, etc, etc aren't all compatible - so I'd like to drain and refill with as much of a compatible coolant as is reasonable. (of course if that isn't possible I'll do a drain, flush and refill)
Ideally I want to go to an easily obtainable OAT coolant - I love the fact that I can swing by walmart and pickup final charge...
So - what's in there now is yellow - no SCA - a small amount of nitrite and some moly. I suspect this would have gone in the motor based on previous owner turnover somewhere between 2013 & 2016.
I've topped up with ~1/2 gallon of distilled water in my year of ownership and a short term previous owner could have possibly tainted an otherwise non-nitrite coolant with a top up as well to further muddy the waters...
My best guess is Shell Rotella Ultra ELC with a top up of a nitrite coolant afterwards.
What are other options that might better fit the test results in there? Any thoughts/suggestions are much appreciated.
Last edited: