13,000 Mile Oil Change Interval - 2008 Pontiac G8 GT Long-Term Road Test

2008 Pontiac G8 Long Term Road Test

2008 Pontiac G8 GT: 13,000 Mile Oil Change Interval

December 26, 2009


The oil sensor in our 2008 Pontiac G8 GT finally told us it was time for an oil change. We checked records and the last time we got new oil was 13,000 miles ago! We wanted to send an oil sample off to Blackstone Laboratories to see what they could tell us about the condition of the oil. We wanted to know if the oil was truly done, as the sensor indicated, or whether there was any life left in the slippery stuff.

Our first stop was to look in the owner's manual to see what Pontiac had to say about oil changes.

"When the system has calculated that oil life has been diminished, it will indicate that an oil change is necessary. ... It is possible that, if you are driving under the best conditions, the oil life system might not indicate that an oil change is necessary for over a year. However, the engine oil and filter must be changed at least once a year."

Still, we were curious about the condition of the oil and why the sensor finally went off. We tried to use the "vampire gun" that Blackstone gave us to suck out a sample by inserting a long tube down the dipstick opening into the oil pan. However, we came up dry. We took the G8 to Boulevard Buick Pontaic GMC, in Signal Hill, CA, where the service advisor said the baffle over the oil pan prevented anything but the dipstick from being inserted. We asked him to keep a sample for us while doing the oil change.

By the way, the oil change, inspections and tire rotation was only $39.95. It took them two hours to do the service and clear two recalls. We'll report back on the condition of the oil after we hear from Blackstone labs.

Leave a Comment

Past Long-Term Road Tests

Have a question? We're here to help!
Chat online with us
Email us at help@edmunds.com
*Available daily 8AM-5PM Pacific
Call us at 855-782-4711
Text us at ED411