I'm coming up on the first oil change on the new (to me) 2009 Suburban. What do I believe ... the odometer which has 5000 miles since the last oil change, or the computer that says there's still 43% oil life yet?Thanks,Dave

Believe the monitor. Guys have done oil analysis and found the monitors to not only be accurate, but also conservative. Modern EFI and ign systems just don't foul the oil like they used to.

If you're using synthetic, I'd go another 2000 to 2500 miles. If using Dino oil, I'd change it now. My oil life indicator never seems to get below 20% by the time I change my oil. Changing the oil is probably the cheapest insurance for a long lasting engine.

The 2009 manual says 7500 miles unless in a dusty area and that's with dino not synthetic.

I never use synthetic anyway as it's just "soap"

I follow the monitor or go 1 year...which ever comes first. I let it get around 20% sometimes a little less and then change. It's usually about 7-8K miles.Full synthetic here.("soap")....:h

When do I change the oil? | Good Sam Community

24 Replies

travelnutz
Explorer II
Jul 27, 2014
I never use synthetic anyway as it's just "soap"
travelnutz
Explorer II
Jul 27, 2014
The 2009 manual says 7500 miles unless in a dusty area and that's with dino not synthetic.
jfkmk
Explorer II
Jul 27, 2014
If you're using synthetic, I'd go another 2000 to 2500 miles. If using Dino oil, I'd change it now. My oil life indicator never seems to get below 20% by the time I change my oil. Changing the oil is probably the cheapest insurance for a long lasting engine.
ScottG
Nomad
Jul 27, 2014
Believe the monitor. Guys have done oil analysis and found the monitors to not only be accurate, but also conservative.
Modern EFI and ign systems just don't foul the oil like they used to.

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When do I change the oil?

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