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This is a discussion on oil? within the New Member Hangout forums, part of the Community - Meet other Enthusiasts category; hello, i bought my car with 40,000miles on it and the oil was never synthetic and i started to use ...

  1. #1
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    Jun 2006


    i bought my car with 40,000miles on it and the oil was never synthetic and i started to use it at 43,000 does any one think this is bad for the motor?

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  3. #2
    Administrator ...De Rerum Natura TheJ's Avatar
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    Bro do you even live in the Dirty South
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  4. #3
    Join Date
    Jul 2003
    I Support ClubWRX
    I've spent most of my afternoon reading up on Oil on this forum, nasioc, and even PMing the guru himself SD_GR.

    From what I gathered the general consensus is not to go Syn. to soon, because you'll cause sealing issues with the rings, and not to wait to long, because the Syn. tends to get thinner quicker then dino and may cause some leaks.

    The problem is there is no set time for either. Some people go Syn. at the first oil change and have no issues, others like to wait till 10k and have no issues. Some people switch at 40 with no issues, and others have switched at 100k with no issues.

    The main thing is to monitor your usage after doing any kind of brand change or type of oil. Also make sure to change it on a regular basis. The only real way to see if it's hurting your motor would to be to have Blacklab test an oil sample before they Syn. switch and then to test afterwards.

    If non of that makes sense to you, then the answer is probaly not.
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  5. #4
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    Jun 2006
    Raleigh, NC
    I've gone to synthetic at 61k on my 03 wrx wagon (and with a bosch premium filter). My car likes it. Just watch your consumption to make sure that you dont lose it anywhere but unless you've got hella deposits on your seals that are keeping things from leaking then you're not going to see any leakage from even m1 synthetic. I debated it for a while before switching but for the heat that is generated, you probably want to use a synthetic oil. Being that its thinner is not necessarily a bad thing. A slight decrease in oil pressure will result and that means less work for the oil pumping system to do. It seriously helps on cold startups.

    I've noticed that dino oil will thin out (from observation but not by rigorous testing) just as much as synthetic over the course of 3000 miles. As both of them collect particles, they lose their lubrication properties and use up the additives.

    My car had the subaru maintenance plan before I bought it. I was able to view records of all the oil changes that it had, and it was like clockwork. You can probably stretch a good synthetic like M1 to 4000 miles, but I would seriously consider changing between 3 and 4. A lot of people that get the blackstone labs find that they can go very long distances between changes, but I think that a shorter interval will keep you in touch with something that may go wrong with the car, and they never do seem to mention the filters in their writeups. You may get 12k out of a change, but within that 12k, the seasons and environment is destined to change so would you say that oil is going to have the same lubrication propteries on a 90f month of summer as it does on a 40f month in the fall?

    The only reason to use dino oil is because its less likely to seep out of a seal or connection. Cars are built to such tight tolorances now that I couldnt see this being a problem unless it was a problem from the start that was masked by the dino oil. You'll see that there was a report by somebody who worked at a dealership that claimed that synthetic caused bearing failure, but honestly, there isnt enough evidence or details about the cars and the conditions that lead to the failure. Perhaps that one dealership got a bad batch of motors and doesnt realize it. We'll never know.


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