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Old 02-23-2005, 04:57 PM   #1
SunnyRVF
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2002 WRX
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Default Switching from dino to full synthetic enigne oil at high mileage

Ok, I just recently bought a 2002 WRX with 61K miles on it. At the next coming up oil change, I would like to switch to full synthetic oil. I know that there is a risk of leaking after switching due to gasket shrinkage and too good of a cleaning job by the sythetic oil (where the dino oil resdue/deposit had actually plug the leaks). Has anyone done this without a problem? Just want to know if I should even bother with the switching (I change my engine oil/filter every 3K miles). Thanks.
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Old 02-23-2005, 05:07 PM   #2
bal00
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The type of base oil(dino/synth) has virtually nothing to do with how good of a cleaning job the oil does. The deposits are oil-insoluable, no matter if synth or dino. The cleaning is done by the detergent/dispersant additives, which are present in mineral oils, too. Nowadays only some special classic car oils come without them. Switching to synth will not be a problem, especially with an engine that young, but you should look into longer OCI's when running synthetic.
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Old 02-24-2005, 12:38 PM   #3
Stanley
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61K isn't that high of mileage. If you are comfortable that the previous owner did regular oil changes, and hopefully you are, it should pose no problem whatsoever to switch.
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Old 02-24-2005, 04:44 PM   #4
SunnyRVF
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Thanks! Full synthetic it is!
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Old 02-26-2005, 02:29 AM   #5
Kyguy
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Quote:
Originally Posted by bal00
The type of base oil(dino/synth) has virtually nothing to do with how good of a cleaning job the oil does. The deposits are oil-insoluable, no matter if synth or dino. The cleaning is done by the detergent/dispersant additives, which are present in mineral oils, too. Nowadays only some special classic car oils come without them. Switching to synth will not be a problem, especially with an engine that young, but you should look into longer OCI's when running synthetic.
What's an OCI?
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Old 02-26-2005, 11:21 AM   #6
DrD
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Quote:
Originally Posted by Kyguy
What's an OCI?
I am guessing he means increasing the drain interval (Mobil 1 claims you can go 15k miles) - OCI is probably oil change interval.
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Old 02-26-2005, 12:50 PM   #7
poison
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Yes, OCI = oil change interval

SunnyRVF, even if your car started to leak from shrunken seals being uncovered by the synth, you should still keep going with it for at least 2-3 OCI's. Synthetic generally has very good additives to condition the seals and counter shrinkage. So in the first couple thousand while things are being cleaned up, you may start a leak, but instead of panicking and going back to dino, keep with it and give the synth time to condition and 'plump' up the seals.
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