OLM vs annual change - Duramax with DELO 400 15W-40 in it

Joined
Jul 6, 2003
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Boise, ID
I have a 2006 Chevrolet with the 6.6 Duramax diesel engine. I have been using DELO 400 15W-40 in it since I bought it, changing annually or more frequently if noted by by the OLM. I have not been putting many miles on the truck lately and it is coming up on a year since I did. The OLM still shows 80%. I have read where oil manufacturers recommend changing at 12 months. What would you guys do? Change when the year is up? Change when the OLM gets closer to 0% (that could be a few years based on usage)?

I have fresh oil and filter ready to go.
 
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Jan 17, 2003
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9200' Colorado
If it's run at highway speeds or even just around town for a half an hour once in a while I'd run it to at least 5000. If it's just short tripped all the time I wouldn't change it before 3000. I just don't get excited about time limits with today's oils, but that's just me.
 
Joined
Jan 1, 2003
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Daytona Beach
The OLM should have time in its algorithm, so it should be ok to still go by that. However, most of us I think consider two years as max time on oil. If it were mine, I'd go by the OLM for up to two years.
 
Joined
Oct 22, 2009
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Wet side WA
I have a 2006 Chevrolet with the 6.6 Duramax diesel engine. I have been using DELO 400 15W-40 in it since I bought it, changing annually or more frequently if noted by by the OLM. I have not been putting many miles on the truck lately and it is coming up on a year since I did. The OLM still shows 80%. I have read where oil manufacturers recommend changing at 12 months. What would you guys do? Change when the year is up? Change when the OLM gets closer to 0% (that could be a few years based on usage)?

I have fresh oil and filter ready to go.
My 2006 Duramax has only been going 2000 miles a so a year on Rotella T6. I reset the OLM and run it another 6 months the last two OCI's.
 
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