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

Would changing oil hurt?

  • Thread starter Thread starter GTOreturns
  • Start date Start date Feb 1, 2007
G

GTOreturns

Well-Known Member
Oct 1, 2003
51
17
59
West Coast Best Coast
Feb 1, 2007
#1
  • Feb 1, 2007
  • #1
I switched to synthetic oil when my motor had 20,000 miles on it. Now Im at about 130-140,000. What would happen if I went back to regular dino oil?
 

HISSIN50

"How long does it take to get help in here?
15 Year Member
Nov 29, 1999
31,179
33
129
Feb 1, 2007
#2
  • Feb 1, 2007
  • #2
You might clean up some seals and reveal some leaks. Otherwise, you very well could be fine.

Good luck.
 
G

GTOreturns

Well-Known Member
Oct 1, 2003
51
17
59
West Coast Best Coast
Feb 1, 2007
#3
  • Feb 1, 2007
  • #3
HISSIN50 said:
You might clean up some seals and reveal some leaks. Otherwise, you very well could be fine.

Good luck.
Click to expand...

I thought it was the other way around. Changing to synthetics reveals leaks? What do you mean "clean up some seals"?
 

HISSIN50

"How long does it take to get help in here?
15 Year Member
Nov 29, 1999
31,179
33
129
Feb 1, 2007
#4
  • Feb 1, 2007
  • #4
GTOReturns said:
I thought it was the other way around. Changing to synthetics reveals leaks? What do you mean "clean up some seals"?
Click to expand...

Oh poop. You're right-on; I misread your post.

Switching to dino oil should present no issues I can think of (I've gone both ways with oil, and sometimes go back and forth).

The seal cleaning would have been if you had run dino for 100-120K and now were going to switch to synthetic (the detergents in synthetic might have cleaned some poop out of the seals).

Apologies for my misread.
 
G

GTOreturns

Well-Known Member
Oct 1, 2003
51
17
59
West Coast Best Coast
Feb 1, 2007
#5
  • Feb 1, 2007
  • #5
HISSIN50 said:
Oh poop. You're right-on; I misread your post.

Switching to dino oil should present no issues I can think of (I've gone both ways with oil, and sometimes go back and forth).

The seal cleaning would have been if you had run dino for 100-120K and now were going to switch to synthetic (the detergents in synthetic might have cleaned some poop out of the seals).

Apologies for my misread.
Click to expand...

No worries! Im losing a quart a week! Not burning it, it has minor leakage at the back of the pan but nothing major. My lower intake was never retorque after my T-Moss addition and have a feeling its getting out somewhere through the passages in the heads.
 

bigcat

start with the upper hole, and if more traction is
May 1, 2005
3,015
1
79
7200 feet
Feb 1, 2007
#6
  • Feb 1, 2007
  • #6
GTOReturns said:
No worries! Im losing a quart a week! Not burning it, it has minor leakage at the back of the pan but nothing major. My lower intake was never retorque after my T-Moss addition and have a feeling its getting out somewhere through the passages in the heads.
Click to expand...

a quart a week is not major leakage?

dude, you need to get that fixed.
 
G

GTOreturns

Well-Known Member
Oct 1, 2003
51
17
59
West Coast Best Coast
Feb 1, 2007
#7
  • Feb 1, 2007
  • #7
bigcat said:
a quart a week is not major leakage?

dude, you need to get that fixed.
Click to expand...

Nah, it doesnt leave a puddle? at all!
 

Mustang78

New Member
Feb 8, 2006
486
0
0
Aberdeen, WA
Feb 1, 2007
#8
  • Feb 1, 2007
  • #8
i switched to syntheic after 100K(i didnt actually know it was synthetic, it's the special high mileage stuff...i bought it thinking it would help) and now the rear main leaks like a sive! it sucks because it ruined my new clutch and i need to spend another weekend and more money replacing that stuff, not to mention i work every day till 5-7 and only have sundays off..

~Mark~
 

DonaldJP

Founding Member
Sep 27, 2002
95
0
6
Brooklet, Georgia
Feb 2, 2007
#9
  • Feb 2, 2007
  • #9
Hey my engine in my 5.0 has about 162,000 miles on it, and I am running Castrol Syntec Blend 10W30. Is this oil good for this engine or should I just use regular Syntec instead of the blend.
 

5.0 Nostalgia

10 Year Member
Feb 28, 2003
904
5
39
CT
Feb 2, 2007
#10
  • Feb 2, 2007
  • #10
WOW! I remember when you started posting here and your car had like 16,000 miles on it or something like that. Your car is a warrior!

If you're not burning or leaking any oil (other than the intake), I wouldn't see the need to go back to dino oil, although it wouldn't hurt. The intake leak obviously needs some attention. I would recommend getting an inspection mirror and checking that out.
 
G

GTOreturns

Well-Known Member
Oct 1, 2003
51
17
59
West Coast Best Coast
Feb 2, 2007
#11
  • Feb 2, 2007
  • #11
5.0 Nostalgia said:
WOW! I remember when you started posting here and your car had like 16,000 miles on it or something like that. Your car is a warrior!

If you're not burning or leaking any oil (other than the intake), I wouldn't see the need to go back to dino oil, although it wouldn't hurt. The intake leak obviously needs some attention. I would recommend getting an inspection mirror and checking that out.
Click to expand...

Actually it was 19,000 Yeah I drove 124 miles round trip to work 5 days a week. Runs like a charm though!
 

Mustang78

New Member
Feb 8, 2006
486
0
0
Aberdeen, WA
Feb 2, 2007
#12
  • Feb 2, 2007
  • #12
bummer, you probably could have bougth a honda gas saver for the price of a year's gas 124 miles a day..

~Mark~
 
G

GTOreturns

Well-Known Member
Oct 1, 2003
51
17
59
West Coast Best Coast
Feb 3, 2007
#13
  • Feb 3, 2007
  • #13
Mustang78 said:
bummer, you probably could have bougth a honda gas saver for the price of a year's gas 124 miles a day..

~Mark~
Click to expand...

Its pretty good on the highway. And thats all it was, highway driving.Stock it would get 24-25 MPG. After gears and stall converter it gets 20-21. Only had to deal with 1 traffic lite. Yeah it hurts a little just because of resale value I lost putting all that mileage on it but at the time I was looking for a beater DD and this crossed my path so I couldnt pass it up.
 
You must log in or register to reply here.

Similar threads

B
Engine Strange Noise
  • burntokita
  • May 8, 2026
  • Fox 5.0 Mustang Tech
Replies
8
Views
342
Fox 5.0 Mustang Tech May 11, 2026
keel
Oil choice for after break in period.
  • Sask84gt
  • Feb 28, 2026
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • 2
Replies
26
Views
921
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Mar 14, 2026
Praetorious
P
J
2001 coolant issue
  • jr273
  • Jan 24, 2026
  • The Welcome Wagon
Replies
1
Views
137
The Welcome Wagon Jan 24, 2026
Noobz347
B
Engine Another no start after washing engine bay
  • bruno
  • Apr 26, 2026
  • Fox 5.0 Mustang Tech
  • 2
Replies
24
Views
495
Fox 5.0 Mustang Tech May 7, 2026
AeroCoupe
P
Weird Voltage & Oil Pressure Gauges
  • PNN
  • May 22, 2026
  • SN95 V6 Mustang Tech
Replies
0
Views
33
SN95 V6 Mustang Tech May 22, 2026
PNN
P
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?