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What interval do you use for changing your oil?


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Gamera The Atomic Turtle
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Discussion Starter #1 (Edited)
i was wondering when people are changing there oil, i know track day folks do it after each track day or after the weekend, was wondering about the street cars.

I was thinking the most likely choices are 3k miles, 5k miles, and 7.5 k miles.
 

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If the car is in the air anytime between 3500-4500 miles I change the oil. If I have gone more than around 4500 miles, I go ahead and change it.

Probably a bit excessive, but I figure it doesent hurt anthing and I dont mind doing it. It only costs me about 25$, well actually its a bit more now that I have a gpan that holds 6 quarts.

I change my daily drivers oil 2x per year and I drive about 12k per year.
 

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Gamera The Atomic Turtle
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Discussion Starter #6
thanks - i wanted to see all the variations.
 

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I do a visual/sniffer test on mine every time I check it. When it's needed, it gets changed. I don't count the miles on any of my vehicles.
Zuki what are you smelling for? Burnt smell, fuel smell...what? Also what signs are you looking for, dirtiness only?

Thanks, just curious.
 

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I do every 3k. Since the oil change doesn't get all the oil (lots left in the cooler lines) I like to change it more often.
 

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I track my car so I do it ever 500 miles :)
However I normally NEVER go over 3,000 miles if I get that long before my next track event, simply because a $40-$100 oil change is good insurance to not blow up a couple thousand dollar motor plus it drives better after an oil change.
 

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Ihave put about 2800 miles on her since I got her (11000 is on the car) and I have changed the oil twice. Typically I would go about 2000 miles on this type of car but with the extra hose and oil coolers not being drained I chose about 1500 as a target. Kokimo you have the ideal setup with the cooler relocated and I would assume since you can drain your entire system you should target 5000 unless you start tracking.
 

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Gamera The Atomic Turtle
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Discussion Starter #12
ya - i'm at 5k intervals right now...
 

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Ihave put about 2800 miles on her since I got her (11000 is on the car) and I have changed the oil twice. Typically I would go about 2000 miles on this type of car but with the extra hose and oil coolers not being drained I chose about 1500 as a target. Kokimo you have the ideal setup with the cooler relocated and I would assume since you can drain your entire system you should target 5000 unless you start tracking.
SG, what is your cars setup? Turbo and/or Supercharger? Lots of stop and go driving? Lots of very short trips? Tracking the car?

I suspect that if you would send a sample off to be tested you would see that at 1500 there is LOTS of life left in the oil. YMMV.
 

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German Reimport
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About every two years or 7500 miles, whatever comes first.
OEM's typically go on the very safe side when they determine their oil change intervals.
They always have to assume the worst conditions regarding many things like load profiles, fuel quality, dust and such. And under those worst case conditions the oil change interval they recommend must still be on the safe side.
So yes, most people change their oil way too often - trust me - I'm responsible for releasing factory fill oils for one of the big ones and I also deal with determining service oil change intervals on an almost daily basis ;)
 

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SG, what is your cars setup? Turbo and/or Supercharger? Lots of stop and go driving? Lots of very short trips? Tracking the car?

I suspect that if you would send a sample off to be tested you would see that at 1500 there is LOTS of life left in the oil. YMMV.

I know I change oil too soon but running at high rpms and only getting half the oil out during a change I figure cheap insurance. My dune buggy gets changed at 1000 miles but she is my wheelie machine and runs high rpm and gets pushed to the limit every time I drive it.
My truck gets changed at 5000 with a 1000 mile flush every 25000. I know oil these days last longer before breaking down but it is cheap insurance. And I always ecycle spent oil.
 

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I know I change oil too soon but running at high rpms and only getting half the oil out during a change I figure cheap insurance. My dune buggy gets changed at 1000 miles but she is my wheelie machine and runs high rpm and gets pushed to the limit every time I drive it.
My truck gets changed at 5000 with a 1000 mile flush every 25000. I know oil these days last longer before breaking down but it is cheap insurance. And I always ecycle spent oil.
There are tests posted that show no difference in oil that is changed early compared to oil changed at the recommended interval.

It is the heat that causes breakdwown in oil, but synthetic is very durable. In time the gases produced from the heat will break down the oil, but the manufacturer already knows this when when recommending.

Besides high performance driving, there is no need from deviating from the manufacturer recommendations.(true high performance driving)

Even jiffy lube is on record Saying 3000 is unnecessary.
 

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Gamera The Atomic Turtle
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Discussion Starter #17
ok - so even with a supercharger w/mild boost, street car, getting on it once a day during a drive around town - still the same intervals? I wonder how long it will take to put something in my catch can.
 

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3000 miles for me. I think 3000-4500 is appropriate. I usually change my oil 2-3 times a year and it costs me less than $100 a year. Fresh oil is just peace of mind for me and I don't really care if changing it every 3000 miles is excessive.
 

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It's a lot like pornography for me. I can't define it, but I know it when I see it. Regardless, I wish all my cars had something similar to the Benz system...

DaimlerChrysler Corporation Flexible Service System
DaimlerChrysler’s version of the oil monitor is called ASSYST in Europe and the Flexible Service System (FSS) in the United States. The FFS uses a computerized system to track multiple engine operating conditions. From research on oil quality through the span of an engine’s life, Daimler discovered that the breakdown in oil is determined by such factors as driving habits (frequent short trips vs. long trips), driving speed and failure to replenish low oil levels. Therefore, the FSS monitors time between oil changes, vehicle speed, coolant temperature, load signal, engine rpm, engine oil temperature and engine oil level. It uses this information to determine the remaining time and mileage before the next oil change and it displays the information in the vehicle’s instrument cluster.

In addition, Daimler discovered that oil degradation is correlated directly with its ability to conduct electric current. Therefore, Daimler has fitted V-6 and V-8 engines with a digital oil quality dielectric sensor, that is mounted above the oil pan along with an analog oil level sensor. This sensor measures changes in capacitance, which effectively is a proxy for the amount and type of contaminants and oil degradation products present in the oil. An increase in dielectric constant (less resistance to electrical flow) indicates oil contamination and degradation.

Daimler-Benz (Mercedes-Benz) has been incorporating the sensor into its vehicles since 1998.
 
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