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How to tell if the car used synthetic oil or conventional oil?

 
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Old 04-24-2008, 04:03 PM
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How to tell if the car used synthetic oil or conventional oil?

Hi,

sorry for so many Qs in a day.

The previous owner said he used "expensive oil (costs abt $70 for each oil change)" when he did oil change in past 2 years and he has no idea about if he used synthetic oil or conventional oil.

So my question is , how can I tell if what oil he is using? Visit the mechanical shop he did oil change and find record, or there is somehting else I can do?

I know I can not switch back to conventional if he uses "pure" synthetic oil, but this is getting too complicated for me.. I don;t want to spend $70 for each oil change.

Thanks!
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Old 04-24-2008, 04:16 PM
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Welll... lucky for you.. there is barely NO pure full synthetic over the selves. Oil like moble 1 and castrol synthetic ( even though it says fully synthetic its not PURE ) is actually made from a Minerial Oil so it can and will mix with conventional oil. So if he was walking in the stored getting it. Or going to a shop changing it.. its most likely Not PURE.

Synthetic blend and fully synthetic is not PURE synthetic.

So i would just pick the oil of my choice and stick with it.
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Old 04-24-2008, 04:21 PM
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Thank you for the answers!! Now I don't have to worry abt screw up the engine by using wrong engine oil



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Originally Posted by Rory View Post
Welll... lucky for you.. there is barely NO pure full synthetic over the selves. Oil like moble 1 and castrol synthetic ( even though it says fully synthetic its not PURE ) is actually made from a Minerial Oil so it can and will mix with conventional oil. So if he was walking in the stored getting it. Or going to a shop changing it.. its most likely Not PURE.

Synthetic blend and fully synthetic is not PURE synthetic.

So i would just pick the oil of my choice and stick with it.
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Old 04-24-2008, 04:23 PM
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Quote:
Originally Posted by mlgbwk View Post
Thank you for the answers!! Now I don't have to worry abt screw up the engine by using wrong engine oil
O yea, .. one more thing ... run a engine flush before using the new oil u choose. This will make sure u get all the old oil out first.
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Old 04-24-2008, 04:26 PM
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Sure! Thanks!~

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O yea, .. one more thing ... run a engine flush before using the new oil u choose. This will make sure u get all the old oil out first.
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Old 04-24-2008, 06:11 PM
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if you think the previous owner did run full synthetic and you wanna go back to conventional, you can actually transition it by doing about 2 oil changes of synthetic blend before going completely conventional.


now i'm off to find that oil thread BadMofo posted....


Oil Information and Myths busted.
yayyyy
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Old 04-24-2008, 07:57 PM
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Dont let the placebo effect rule your decision.

You can switch from Synthetic back to dino oil anytime.
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Old 04-24-2008, 10:11 PM
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Yea, switching from synthetic to conventional is no big deal, when i did it i flushed the system just to be safe, better safe then sorry right?!, and then have been changing the oil every 3-4k with conventional. $10 an oil change is a helluva lot better then $70-$90 for synthetic. You save ALOT of money, i did all the calculations back when i was deciding what to do and i save close to $250 on oil changes (assuming u change the oil at 3,500 on conventional and 7,500 on synthetic) and swtiching from conventional to synthetic is even less of a hassle then the other way around
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Old 04-25-2008, 08:23 PM
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well if the guy went to a shop, ask him which shop he went to and then get the details from the shop. around here (socal) a dealership will charge about 60-75 for "syn" and the independant shops ie. 15 min. lube will charge about 45-55 for "syn". Of course there are coupons in the papers all the time too.....
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Old 04-29-2008, 07:40 PM
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To answer the original question: Sometimes a good way to determine if the motor has been on dino or synthetic is to pull the valve cover and check for sludge deposits. Synthetic doesnt really form sludge unlike dino oil.
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