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Old 11-24-2013, 05:50 PM   #1
03FocusZX3
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Oil leaks after using synthetic oil....

So I did a oil change not to long ago with Castro gtx fully synthetic oil. I originally would always use conventional castrol gtx and had 0 leaks. Now it has a bad oil leak, it worries me and I wonder if I should just go back to non synthetic. What could the problem be? Any input would by great. Thnks guys!

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Old 11-24-2013, 05:54 PM   #2
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Another thing, I'm not even sure where it is leaking at, I park on a steep grade and it leaks, but when I drive it to work and let it sit for 9 hours while I work, I don't see any leaks at all. I'm at a loss... I'm thinking about trading in the car....

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Old 11-24-2013, 08:04 PM   #3
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synthetic oil can shrink rubber oil seals, like the rear main

high mileage oils have additives that swell rubber seals

there is a happy medium, most regular conventional oils
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Old 11-24-2013, 08:18 PM   #4
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Just go back to whatever oil you were using before, not a big deal
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Old 11-24-2013, 11:45 PM   #5
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I personally find it funny that one would get rid of the car over it, life is going to be so kind to one who thinks like that. No way is that cost effective. Be even funnier if only a $10 pressure switch.

Syn oil makes older seals leak, many have reported it.
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Old 11-25-2013, 12:06 AM   #6
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I have a low tire.
Must sell car. It's junk.


First things first,
Get under the damn thing an make sure it's not old oil dripping.
Then check to make sure the filter and drain plug are tight.
And long as you're under there, look for any other place it could be leaking.
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Old 11-25-2013, 12:11 AM   #7
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Or, my outside temperature gauge is off by two degrees from the real temp on my brand new car, I'm getting rid of this piece of junk!!

Laughable.
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Old 11-25-2013, 04:27 AM   #8
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Quote:
Originally Posted by amc49 View Post
Or, my outside temperature gauge is off by two degrees from the real temp on my brand new car, I'm getting rid of this piece of junk!!

Laughable.
LOL LOL This is what makes dealers very rich Lol lol
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Old 11-25-2013, 08:15 AM   #9
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Sigh, I would never get rid of my focus. I was frustrated, no need to criticize me. Anyway, I was told that running synthetic oil then going back to conventional will cause even worse oil leaks? So should I just switch back to conventional oil and maybe use Mobil 1 and put some Lucus oil stabilizer in there?

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Old 11-25-2013, 08:18 AM   #10
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BTW iminhell I have got under the car recently and degreased all the oil, made sure the drain plug and oil filter was tight.

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