How often you change your synthetic oil? - Mazda 6 Forums : Mazda 6 Forum / Mazda Atenza Forum
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post #1 of 13 (permalink) Old 06-04-2004, 11:13 PM Thread Starter
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How often you change your synthetic oil?

I did mine every 5000 miles. Mixed driving on highway and city. Is that ok?:sarc I am at about 10,000 miles now. I have did my 3rd oil change since I got my car.
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post #2 of 13 (permalink) Old 06-04-2004, 11:23 PM
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Reading Topic: How often you change your synthetic oil?

In the summer, I am doing it once a month because of the extreme heat. Hot diggity the AMB temperature guage in the car said 122 degrees today.

I prefer 3000 miles usually, never hurts to have fresher oil in your car.

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post #3 of 13 (permalink) Old 06-04-2004, 11:27 PM Thread Starter
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Reading Topic: How often you change your synthetic oil?

Wow 122 degree! and once a month!! you must like ur car so much! Don't u think there is a liitle bit too much considering syn oic is about $4 per quart and we need like 5.5 quart per oil change. Well I am just wondering if it is ok if I change every 5000 miles or every 4-5 months if I am using Mobil 1 syn 0W-20.
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post #4 of 13 (permalink) Old 06-04-2004, 11:34 PM
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Reading Topic: How often you change your synthetic oil?

I think its fine for where you live. After a month here, the 0w-20 of mine turns into water.
Heck manual says 7000 miles which i think is crazy.

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post #5 of 13 (permalink) Old 06-04-2004, 11:42 PM
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Reading Topic: How often you change your synthetic oil?

I do mine every 5,000 with Mobil 1 0W-20.

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post #6 of 13 (permalink) Old 06-05-2004, 12:58 AM
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Reading Topic: How often you change your synthetic oil?

Mobil 0w-20,every 4000 miles. I do a lot of city driving.

2003 Onyx Black 6s atx, B&M 13,000 btu tranny cooler, AEM cai, AEM Dryflow filter, Fumoto valve, CP-E Wishbone mount, Throttle Body coolant bypassed......
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post #7 of 13 (permalink) Old 06-05-2004, 02:24 AM
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Reading Topic: How often you change your synthetic oil?

Around 4000 miles, but it really could go longer with no problem. And yes I use mobil synthetic.
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post #8 of 13 (permalink) Old 06-05-2004, 03:35 AM
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Reading Topic: How often you change your synthetic oil?

With quality oil and a quality oil filter 7000 mile intervals is not a problem.

I personally change mine in my cougar every 3500-5000miles depending on season, temp, driving type, etc.

Synthetics can usually go long between changes, however using a good oil filter will definitely prolong the oil's life.
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post #9 of 13 (permalink) Old 06-05-2004, 03:46 AM
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Replying to Topic 'How often you change your synthetic oil?'

I go with 7500 miles, but not because that is the factory recommended interval. The only way to determine the maximum effective OCI (oil change interval) is with a UOA (used oil analysis). UOA allow you to monitor the wear levels and also determine the amount of active additives left in the oil. The oil used, filter used, weather conditions, driving habits and other factors can all influence how long you can go between changes.

My car seems 90% of it's miles on the freeway. 5 miles to the freeway and 40 miles on it, and back every day. With this type of usage, a Motorcraft filter and Castrol Syntec 0-w30 oil, my UOA indicated excellent wear and additives in reserve with a 7500 mile interval. Realistically, I could feasible go even longer, but I won't while the car is still under warranty.

In general, I'd say that dumping a load of Mobil 1 with only 3000 miles on it is silly. If you are of the 3000 mile OCI school of thought, just us a good dino oil. Seeing as my car sees over 2000 miles/month, syn makes a lot of sense for me.

Regarding oil filters, I think the super fancy oil filters are a waste of money. Some do filter a little better than others, but they usually trade off flow for the extra filtering, thereby lowering oil pressure. Really, as long as the anti-drainback valve is working right, I think that any difference is engine wear attributable to different spin-on filter are minute. Bypass filters are a different story altogether. These filters can extend OCIs to incredible lengths, 20000-30000 miles with good oil is easily possible.
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post #10 of 13 (permalink) Old 06-05-2004, 11:07 AM
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Reading Topic: How often you change your synthetic oil?

I concur with pisadong. The only way to know what OCI interval is best for your application is with a Used Oil Analysis.

Where do you get a used oil analysis?
http://www.blackstone-labs.com/

You can get a free test kit to collect a sample at your next interval. Cost is 20 dollars. Think of it as blood work for your engine.

Want more info on oil?
http://www.bobistheoilguy.com

Want more info on oil applications for the 6?
http://www.mazda6tech.com/index.php?option...id=26&Itemid=36

http://forum.mazda6tech.com/viewtopic.php?t=68
http://forum.mazda6tech.com/viewtopic.php?t=57&start=0
http://forum.mazda6tech.com/viewtopic.php?...p?t=624&start=0

The stock factory fill of motorcraft 5w-20 semi-syn can go around 4,000 to 5,000 miles before its additives start depleting. Combined with the Motorcraft FL820-S, its an excellent filter/oil combination thats very inexpensive. (1.40 qt @ wallmart, about 1.60 for the filter).

If your running synthetic, your minimal interval should really be around 5,000 miles, unless your specifically track racing, or doing something abnormally hard on your engine/drivetrain....in which case your probably also running an oil cooler and bypass filter anyway.

Mobil 0w-20 and 0w-30 German Castrol have both been shown to go to 7500 mile intervals without issue or problem (with TBN numbers still indicating the interval could go longer if need be)
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