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Old 01-25-2003, 01:39 AM   #1
DanZ
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Default For those who use synthetic oil...

How often do you change your oil? I have been getting the synthetic oil change done at the dealership, but they still want you to change it every 3000-4000 miles, even though synthetic should last 10000 miles. I am thinking about just changing it myself with mobil 1 every 6 months or so, but it's way too cold right now...I'll wait for spring.
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Old 01-25-2003, 02:39 AM   #2
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Seems like your dealer's ignoring the manufacturer's recommended intervals for obvious reasons. Subaru recommends 7,500 mile oil changes which seem kinda long so I plan on changing my oil at 5,000 mile intervals with Mobil 1.
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Old 01-25-2003, 03:50 AM   #3
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Quote:
Originally posted by esteve
Seems like your dealer's ignoring the manufacturer's recommended intervals for obvious reasons. Subaru recommends 7,500 mile oil changes which seem kinda long so I plan on changing my oil at 5,000 mile intervals with Mobil 1.
try 7500 under NORMAL driving conditions, about .02% of cars see normal driving conditions, the rest see severe, i.e.: reccomended 3750 miles sythentic or not.

jeremy
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Old 01-25-2003, 03:57 AM   #4
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Default hah

Service technician at the dealership i use told me Subarus dont respond well to synthetic oil... develop strange engine noises and other such stuff. What's up with that?
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Old 01-25-2003, 09:27 AM   #5
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I have been using Mobil 1 since 1k miles. Got the oil tested a couple of times on oil lives of 3500miles and 4500miles at about 22k to 27k miles and both test results showed no significant wear, and no fuel and no coolant. A lot of reserve on oil's buffering capacity and the testing company suggested I could go on 6500miles on the next oil change.
I am probably going to follow their recoommendation and get it tested again.
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Old 01-25-2003, 11:53 AM   #6
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Even under severe service, Subaru's recommended oil change interval is 3,750 miles or 3.75 months, whichever comes first. So, using a good synthetic, I'd still think that 4K miles/4 months would be just fine.

While the vehicle is under warranty, I would try to stick very close to Subaru's recommendation; that way, no dealership will be able to claim oil change intervals were at fault for any engine problems.

Once warranty has expired, I'd seriously consider extending oil change intervals, using such quality synthetics as Amsoil, Mobile1, and Redline. One of your best tools for safely conducting extended oil change intervals is oil analysis.

I've mentioned this before on other threads, but the same still applies: Check out the forum threads at www.bobistheoilguy.com, which is a wonderful site. Many people are able to safely extend their oil intervals to 10,000 miles.

Cheers,
Jeff
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Old 01-25-2003, 11:59 AM   #7
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I guess it is overkill, but I religiously change my synthetic every 3,000 miles.......I guess I'm more concerned about the contaminants and soot in the oil, than the oil actually wearing out....

For the record: I've been using Valvoline 5W-30 SynPower ever since the first oil change at 1,000 miles.... It's only about 3.99/Qt., not that there's anything wrong with paying $8.00/Qt. for Redline or Motul.......
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Old 01-25-2003, 12:04 PM   #8
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Default Re: hah

Quote:
Originally posted by Imhotep
Service technician at the dealership i use told me Subarus dont respond well to synthetic oil... develop strange engine noises and other such stuff. What's up with that?
It has been mentioned that a mineral based oil should be used for the first 6,000 miles due to hard cylinder liners and the need to break them in, but I (and many others, I'm sure) have had no problems switching at 1,000 miles or less...

And it says nothing about this subject in the owner's or service manuals...
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Old 01-25-2003, 12:08 PM   #9
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My car has 40,000 miles. Why shouldnt I switch to synthetic? What about blended oil?
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Old 01-25-2003, 01:03 PM   #10
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Imhotep,

There's no reason why you shouldn't be able to successfully switch to synthetic; assuming, of course, your engine is running just fine.

