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Unread 12-03-2014, 10:30 AM   #1
VT-05WK
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Only drained 3 quarts of oil...

Did an oil change about 600 miles ago. When I did it, I barely drained 3 quarts of oil when it holds 6 quarts. I don't see any visible signs of leaks like on the ground. Looking for advice on where to look. What happened to the other half of the oil? I use castrol gtx high mileage which is part synthetic.

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Unread 12-03-2014, 10:39 AM   #2
colinzj
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You'll "lose" some in the filter, but not 3 quarts' worth.

Did you check the dipstick before you drained it? Did it read full then?
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Unread 12-03-2014, 11:16 AM   #3
nvrdone1
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how many miles on the car ? who did the last oil change ? when did you last check the oil level ? could be that at the last change it was not completely filled. Check the tail pipe. If there is black soot on the inside of the pipe you could be burning oil.
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Unread 12-03-2014, 01:01 PM   #4
caulk04
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The tail pipe is going to be black anyway unless you've got a brand new diesel vehicle with $10K worth of emission control garbage in the exhaust.

I'd venture to say you burnt it through the intake due to the PCV system. Next time pop the hood and check the oil once in a while, ehh?
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Unread 12-03-2014, 01:11 PM   #5
wranglin95
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You can also have somebody fire up your rig and see what comes out of the tail pipe. If you see some white/blue smoke you're definitely burning some. How many miles do you have on the vehicle?
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Unread 12-03-2014, 01:46 PM   #6
nvrdone1
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Tail pipe would be black if this was a diesel. Profile shows a 4.7 so unless its really burning oil, the tail pipe should be fairly clean
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Unread 12-03-2014, 03:12 PM   #7
caulk04
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I've never seen a gas vehicle with a clean tail pipe unless it's got about 12 miles on it. That is not a valid way to check for burning oil.

Besides, unless it's a large amount of oil, it'll get trapped and burnt in the cat so you'll likely not see any smoke.
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Unread 12-03-2014, 03:15 PM   #8
VT-05WK
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It is a 4.7 with 85k on the odometer. I'll check the tailpipe next time I go outside. I'll also investigate the PCV idea. I don't know if this helps but I pulled a code for cylinder 3 misfire this morning as well. Could all this be signs of a big issue?
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Unread 12-03-2014, 03:16 PM   #9
nvrdone1
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Interesting thought. I just checked my 2007 5.7 with 108k and the tail pipe is clean. It could be that the cats are burning off any oil going out the exhaust
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Unread 12-03-2014, 03:19 PM   #10
nvrdone1
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code P0303 ? random misfire on any cylinder could be a bad plug or even a failing coil. I'd pull all the plugs and have a look. If any one is oil fouled that could indicate a problem. at 85 k you could be close to spark plug replacement.
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Unread 12-03-2014, 03:24 PM   #11
VT-05WK
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I'm planning on pulling all the plugs Friday. Since I'm in school, I have to work around tests this week. If they are oil fouled, what possible problems am I looking at and how easy are they fixed?

I appreciate all the help/info I'm getting
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Unread 12-03-2014, 05:02 PM   #12
nvrdone1
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If the plugs are fouled it could be rings or valve seals. Only real way to check is to have a shop do a leak down & compression test. If it was mine and I'd never changed plugs, Id start there and see what happens.
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Unread 12-03-2014, 07:23 PM   #13
fishinbama
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I have seen some engines burn oil only under certain conditions. For example, long distance and under load, such as when towing for a distance. Maybe you burned it? One possible thing to look into is your pcv system. If it's no working properly, you can burn oil quickly.
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Unread 12-03-2014, 07:39 PM   #14
Aclow33
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Any good shop changing oil would check your dipstick before draining it. You might want to find a new place to go.
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