• Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • Fox 5.0 Mustang Tech

new motor just rolled 1100, still burning oil

  • Thread starter Thread starter cenok is family
  • Start date Start date Sep 18, 2007

cenok is family

15 Year Member
Jun 25, 2003
1,409
69
79
Norman, Ok
Sep 18, 2007
#1
  • Sep 18, 2007
  • #1
so after i installed my aluminum driveshaft today, i drove down the street to put gas in it. when i started it back up, the oil light came on so i turned it back off and checked the oil. there was barely any on the dip stick! so i bought 2 quarts and put them in. my car doesn't leak a drop of anything except maybe a drop or two of tranny fluid out the tail shaft. and my rear main is good. i know new motors burn oil and smoke for a bit but how long are they supposed to? i changed the oil at like 200 miles then again at like 575. also i'm pretty positive i'm getting oil in my intake. i have no baffle on the valve cover, had to remove for my rocker arms. whats a fix for this? should i just get another valve cover and keep the baffle on it? sorry for the long post. thanks
 

91 HATCH

Banned
May 17, 2007
262
0
0
illinois
Sep 18, 2007
#2
  • Sep 18, 2007
  • #2
if you are using synthetic oil it will take forever to break it in
 

cenok is family

15 Year Member
Jun 25, 2003
1,409
69
79
Norman, Ok
Sep 18, 2007
#3
  • Sep 18, 2007
  • #3
i'm not yet. i'm using castrol 10w40 conventional oil. i plan on switching to synthetic at around 3000 miles though. do you think that'd be enough miles to start using synthetic?
 

96SVTpilot

Member
Mar 10, 2006
82
0
6
Spanaway, WA
Sep 18, 2007
#4
  • Sep 18, 2007
  • #4
Any oil getting past the rings? How do the plugs look?
 

88mouse

New Member
Apr 18, 2007
630
0
0
Mooresville nc
Sep 18, 2007
#5
  • Sep 18, 2007
  • #5
cenok is family said:
i'm not yet. i'm using castrol 10w40 conventional oil. i plan on switching to synthetic at around 3000 miles though. do you think that'd be enough miles to start using synthetic?
Click to expand...

3000 miles will be fine. Depending on whay hone was used on the block may take a little more time to seat the rings in.
 

vristang

15 Year Member
Mar 31, 2005
4,933
101
124
Seattle
Sep 18, 2007
#6
  • Sep 18, 2007
  • #6
Find out where the oil is going...

Is it getting into the intake?
Is the pcv hose wet with oil?
Is the TB/VC hose wet with oil?

Is there oil in the intake manifold?


Most sources will say...
"Rings will seat or not seat in the first couple hundred miles, or sooner..."

Consider a compression and/or leakdown test to evaluate ring seal...

What kind of vacuumm is the intake seeing?
How about the crankcase?

jason
 

ninety15.0

New Member
Mar 10, 2004
1,336
0
0
Sep 19, 2007
#7
  • Sep 19, 2007
  • #7
Whats the deal with the heads...more specifically the valve guides and stem seals? Are they new? Im guessing by the lack of head info in your sig that you are running stock E7's. Have they been rebuilt?

You should have a buddy drive behind you while you bring the revs up and then let off and let the motor decel from high rpm. If you have a guide or stem seal problem you would most likely see smoking. Then have a person follow you while you do a WOT run. Smoking at WOT may point you to rings. Also have someone start the car for you when its cold...stand behind the car and look for smoking on cold start up. Good luck man
 

SVT32VDOHC

waiting for the next hack atta
Founding Member
Nov 22, 2001
3,501
28
119
Motor City
Sep 19, 2007
#8
  • Sep 19, 2007
  • #8
Could the oil be getting into the intake and burning that way? That is too bad man, I hope you figure it out soon!
 

cenok is family

15 Year Member
Jun 25, 2003
1,409
69
79
Norman, Ok
Sep 19, 2007
#9
  • Sep 19, 2007
  • #9
thanks for all the responses guys. i haven't checked my plugs yet, i'll do that later today when i get off work. i was messing with my vac hoses the other day and i noticed my pcv hose had some oil on it as well as my vc/tb hose. how much do compression and leak down tests usually run? when i first got the car running i had a vac check done to it and he said it was exactly where it needed to be....like 17 or whatever. don't know about the crankcase though. he just hooked a vacuum gauge up to the vacuum tree. the heads are stock e7's off a motor that had about 10k on it. i gave them a quick look over and everything looked good, but now i'm starting to wonder. the valves were even still silver and not covered in carbon, that's how "good" they looked. it does smoke a bit on cold start ups, i've noticed, and i think a bit when i get on it. so you guys think maybe rings? i used Power Seal moly rings, if that matters. again, thanks a ton for the responses.
 

Mustang78

New Member
Feb 8, 2006
486
0
0
Aberdeen, WA
Sep 19, 2007
#10
  • Sep 19, 2007
  • #10
i vote for the PCV, you need some baffled valve covers...the PCV i under ported vacuum so it will pull that oil through the hose and right into your combustion chambers..try using a breather unstead of a PCV for a short while and see if it clears up, i dont know the downside to not running a PCV on an EFI engine so maybe someone else can help there

~Mark~
 

ninety15.0

New Member
Mar 10, 2004
1,336
0
0
Sep 19, 2007
#11
  • Sep 19, 2007
  • #11
Smoke on start up would make me lean towards valve stem seals or guides. On E7's with only 10k miles on them, this would be hard to believe...but you cant rule anything out. Do a comp check or leakdown and report back.
 

cenok is family

15 Year Member
Jun 25, 2003
1,409
69
79
Norman, Ok
Sep 19, 2007
#12
  • Sep 19, 2007
  • #12
appreciate it guys. should i do a leak down only or a compression only? or should i do both? i've never had either done before so i don't know.
 
You must log in or register to reply here.

Similar threads

Engine Gas in my oil
  • limp
  • Jun 15, 2025
  • Fox 5.0 Mustang Tech
  • 2
Replies
35
Views
1K
Fox 5.0 Mustang Tech May 16, 2026
Mindseye007
Buying with a bad motor?
  • djj62478
  • Mar 8, 2026
  • 1996 - 2004 SN95 Mustang -General/Talk-
Replies
8
Views
302
1996 - 2004 SN95 Mustang -General/Talk- Mar 11, 2026
TTSaleen
O
Sooty/Oily Front Engine & Pulleys
  • ozenator
  • Jun 15, 2026
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
12
Views
294
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Jun 22, 2026
Blackhawkxx
1
Engine Motor swap from a 2003 Explorer
  • 1996mustang new
  • Oct 9, 2025
  • SN95 4.6L Mustang Tech
Replies
7
Views
602
SN95 4.6L Mustang Tech Oct 16, 2025
squeak93
Oil galley in 4.6L head...where does it go?
  • droptop93
  • Oct 28, 2024
  • 1996 - 2004 SN95 Mustang -General/Talk-
Replies
1
Views
258
1996 - 2004 SN95 Mustang -General/Talk- Oct 28, 2024
Noobz347
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • Fox 5.0 Mustang Tech
Menu
Log in

Register

  • Forums
  • What's new
  • Media
  • Resources
  • Contact
  • Sponsor
X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?

X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?