Not that it's absolutely necessary, but you may wish to consider using a product like Auto-Rx (basically, an engine cleaner) to help clean up some build-up prior to going a full interval on synthetic. What you'd do is use about 2oz. of Auto-Rx to 1 qt. of oil and run it for about 500 miles, then drain. At that point, you could go full synthetic.

I just bought a '95 Jeep Wrangler with 128,000 miles. Because of the high miles, I'm going to run two cleaning cycles with Auto-Rx before switching to either Redline or Amsoil.

Good luck!
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Old 01-25-2003, 01:06 PM   #11
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Forgot to mention this . . .


While performing the cleaning cycles, I'm going to use Mobil1 10W-30 synthetic, since it's relatively inexpensive. Afterwards, I'm going to switch to Amsoil or Redline for extended oil drains.
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Old 01-25-2003, 01:42 PM   #12
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i'm going to warn you now, DO NOT USE ENGINE ADDITIVES if you care to argue this with me i am sure Subaru has the same Info Honda does when it comes to these corossives. They are not needed.

Jeremy
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Old 01-25-2003, 01:42 PM   #13
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mobil1 syn. changed at every 5k mi...........

as for the unrealistic definition of "normal" driving condition in the owners manual....well, in all my yrs of owning a car, and talking to other people, i have yet to meet someone who have met that definition
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Old 01-25-2003, 01:47 PM   #14
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Quote:
Originally posted by newbie sewbie
mobil1 syn. changed at every 5k mi...........

as for the unrealistic definition of "normal" driving condition in the owners manual....well, in all my yrs of owning a car, and talking to other people, i have yet to meet someone who have met that definition
exactly, it's very rare to find someone who falls into the "normal" driving conditions position. i know of about 3 people at my dealership that meet those requirements, 2000 Odyssey with 126k, 2000 Accord with 102K....2002 Odyssey with 47k.....these people drive A LOT for their jobs.

jeremy
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Old 01-25-2003, 04:07 PM   #15
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On my '02 WRX Wagon, I use Amsoil synthetic. I have tried other synthetics, and bar none, Amsoil out performs them all.

Amsoil recommends 3x's the manufactures oil change intervals on NA cars and 2x's the manufactures oil change intervals on turbo cars.

I commute 100 miles everyday to work, so I was changing the oil the time. I was looking for some synthetic that would take the abuse of the Arizona summer heat. During the summer, regular oil broke down extremely fast, so I knew I needed better protection. I tried Mobil 1, Castrol Syntec and even Royal Purple. Finally I tried Amsoil, and honestly, I was totally amazed at the results. At 3000 miles the oil still looked golden and didnít show any signs of breakdown. Same applies for 4000 and 5000 miles.

At 6000 miles I changed it out with more Amsoil, and the oil that came out looked only semi abused. After a quick oil analysis at a friendís speed shop, it showed better then normal wear. They mentioned I could have gone another 1000 miles or so.

But please take it for what its worth, what oil to use and when to change it, are all just matters of opinion.
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Old 01-25-2003, 04:56 PM   #16
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Quote:
Originally posted by HndaTch627
i'm going to warn you now, DO NOT USE ENGINE ADDITIVES if you care to argue this with me i am sure Subaru has the same Info Honda does when it comes to these corossives. They are not needed.

Jeremy
I would agree that there are some aftermarket products that may do more harm than good (e.g., those awful radiator stop leak things, a.k.a., mechanics in a bottle), but I would steer away from claiming that all engine additives are bad. For one thing, there are all sorts of additive packages added to both dino and synthetic motor oils that help keep the engine clean, reduce oxidation, and prolong the longevity of the oil itself.

If anyone is interested, check out this link: http://www.auto-rx.com/pages/field_data_sheets.html

It's an analysis by Terry Dyson, who is one of the most respected oil analysts out there.

