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Old 05-27-2008, 02:28 PM   #1 (permalink)
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Synthetic Motor Oil Change Interval

Now that new car companies are pushing 5000 miles between oil changes with standard 5w-30 blend oil what is the oil change interval for a full synthetic like the Mobil-1 0w-20?

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Old 05-27-2008, 02:52 PM   #2 (permalink)
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I don't know, but both of my Hondas (1996 and 2004) specify 7,500 miles between changes. I've changed to a 10,000-mile interval with synthetic now.
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Old 05-27-2008, 03:29 PM   #3 (permalink)
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If you change less often then acids will build up more in the oil.

http://www.oilanalysis.org.uk/analysisacidity.html

Having the used oil analyzed would tell you if there is going to be a problem.
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Old 05-27-2008, 08:04 PM   #4 (permalink)
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I highly recommend this forum:
http://www.bobistheoilguy.com/forums/ubbthreads.php

It has all the answers wrt to oil. Ask a model specific question wrt to your car and you should get a good interval based on others experience.
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Old 05-27-2008, 08:26 PM   #5 (permalink)
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I use

http://www.blackstone-labs.com/

for oil analysis, I just haven't gotten around to sending in my oil
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Old 05-27-2008, 10:56 PM   #6 (permalink)
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7500 miles seems like a great mileage for all oil changes synthetic or petrolium. I always went 7500 mile intervals with no problems. Draining at 3000 miles seemed like a waste of good oil when it comes out clean and the oil at 7500 just "looked" right to me.
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Old 05-27-2008, 11:37 PM   #7 (permalink)
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Arrow

Yes, BITOG (BobIsTheOilGuy) is an excellent forum for all things automotive that have to deal with fuel and lubricants.

The best short answer is there is no perfect short answer. I saw one oil analysis of a late-model Honda that used the on-board oil-life-monitor system to let him know when he should change his oil. For those of us that regularly get UOAs done (I too use Blackstone Labs) we thought the oil had been pushed too far. It was not a catastrophic result, but what’s the sense in trying to save $10 per year by pushing oil changes out 20% too long?

If you live in an area of the country that is very moist, sees extremes of hot and cold and/or you make frequent short trips, it’s a good idea to change it a bit more frequently. The OLM takes some of these things into account … but then makes a judgement I don’t agree with.

Without UOAs, I’d use 6,000 miles for a “conventional” motor oil and 8,000 for a synthetic such as Mobil 1, Amsoil, Pennzoil Platinum, Castrol Syntec, etc …
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Old 05-27-2008, 11:44 PM   #8 (permalink)
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6k on the Jeep, once the Insight comes online, it'll see 7-10k changes
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Old 05-29-2008, 10:02 PM   #9 (permalink)
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Whatever you do, please don't waste Mobil 1 by draining it at 3,000 miles. Don't go any less than 5,000 unless there are known problems with the engine.

Even if you buy the cheapest motor oil you can get your hands on, it will still do fine in 5k intervals.
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Old 05-29-2008, 10:52 PM   #10 (permalink)
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I ask because I was going for 10K intervals, but many have told me I can go to 15K with no problems. This vibe runs great and has 36K miles on it, I got it with 10K. So I will likely stretch to 10K until evidence proves to the contrary ..

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Thx NoCO2; "The biggest FE mod you can make is to adjust the nut behind the wheel"

I am a precisional instrument of speed and aeromatics
If your knees bent in the opposite direction......what would a chair look like???





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