changed to synthetic oil last fall now oil change light's on

**GottaHaveLS1** · 05-02-2007, 01:56 PM

I changed to fully synthetic oil last year and i've definitely put less than 6,000 miles on it since then. the oil change light comes on at least once a day. I don't really want to do an oil change right away, probably in the summer sometime. the computer can't tell if i have synthetic or regular right? i know synthetic is supposed to go longer without changes. what do you guys think?

**Sarge** · 05-02-2007, 02:02 PM

NEVER make a extended OCI until you have done a few UOA. You need to know what your TBN ( Total Base Number=How much additive is left) is prior to extending your oil change intervals (OCI) and the only way you'll know that is by a Used Oil Analysis (UOA)
Other than that...yes...the GM oil life monitor is based on algorithms that do not have anything to do with the quality of oil left in your sump. Reset it.
Secondly....Get a UOA kit here http://www.dysonanalysis.com/
This will tell you exactly how your oil and your motor is doing.
What oil and filter you running anyway?

**GottaHaveLS1** · 05-02-2007, 03:36 PM

Originally Posted by Sarge

NEVER make a extended OCI until you have done a few UOA. You need to know what your TBN ( Total Base Number=How much additive is left) is prior to extending your oil change intervals (OCI) and the only way you'll know that is by a Used Oil Analysis (UOA)
Other than that...yes...the GM oil life monitor is based on algorithms that do not have anything to do with the quality of oil left in your sump. Reset it.
Secondly....Get a UOA kit here http://www.dysonanalysis.com/
This will tell you exactly how your oil and your motor is doing.
What oil and filter you running anyway?

lots of confusing acronyms lol, i'll have to read this several times. i forgot what oil i'm using, i'll have to get back to you on that. the filter might be bosch but i'm not sure.

**Sarge** · 05-02-2007, 04:26 PM

I spelled out the acronyms for you. Don't go over 5000 miles on any oil until you have a Used Oil Analysis. You may have a silicon or fuel dilution issue and not know it until your bearings go spinning into the atmosphere.

**GottaHaveLS1** · 05-02-2007, 05:08 PM

damn. thanks for the heads up. sorry im kinda buzzed right now haha

**9t8z28** · 05-02-2007, 06:12 PM

Originally Posted by Sarge

NEVER make a extended OCI until you have done a few UOA. You need to know what your TBN ( Total Base Number=How much additive is left) is prior to extending your oil change intervals (OCI) and the only way you'll know that is by a Used Oil Analysis (UOA)
Other than that...yes...the GM oil life monitor is based on algorithms that do not have anything to do with the quality of oil left in your sump. Reset it.
Secondly....Get a UOA kit here http://www.dysonanalysis.com/
This will tell you exactly how your oil and your motor is doing.
What oil and filter you running anyway?

Is there a kit you can buy or do you have to send your oil in to have it tested?