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Old 05-06-2003, 09:29 PM   #1
dingo dave
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Default dino to synth to dino

Is it ok to switch from dino to synth back to dino within the span of 2500 miles? The car had used dino up to 48K. That's when i switched to synth. My synth is dissapearing rapidly, more so than with dino.

thanks
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Last edited by dingo dave; 05-06-2003 at 09:41 PM.
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Old 05-07-2003, 08:24 AM   #2
Legacy777
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You really should not do this.

This can cause major havoc with the oil seals. dino & synth oils have a completely different additive base and conditioners for seals, etc. Switching to synth on a higher mileage engine can sometimes cause oil leaks due to worn seals that were plugged up with dino sludge.

Switching back to dino.....I have heard of seals completely crapin out......whether that is true today with modern oils when swapping from dino to synth & back to dino......I'm not sure.

I'm sure others will have some other input as well.

For most cases, it is not good to swap back and forth between synth & dino......same goes for brands....as the oil additives will vary from manufacturer to manufacturer.
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Old 05-07-2003, 10:11 AM   #3
mrbell
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Default

I can't speak from experience, as I've never done the switch, however most(if not all) synthetic oils carry a label that says "certified compatible with conventional oils" or something like that... I don't know what the certification criteria is....
Also, I have to say, that I can't see why switching back and forth would really cause the issues above. I don't know what additives could cause those types of issues, except that a worn seal is a worn seal. It may not leak(as much) with conventional oil because it is less refined and won't fit thru the smaller cracks, where the synthetic might. Also oils have detergents which might clear up some gunk that is sealing potential leaks. But I don't think this has much to do w/ synth vs. conventional. More to do w/ you already have a problem, do you want to be aware of the symptoms or not?
Again, I have never switched back and forth, only from conventional to synth, this is just my logic. But, if I had to, i wouldn't have any reservations about doing so. I just can't see any circumstances where this would be "bad", it just might make already existing problems more apparent.
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Old 05-08-2003, 12:51 PM   #4
ImprezaVA
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Default switching oils

48,000 miles and synthetic is disappearing. Yes, syth. is a little slippier, well, a lot slippier, but your motor is too young to have oil seals leaking already. Did you buy the car new? Sounds like to me someone was neglecting the 3,000 mile daily maintenance procedure. Yes, oils will blend. In fact, instead of buying Mobil 1 10w30 synthetic blend, I just buy 4 quarts conventional and one quart fully synthetic 10w30 every 3k. Obviously, your car has a problem with synthetic. I'm stumped, but common sense tells you to switch back and keep using dino. Maybe the dino had built up false seals and the sythetic cleaned all those away. That's my 0.02 worth.

-Charles-
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Old 05-08-2003, 01:12 PM   #5
dingo dave
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Quote:
Sounds like to me someone was neglecting the 3,000 mile daily maintenance procedure
I bought it at 48K from a guy who had done regular maintenance.
I've heard that subs can use as much as 1 quart of oil per 1k miles. maybe this is normal, but i don't remeber it using this much during the short amout of time i ran it with dino.

Last edited by dingo dave; 05-08-2003 at 05:50 PM.
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Old 05-08-2003, 05:32 PM   #6
ImprezaVA
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Default Using Oil

I don't think it's normal for Subaru's to use a quart of oil every 1,000 miles. Can you imagine how much that would cost you over the lifespan of a car. My '98 has 83K on it and doesn't use any oil between changes. Look at the bright side, at least you always have fresh oil . I'm bored so I'll throw some numbers at you for a car that would have 150,000 miles on it using the cheapest oil and filter: Mobil 1 dino for $1.17 a quart and a $3 fram oil filter.

150,000/3,000 miles = 50 oil changes
(50 x $1.17) + (50 x $3.00) = $208.50 spent on regular interval oil changes.

150,000 miles/1000 = 150 times you will have to add a quart of oil
150 additions of a quart x $1.17 = $175.50

Total amount: $384.00 compared to the $208.50
The difference: $175.50, enough to buy a rear swaybar

-Charles-
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Old 05-08-2003, 05:51 PM   #7
dingo dave
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Quote:
I don't think it's normal for Subaru's to use a quart of oil every 1,000 miles.
That's just what I heard Subaru allows for, to cover their ass, i guess.
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Old 05-08-2003, 11:11 PM   #8
Legacy777
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I've got 170,000+ miles on my legacy and don't burn a drop of oil.
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Old 05-09-2003, 07:58 AM   #9
owen
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Default Mine uses mobil 1

I ran Mobil 1 for the first 50K on my Legacy and it consumed over a quart every 7500 miles. I recently swithed to dino and the consumption is less than half of what the synth was. No clue why, but I thought I'd offer the info.
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Old 05-09-2003, 06:15 PM   #10
Legacy777
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I actually run just the 10w30 regular Mobil oil. I burned a little oil with some others, penzoil, castrol, etc. Burn none with mobil
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