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How long does a synthetic oil change last?- Time not Miles

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Old 10-25-2006, 03:29 PM
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Default How long does a synthetic oil change last?- Time not Miles

STFA, but didn't get a good answer.


Once I change my oil, how long is it good for? I'm looking for Time not Miles here.

I've been changing my own oil for a little while now, but since I got a daily driver I haven't put anywhere close to the miles I used to on the car. So now it seems that it takes me a few months between oil changes and I know when I used to get it done at the dealer they would have a Date of expiration for my oil change.
Old 10-25-2006, 03:31 PM
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Get it analyzed and pay for the additional testing (I forget what it's called).
Old 10-25-2006, 03:32 PM
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Default daily driving is harder on oil than highway.

just becasue you are driving low miles doesnt mean the oil is ok for longer.
Old 10-25-2006, 03:41 PM
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i change mine every 3K miles no matter what, i use M1 0W40 everytime
Old 10-25-2006, 03:45 PM
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Default I would suggest 6 months as maximum time, 5k miles (just to give you perspective on my way of

thinking about oil changes). With these engines, I wouldn't leave Motul or anything else in there for 10k miles, regardless of what anyone else says.
Old 10-25-2006, 04:04 PM
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Default Blackstone Labs

<ul><li><a href="http://www.blackstone-labs.com/">linky</a></li></ul>
Old 10-25-2006, 04:04 PM
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Beat me 2 it.
Old 10-25-2006, 04:33 PM
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Default My car is not a daily driver and I change the oil once a year and I also got blackstone lab test ...

to check the oil. They found the oil to be in top shape and told me that time with synthetic is not as big of an issue as with dyno. I sent the oil in with 3400 miles 10 months of use and they told me to go 5000 miles and check back.

Hope that helps.
Old 10-25-2006, 04:33 PM
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Default about a year - max

I drove 4k last year on synthetic (live very close to my work), got the blackstone analysis done and it was stil within tolerences.
Old 10-25-2006, 05:12 PM
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Default I used to be a 3k miles guy. I now have ~5,500 miles and over 6 months on current oil...

Will be changing it in ~500 miles and send sample to Blackstone for analysis. This 6,000 miles included several track days as well.


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