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Old 10-12-2001, 03:54 PM   #1
H8YNERS
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Question Synthetic oil...when is best time?

Trying to get a consensus as to when to add synthetic oil such as Mobil 1 into my WRX. I just got the 2nd oil change done last week. I currently have 7100 miles on the odometer. I thought about having the dealership (I have free oil changes for life of car) put in Mobil 1 if I supplied them w/the oil but haven't yet. Any thoughts as to when to do this...like next oil change?

Thanks,
Stephen
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Old 10-12-2001, 03:55 PM   #2
sidewayz
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I've been using m1 since my first change...
love that stuff
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Old 10-12-2001, 04:04 PM   #3
wrx182
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its been recommened to wait until 10,000 miles before you switch over to synthetic....there have been some leaky gaskets reported from switching before....
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Old 10-12-2001, 07:01 PM   #4
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Thanks wrx182,

I remembered reading something like that so I think that's why I didn't switch to synthetic on my 2nd oil change. I think the earliest I'll do it is the next oil change.

Stephen
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Old 10-12-2001, 07:11 PM   #5
ImprezaWRXDriver
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I changed at my first oil change and so far everything is fine. Nothing is wrong and I will continue to do that. I recommend Mobil 1 10W30. Good Stuff. I use mobil 1 in both my Legacy GT and WRX.
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Old 10-12-2001, 09:28 PM   #6
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scooby specialist in california suggested waiting between 15 and 20 k . by then alll the wear on the engine should be set so that would be a good time. im at 4500 miles and i cant wait thaat long . im torn as well. i d probably do it around 10 k which is waht you are thinking
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Old 10-12-2001, 10:05 PM   #7
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will probably switch next change- I'm at a little over 12000 now
definately mobil1

speed safely

Brian
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Old 10-13-2001, 09:55 AM   #8
Jasno999
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You are all crazy.

I changed at 1000 miles. The car should be fine. If you change to synthetic and gaskets start leaking I would be very scared. Oil should not cause that to heppen. If it does happen then something is wrong with the car and the dealer should fix the problem. Synthetic oil is better than regular oil and why not put it in at the begining. You are dumb if you don't. If you wait 10000 miles then you have 10000 miles of wear with a sub par oil. I would rather have 10000 miles with a real quality oil in my car.
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Old 10-13-2001, 04:43 PM   #9
kdmd2b
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Default Re: Synthetic oil...when is best time?

Quote:
Originally posted by H8YNERS
Trying to get a consensus as to when to add synthetic oil such as Mobil 1 into my WRX.

Well you're never going to get a consensus on this issue because everyone has a different opinion. There is a poll on this subject here: http://www.i-club.com/forums/showthr...threadid=76169

IMHO the issue is blown out of proportion. The important thing is that you change your oil often enough but then how often to change is another debate.
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Old 10-14-2001, 03:16 PM   #10
boysetsfire
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i heard that if you are running a turbo it is best to use sythetic..is this true or stick to the 10,000 miles thing?
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Old 10-14-2001, 10:27 PM   #11
smacksube
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how come something as trivial as a stupid oil change gets 10 million response and a multitude of cross-threads, but a technical question, such as the one I posted kinda recently and the many others I've posted neeeever get answered, I don't even get the time of day for a, 'I dunno'........oooh welll
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Old 10-14-2001, 11:44 PM   #12
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I changed at 1200 miles and ever since. I now have 18k miles and zero problems.
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Old 10-15-2001, 05:03 PM   #13
JPatrick
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Thumbs up Leak issue

I was told by mechanics and a sythetic manufacturer back in the late 80's, that the only time the synthetics will cause leaks is if you switch to synthetics for a while and then try to go back to regular oils. Mainly because the gaskets have adapted to blocking it and will promptly leak like crazy if you go back.

Not that any regular sythetic user would want to go back, but would be a helpful note to second owner if you ever sell the car, or find yourself without access to synthetic.

my $0.02
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Old 10-15-2001, 07:44 PM   #14
M_Annequin
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Question Why?

If I remember correctly, the WRX owner's manual says that synthetic is NOT recommended. Does anyone know why? If you change to a "non-recommended" oil then shouldn't your warranty be comprimised?
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Old 10-16-2001, 10:30 AM   #15
jk147
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It doesn't really matter if you change your oil often. If you change your oil every 3000 miles or so, you are fine with either dino or synthetic.
synthetic is suppose to last longer, but you should change the oil because of the dirty particles that gets trapped in the oil during use. Not because the oil degraded so much that you need to replace it.
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Old 10-16-2001, 02:04 PM   #16
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Here is what I know from my ASE class on internal combustion engines. "Dino" oil, is made from crude oil, and has to be refined to get out the impurities. It is impossible to get out all impurities though, and those that make it into your engine contribute to oil getting dirty because they burn, discolor, and attract carbon. Also, crude oil was not "created" to be used in engines. Today's refinement processes and additives help a lot, but don't make the oil flawless. It was because of that that some scientist said "I wonder if I could "make" an oil that has only what you need, and nothing you don't need. Tada!! Synthetic! Synthetic, because it is man made, doesn't have impurities that burn or discolor or turn into sludge, and is SPECIFICALLY designed for internal combustion engines. There for, in theory, you can drive a lot longer before changing your oil if you have synthetic. As a test, put a drop of regular dino oil in a frying pan over high heat. See how long it takes before the oil turns black and hardens. Now do the same test with synthetic. You will be impressed.

