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Mix 2 diff coolants?

1K views 2 replies 3 participants last post by  rufushusky 
#1 ·
I put zerex hd elc in it about 4 months ago and I just did an egr cooler delete and I'm low now and I can't find zerex anywhere now can I put rotella hd elc in it to top it off? One is bright red other is bright orange almost red
 
#2 ·
#3 ·
Yeah you can mix EC-1 rated coolants...same basic chemistry. Most ELCs can actually tolerate up to 15-20% non-ELC coolants so you should be just fine mixing a par of ELCs.
 
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