Imhotep's car only has 40,000 miles on it; so, it probably wouldn't be a big deal to just switch cold turkey from dino oil to synthetic. But, again, it's also a matter of one's driving condtions. I'd say that if the majority of a vehicle's miles were from short trips where the engine frequently didn't reach normal operating temperature, experienced a lot of stop and go traffic, and didn't run a quality synthetic, that the likelihood for sludge build-up would be great. In that case, it MIGHT just be a good idea to use a good product like Auto-Rx; not some $2 engine flush from Gunk or STP.

After an oil change at 1000 miles, and then again at 3000 miles, I began using Amsoil Series 2K 0W-30 in my WRX. After a couple thousand miles and a few months, the oil still looks very clear. I'm going to have an oil analysis done at my next drainage before then switching finally to Redline 5W-40.

In the case of my wife's '02 Forester, it had been running dino oil until I switched it to the abovementioned Amsoil product around 18,000 miles. While there are more miles on it, the oil has been in the crankcase for less than 2 months, and it looks VERY dark. I'm sure it's a combination of two things: First and foremost, it's probably cleaning out a bunch of junk; secondly, that car sees a lot of short trips, stop and go traffic, etc.

Thus ends my epic novel . . .
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Old 01-26-2003, 03:27 AM   #17
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free_bbsd=tell that to the engineers at honda, our dealer still sells them(for whatever reason) and it's the first thing we get nailed on for inspections by honda, the use on engine, trans, gas, and coolant additives.

Jeremy

P.s.: anyone here ever use Z-max?? if so you did tiwce as much damage in one s-max use then you did in 2 oil changes with hard driving.
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Old 01-26-2003, 06:22 AM   #18
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I have to admit i did use that zmax crap in my 95 odysey. Biggest waste of money ever. It did absolutely nothing. I felt stupid after putting it in. The car now has 186K miles on it with regular dino oil and is going strong. Oil addatives are total crap. all you need are regular oil changes. I have to admit honda makes some great engines. the odysey does not have any problems with the engine and asside from some minor electrical problems it feels like the engine could make 250k easy.

OT question. How come non of the aftermarket headlight bulbs last as long as the oem bulbs? It seems that they always burn out in a couple of months.
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Old 01-26-2003, 11:17 AM   #19
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Mobil 1 every 3-4K. Makes me feel good. I figure, better safe than sorry. I run the car pretty hard and commute 100 miles each day. I often drive gravel roads.
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Old 01-26-2003, 12:35 PM   #20
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Amsoil XL7500 5W-30 every 3750-4000 miles, with the OEM filter, on my 02' WRX. I've had very good luck in the past with other vehicles using conventional oil and changing it every 3000 miles, but I thought I'd go with synthetic on the WRX. 2.0 liters making 227 hp, turbocharger - seemed like a good candidate. Plus the fact that I can feel better about being a little rev-happy once in awhile
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Old 01-26-2003, 02:35 PM   #21
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Quote:
Originally posted by pyropretz
OT question. How come non of the aftermarket headlight bulbs last as long as the oem bulbs? It seems that they always burn out in a couple of months.
because they burn up 3 times as hot with no heat sink to pull the heat away from the bulb/connector, that's why most connectors melt with high wattage bulbs.

Jeremy
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Old 01-26-2003, 09:13 PM   #22
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But these aren't higher wattage bulbs. They are regular replacement bulbs from GE, Phillips.. Ect. Sorry again for highjacking the thread
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Old 01-27-2003, 04:58 PM   #23
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Mobil 1 10w30 on 150k ej22 and I change every 4200-4800 miles.
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Old 01-28-2003, 01:54 PM   #24
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i use amsoil 5-30 and i have changed it at 5000 to 6000 miles and my oil has still looked pretty darn clean. i worked at jiffy lube and someone went 20000 miles on regular oil, came in and had 1/4 of a quart of oil left in the motor and the car still ran fine. so sometimes i wonder if the milage thing is the oil/auto manufacturers conspiricy to make more MONEY!

Theres my 2 cents

Mike
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Old 01-28-2003, 09:27 PM   #25
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Mobil1 10w30, 4k-5k mi
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