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OIL CHANGE INTERVAL

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Old 03-26-2009, 07:23 PM   #1
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Default OIL CHANGE INTERVAL

I've heard the general rule of thumb was change the oil at every 3,000 miles. I have recently heard that 5,000 miles is the new "thing" to do, but would that be for newer engines with less mileage, meaning older engines would benefit more with more frequent oil changes?
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Old 03-26-2009, 10:52 PM   #2
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i just got done talking with a guy who swears by Mobil1 and says he changes it every 10k miles and been doing it for years. I dont know about that, but the car does have 110k on it. I change mine every 3000 miles nomatter what. The fresher the oil is the better it lubricates. I think that if you race the car at all you should do the same thing. But if this were an everyday grocery getter that never saw above 3k rpm then i would change it every 5k...
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Old 03-27-2009, 02:58 PM   #3
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I've heard the same thing about modern engines only requiring oil changes every 5K miles.

I even saw a can of oil that said change every 10k...But I'm too OCD about my engine to go that long, 3k just seems safer for me; it's been the rule of thumb for a looooooong time.
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Old 03-27-2009, 03:35 PM   #4
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+1 to the above posts, 3k for my stang. for my d/d's (01 dakota, 08 escape and the kids cars) i stretch it out 3500 to 4000 though.

what i always wondered is the time interval. they say 3 months or 3 k whatever comes 1st. which isnt an issue on my d/d s , but i only put maybe 800 miles in 3 months on the stang. another issue is, it hibernates for 5 months so do i change it when it hasnt even been run ?
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Old 03-27-2009, 05:06 PM   #5
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+1 to the above posts, 3k for my stang. for my d/d's (01 dakota, 08 escape and the kids cars) i stretch it out 3500 to 4000 though.

what i always wondered is the time interval. they say 3 months or 3 k whatever comes 1st. which isnt an issue on my d/d s , but i only put maybe 800 miles in 3 months on the stang. another issue is, it hibernates for 5 months so do i change it when it hasnt even been run ?
IMO the "3 month" thing is just an attempt to scam you out of money. I only put 5000 miles a year on my car and theres no way in hell it needs oil changes 4 times a year. But, if the car has been sitting for 5 months, I would change it.
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Old 03-27-2009, 05:40 PM   #6
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ok, so i should just go by the mileage then?
and since my car only goes about 2,000 miles a yr, i should change it once a year ? when i do change it, when is the better time, before storage or after ?
keeping in mind i run full synthetic but im blown and go to the dragstrip about 5 times a year.
thanks mustangcat
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Old 03-29-2009, 03:35 PM   #7
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There is a whole lot to oils that most people (including those in this thread) do not know.

When you are talking about oil change intervals.. the 3000 mile "standard" was a requirment to one of the ratings of oil. You should go by the recommendation in your owners manual.

Newer oils have been made to tighter standards and requirements than those of years back. The more "pure" an oil is, the better it will last. 3k miles is just a nice happy number that gets thrown around. Sorta like calling a facial tissue a "Kleenex"!

As for the guy who says his friend uses mobil1 and changes it every 10k miles... Your friend is a ****ing retard.

Although mobil1 may have been one of the first synthetic oils on the market... they are hardly the best one out there.

If you dont believe me, check out the viscosity index on the mobil1 oil and compare it to the rating of Kendall GT-1 Ultimate Synthetic.... I'm sure you will be in for a little suprise
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Old 03-29-2009, 10:25 PM   #8
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Part of the reason you change 3k OR 3 months is that the oils have certain detergents in them that break down after that kind of interval. One reason to do it often, as well as to eliminate gunk
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Old 04-01-2009, 10:03 AM   #9
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Season drivers vs yearly drivers, I change every 4k, time means nothing only because my miles are short cyclical heat and cool miles. If I were to drive it only for the summer/good weather I would only change it after the season was over, fresh oil I doubt will breakdown sitting in the pan over the winter as I doubt it will breakdown in a container. I am no expert but I try to think about cost vs benefit. Full synthetic is what I use and have never had a problem with any engine I broke in and fully maintained. My first car was to get it's oil changed 12k or once a year which ever came first. Things have changed since then but the laws of friction remain the same, oil is your best protection, expect the best if you use the best.
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Old 04-02-2009, 05:27 AM   #10
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I go 5000 miles between oil changes. I use ester based synthetic oils though. I've gone 5000 miles on petroleum based synthetic oils before and the oil didn't look that bad. I guess I'm a f*cking retard then.
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Old 04-02-2009, 07:56 AM   #11
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I was involved in oil sampling and analysis for years. Typical rule of thumb if you're not having your oil analyzed:

Dino: 3,000 miles or 6-8 months
Blend: 5,000-7,000 miles or 8-12 months
Full syn: 8,000-10,000+ miles or 1 year+

You can extend these frequencies by having your oil tested but IMO, testing is more hassle than it's worth. If I have to be under the car pulling a sample (which is a bit of a science in itself) I might as well reset the clock by changing the oil. Also, driving style (frequent short trips, racing, etc) will dictate modification to the rule-of-thumb.

