Best coolant options for '91 Cummins 5.9

Reply Subscribe

Thread Tools

Search this Thread

Aug 12, 2011 | 01:23 PM

KLJ

Thread Starter

Newbie

Joined: Aug 2011

Posts: 2

Likes: 0

Best coolant options for '91 Cummins 5.9

I'm reading up on best coolants to use in my '91 Cummins 5.9. Any tips from users appreciated and why you're using over other types/brands.

Aug 12, 2011 | 08:18 PM

Billy D

Diesel Bomber

Joined: Nov 2009

Posts: 1,026

Likes: 45

From: Ohio

I like the green stuff

Aug 13, 2011 | 01:48 PM

Gas

Diesel Enthusiast

Joined: Apr 2011

Posts: 122

Likes: 6

Get the Peak "Original Green" or else the other green colored stuff will just be the long-life stuff that can sludge up easily. I'm glad Peak still makes stuff us older trucker owners can use.

Aug 13, 2011 | 11:38 PM

Chevy72

Diesel Fan

Joined: Jan 2011

Posts: 76

Likes: 4

From: Northern Ca

Just make sure the bottle says 'for diesel engines' almost all coolants are formulated for both gas and diesels now. and make sure to get ALL the air out of the system when you fill it or you have major problems down the road.