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post #1 of 40 Old 01-20-2008, 05:10 AM Thread Starter
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Synthetic oil change intervals

I have a question about when you should change synthetic oil. But before I ask let me give you some background information. I recently bought a 2003 Accord four cylinder sedan. The previous owner was using synthetic oil so I figure I will do the same. I've always used conventional in my cars; basically just because its cheaper, I've never had any problems, I do not drive spiritedly or aggressively.

Okay, so to the question. How often do you change synthetic oil? From my research I've seen all types of claims, but the most common claim seems to be around 5,000-6,000 miles. So I am thinking every 6,000 or six months. Does this sound reasonable?

By the way, I had the dealer put synthetic in it for the first oil change I got and the sticker they put on says to change it again in 3,000 miles I'm not sure if this is simply a tactic to see if I will spend money changing the oil ever 3k, if it really is advised to do so, mistake, or if someone just didn't know any better.


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post #2 of 40 Old 01-20-2008, 05:58 AM
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The sticker is just to get you back in the dealership, it's a tactic. The only way to positively know is to have the used oil analyzed several times to establish a trend. I change 7500 miles or one year whichever comes first, many go much farther.

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post #3 of 40 Old 01-20-2008, 07:37 AM
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With synthetics, I've found that it is best to go the max a manufacturer recommends, so RtexasF's 7500 figure is a good one. Synthetics can go even further than that but it gets risky, as most oil filters need to be replaced by that point. If you change your oil yourself, though, you can put on a heavy duty filter...I've heard about people going 10,000+ miles, analyzing their oil and it was fine.

And speaking of, I've heard that some of the newer, more high-end cars are saying 10,000 oil change intervals in their manuals. I haven't been able to confirm that as of yet but I could believe it.

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post #4 of 40 Old 01-20-2008, 09:43 AM
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Quote:
Originally Posted by RTexasF View Post
The sticker is just to get you back in the dealership, it's a tactic. The only way to positively know is to have the used oil analyzed several times to establish a trend. I change 7500 miles or one year whichever comes first, many go much farther.
The 3k oil change is a revenue generator for whomever put the sticker in your window. Porsche recommends getting the Mobile 1 replaced every 15k miles in their cars. But 7500 on regular oil should be just fine as the maintainance minder in the newer Honda's suggest.

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post #5 of 40 Old 01-20-2008, 09:49 AM
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The Owner's Manual for my 2006 Corvette states and recommends an oil change every 15,000 miles. The vette comes factory filled with Mobil 1. While I don't subscribe to such long intervals it does say something about a manufactures trust in Mobil 1.

I'll be switching my 08 I4 to Mobil 1 soon and I'll most likely change it around 7500 miles or so. But for me that about 11 months of driving.

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post #6 of 40 Old 01-20-2008, 02:12 PM
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Most newer cars that use a true oil life system, GM's comes to mind, that base the life and change interval on many factors.
It's an active system that looks at avg speed, avg rpm, peak and low rpm times, engine temp, time to engine temp, some monitor oil temp, etc.

A GM oil life system can indicate an OCI as low as 2500 miles and as high as 15 to 20,000 miles. This all assumes that the operator/service facility uses the CORRECT oil for the car. One that meets the GM spec called for in the owner's manual. All bets are off if the incorrect oil is used.

I'm not sure if Honda's system is active or not. I'd like to believe it is, then that way the car will decide when the changes are due based on the way the car is operated. Using synthetic oil isn't necessary, at least as long as the 5w20 oil that's used meets the requirements set out by Honda.

There's where it gets tricky, as Honda doesn't publish an actual "spec" like GM, Ford, Chrysler and all Euros do. The only exception is the RDX's spec of HTO-06 for the turbo 2.3.

You can't believe what's printed on oil bottles as most don't meet the specs they say they "exceed".
Only Mobil 1's labeling is accurate that I know of.

Remember API specs are made by the oil companies FOR the oil companies. Car manufacturers have no say in that. Even the ILSAC GF ratings are more an oil company reaction to a wish by the car companies need for lower friction, catalyst friendly oil.

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post #7 of 40 Old 01-20-2008, 03:03 PM
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"Porsche recommends getting the Mobile 1 replaced every 15k miles in their cars."

Most porsche's take twice the amont of oil as the Honda,so 15K
is normal for them.So divide that by 2 and you get 7.5k.
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post #8 of 40 Old 01-20-2008, 05:24 PM
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For all concerned it's MOBIL 1, not Mobile, sorry couldn't help it.
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post #9 of 40 Old 01-20-2008, 06:58 PM
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Actually, it's Mobil 1.



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post #10 of 40 Old 01-20-2008, 09:51 PM
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Thinking of going to 10k changes with the Mobil 1 EP and Mobil 1 filter. Tired of changing oil.

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post #11 of 40 Old 01-20-2008, 10:06 PM
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At the ford dealer I work at, Motorcraft (Ford) recommends 5k oil change intervals with their synthetic blend. But for cars over 100k we switch to 3k intervals.

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post #12 of 40 Old 01-20-2008, 10:41 PM
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I do mine every 5k miles with Castrol Syn. 5w30. Why 5k? It is easy to remember when I look at my odometer.

Cheers !!!
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post #13 of 40 Old 01-20-2008, 11:41 PM
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Quote:
Originally Posted by drcookie View Post
I do mine every 5k miles with Castrol Syn. 5w30. Why 5k? It is easy to remember when I look at my odometer.

Cheers !!!

5k!! I plan to use Castrol Syntec aslo next oil change but I will leave it for 10k.

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post #14 of 40 Old 01-21-2008, 11:28 AM
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On an 05 Accord 4cyl I've been using a mix of Castrol Syntec (2 quarts) and Castrol GTX (almost 3 quarts) of 5-20. Change oil and filter every 5K, runs great at 67K miles. All purchased on sale BTW
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post #15 of 40 Old 01-21-2008, 02:20 PM
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Contriver2,

Can you give us more information such as previous oil brand/viscosity, oil filter, intervals, driving style (city vs highway), etc.? Air filter intervals can also factor in when you start considering fuel dilution & its effects on the oil with leftover aromatics, etc. Also, where are you located or general weather conditions?


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