I've owned 13 vehicles; 4 of which I sold with over 200,000 miles and 7 with well over 100,000 miles. The other 2, my Stang and my SUV, are fairly new. I've used dino and I've used full synthetic using the above "rule-of-thumb" and never had a vehicle that used oil or had any wear-related issues or problems. None. They all ran like a top.

Whether it's dino, blend or full synthetic, providing you perform oil changes at a frequency suited for that oil, they ALL PROVIDE AN EQUIVALENT AMOUNT OF PROTECTION, period.
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Old 04-05-2009, 12:00 AM   #12
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i do 5K miles on all my vehicles with mobil 1 synthetic. if you really are concerned, i'd suggest getting a sample tested through blackstone. i've used them off and on for years. i don't do it every time but a couple times a year i'll send in a sample. there's a separate test they do if you want that will tell you the life in your oil at the time you changed it. they then will make recommendations on mileage between changes. oil today whether it's synthetic or not does not have to be changed every 3K. it's just a waste of oil and money.
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Old 04-05-2009, 04:41 PM   #13
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Quote:
Originally Posted by USMC1775 View Post
Part of the reason you change 3k OR 3 months is that the oils have certain detergents in them that break down after that kind of interval. One reason to do it often, as well as to eliminate gunk
Well I'd figure those detergents and additives only break down when their in use; being juggled around, pushed, slammed, squeezed and heated in the engine. When the engine isn't running it's basically a sealed environment, so those ingredients won't be stressed.
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Old 04-06-2009, 03:40 PM   #14
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I do mine every 5k miles with mobil 1 5W20. When I pull it out its usually not too bad. For says 5k miles on the synthetic blend... I wouldnt do it with the blend really but its not that big of a deal. With it costing about 30 dollars to change my oil with Mobil 1 its not worth it for me to go over 5k because 5k is usually 6 months on my car.
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Old 04-15-2009, 09:37 PM   #15
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Quote:
Originally Posted by GTCritter View Post
i do 5K miles on all my vehicles with mobil 1 synthetic. if you really are concerned, i'd suggest getting a sample tested through blackstone. i've used them off and on for years. i don't do it every time but a couple times a year i'll send in a sample. there's a separate test they do if you want that will tell you the life in your oil at the time you changed it. they then will make recommendations on mileage between changes. oil today whether it's synthetic or not does not have to be changed every 3K. it's just a waste of oil and money.
Funny you mention that, I just stretched my change to 7,500 with Mobile 1 and I'm sending it to Blackstone and having them do a TBN... I'm interested to see the results.
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Old 04-27-2009, 04:45 PM   #16
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I have a case of Amsoil full synthetic for my 2004 GT it states 25,000 mile/one year oil changes (when used with amsoil EaO synthetic oil filters). I have mobil 1 synthetic in now but I will be switching to amsoil next oil change I will prob go 8000 miles or less between changes not 25000 though lol.
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Old 04-29-2009, 12:31 AM   #17
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Around every 5000 miles I'll change my oil.
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Old 05-23-2009, 11:31 AM   #18
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I use petroleum-based oils and just go by the color of the oil. If the oil is pretty dark I'll change it. It's amazing how much carbon gets in there after only a few thousand miles considering how clear the oil started out being.
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Old 05-23-2009, 03:11 PM   #19
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I've had my oil changed at the dealer since I've bought it, but I'm going to start doing my own now. I just ordered some Amsoil 0W-20 and a FRPP high-performance oil filter. My car is only a weekend/sunny day driver, so I plan on changing it once a year (around this time).
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Old 05-24-2009, 10:27 AM   #20
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Quote:
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I just ordered some Amsoil 0W-20 and a FRPP high-performance oil filter. My car is only a weekend/sunny day driver, so I plan on changing it once a year (around this time).
I bought the Amsoil EaO synthetic oil filter to go along with the 0W-20 oil the filters arent cheap around 16-17 dollars but its the only filter amsoil guarantees up to 25000 mile or yearly oil changes with. Even though I won't drive that many miles before changing mine because I only put about 5-6k miles per year on my stang so I will change mine yearly.

SERVICE LIFE
AMSOIL Synthetic 0W-20 Motor Oil is recommended for extended drain intervals in unmodified(1), mechanically sound(2) gasoline-fueled vehicles as follows:

• Normal Service(3) – Up to 25,000 miles or one year, whichever comes first.

• Severe Service(4) – Up to 15,000 miles or one year, whichever comes first.

• Replace AMSOIL Ea Oil Filter at the time of oil change, up to 25,000 miles or one year service life, whichever comes first (other brands at standard OEM* intervals).
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Old 05-24-2009, 10:27 AM
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