Now, about when to switch. The only reason I THINK you might not want to switch to synthetic until after break-in is done is because the synthetic lubricates to well and would keep the enigne from ever truly breaking in all the way. (More friction in dino oil means more thorough break-in)

Let me know what you think.

-Andy
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Old 10-17-2001, 11:15 AM   #17
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Read this months R&T someone wrote in this question and it was answered pretty thoroughly. I think that some justify using synthetic right away because cars like Porshe & BMW do it from the factory. I know that Porshe's are thoroughly tested before being sold so that might be the reason for using synthetic. For my car, I waited till 12k oil change.
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Old 10-18-2001, 08:05 AM   #18
Jasno999
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M_Annequin

"If I remember correctly, the WRX owner's manual says that synthetic is NOT recommended. Does anyone know why? If you change to a "non-recommended" oil then shouldn't your warranty be comprimised?"


WHERE IN THE MANUAL DOES IT SAY THAT SYNTHETIC IS NOT RECOMENDED?
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Old 10-18-2001, 11:06 PM   #19
HomerJay
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They can not void your warranty if you run synthetic because they are not paying for your oil changes. Go ahead and run synthetic if you like. I've noticed an improvement over dino-oil.

-JOE
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Old 10-19-2001, 03:25 AM   #20
Revision
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You really should let your rings and such wear in before using synthetic. Here are my observations. YMMV.

Over the first year of ownership, MY99 RS experienced 14-18 miles per gallon for the first 7k-8k miles. Shifting proved very notchy and baulky for the first 7k miles.

Thereafter I had much improved shifting and mileage in the 21-23 mpg range.

Changed to Redline all around at 9k miles.

At about 30k miles noticed another improvement in mileage hitting an all time high of 26-27 mpg in daily driving.

Comments I've recieved from long-time Legacy drivers suggest that the EJ engines don't truely start to wear in until about 30k miles.

Currently at 53k miles. Experiencing no issues with the tranny clutch or engine. Also getting about 24-25 mpg in daily driving. I have to keep track of miles and $$ spent on gas for business purposes so this is fairly accurate.

Again YMMV.
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Old 10-19-2001, 02:21 PM   #21
RallyImprezive
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YMMV= Your milage may vary?

I wish had kept better track of my car like that. What method do you use to record your data? Excel? or just a notebook and pen? Do you also keep a little pad of paper in your car for notes on gas payed? Let me know...I want to try and keep better track.

-Andy
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Old 10-24-2001, 12:50 AM   #22
SammamishMark
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Lightbulb

I got tired of all the opinions on when to change to synthetic so I emailed SOA. Their answer is paraphrased here (until I get permission to actually post their email):



If you are going to switch to synthetic, switch at the first oil change - at the recommended 3000 miles.

That Fuji Heavy Industries has relaxed thier position on synthetic oil but the owner should follow the manual in regards to oil weight, API classification and when to change the oil.

Subaru has not tested all synthetic oils and thier effects on engine seals but the petro industry follows standards that meet Subaru's specifications. Subaru does not guarantee the performance of any brand of motor oil.

Use only use engine oil that meets or exceeds the API classification designated in the Owner's Manual for the vehicle.

Use engine oil that meets the VISCOSITY requirements for the ambient temperatures under which the vehicle will be operated as outlined in the Owner's Manual.


(The following was emphasised in the response)
Follow the maintaince schedule outlined the service and warrenty manual - don't deviate. Some sythetic motor oils recommend extending the change intervals. Subaru does not recommend this - stay with the schedule in the manual.

Mark
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Old 10-24-2001, 06:55 PM   #23
Martin Ritchie
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Yes, I got a similar response from SOA so I switched at my first oil change and have not experienced any leaks. I agree with Jasno999, if changing to synthetic caused leaks I would be very worried. I believe oil leaks is not something common with Japanese cars and I better stop there less I be accused of being unpatriotic.
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Old 10-29-2001, 06:46 PM   #24
M_Annequin
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Default My Bad

Quote:
Originally posted by Jasno999
M_Annequin

"If I remember correctly, the WRX owner's manual says that synthetic is NOT recommended. Does anyone know why? If you change to a "non-recommended" oil then shouldn't your warranty be comprimised?"


WHERE IN THE MANUAL DOES IT SAY THAT SYNTHETIC IS NOT RECOMENDED?

If I remember correctly...
I looked again and I did not remember correctly.

Why, oh why arte thou yelling?
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Old 10-31-2001, 01:31 PM   #25
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That's all good the Subaru says 3000 miles, but what about owners that do the first at 1,000? Dino oil 'til 3 and then synthetic?

Roger
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