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

POLL: which weight oil do you all use???

  • Thread starter Thread starter noslow5_0
  • Start date Start date Mar 29, 2004
Prev
  • 1
  • 2
  • 3
Next
First Prev 2 of 3 Next Last

DavidF

New Member
Nov 19, 2003
158
0
0
Ventura, Ca
Mar 30, 2004
#21
  • Mar 30, 2004
  • #21
Castrol 20w50
 
S

Schlodes

Founding Member
Feb 26, 2001
354
0
0
Lidsville.... West side dawg..
Mar 30, 2004
#22
  • Mar 30, 2004
  • #22
Castrol GTX 10W30 NON synth... Also a 500 ml bottle of GM Engine oil supplement in every oil change. I swear by this stuff.

Back in April of 1999 I when I had my T Type, I had a motor redone by a place in Toronto and on the way home in the T, it wiped the thrust bearing. The shop [their initials are N P - for Buick guys on here] told me to drive it like that and that I was hearing things, and if it broke in the 3 months they guaranteed the engine they'd fix it... Basically "get lost....".

I couldnt afford another rebuild, and this was my only car. So, I tried to blow the motor up just wiht my normal driving and lotsa track visits. A guy I knew recommended the GM EOS just incase it outlasted 3 months... It lasted all season.. and best that year was a 1.61, 12.40 @ 105 with the crank ready to come apart. But it was really clunking at the end there. In 2000 when I built my own motor to put in, we pulled this one apart and I can't believe bad things didn't happen from crank walk because you could take the thrust bearing, place it inside its journal in the crank, and move it up and down and it would make a "bing bing bing" noise and there was quite the gap in there

Soooo thats just what I run. the GTX 10W30 and 500ml of GM EOS.
 

colemanitis

Member
Apr 1, 2003
145
0
16
Panama City, FL
Mar 30, 2004
#23
  • Mar 30, 2004
  • #23
10w30
 

whitemustang89

Member
Dec 15, 2003
166
0
17
in the sticks of arkansas
Mar 30, 2004
#24
  • Mar 30, 2004
  • #24
i like to use 20w-50 for everything so that way i dont have any worries about it breakin down
 
B

Blowfish

New Member
Feb 4, 2004
11
0
0
S.F. bay area
Mar 30, 2004
#25
  • Mar 30, 2004
  • #25
Ive used Valvoline synpower 5-40 in my stang for ever and have no complaints or smoke. good luck
 

shawn13

New Member
Feb 28, 2004
70
0
0
Dwight IL
Mar 30, 2004
#26
  • Mar 30, 2004
  • #26
I use 20-50 val.your not suking oil threw the pvc are you Iseen u have a gt40 lower I seen some one else talking bout that on here
 

The Shape

Founding Member
Jan 11, 2002
2,224
8
49
East ARKANSAS Delta
Mar 30, 2004
#27
  • Mar 30, 2004
  • #27
I have been thinking about switching to 20W-50 in my car because the summers here are pretty bad. It hovers int he high 90,s with very high humitidy. I have decent pressure like 25 at idle and about 40-45 at 2K rpm's. I am just wondering if switching to 20W-50 will put any extra strain on my 115K mile oil pump?
 

ECU5.0

Banned
Jan 10, 2004
1,803
1
0
raleigh, nc
Mar 30, 2004
#28
  • Mar 30, 2004
  • #28
valvoline 10w40 or high mileage 10w40
 

Stanger007

Founding Member
Sep 26, 2001
2,015
2
46
Baton Rouge, LA
Mar 30, 2004
#29
  • Mar 30, 2004
  • #29
noslow5_0 said:
so running a slightly heavier oil wont cure my very tiny oil burning problem???the motor only has like 2000 miles on it.... i dont know whats going on. it didnt do this till i fixed every vacum leak on it...
Click to expand...

Are you losing oil through your PCV?

Anyways, Valvoline 10w30 Synthetic here
 

subcreep

New Member
Dec 1, 2003
30
0
0
Jax, FL
Mar 30, 2004
#30
  • Mar 30, 2004
  • #30
mobil 1 15-50 Jax, FL gets HOT in the summertime and I like to keep the thicker stuff in it.
 
N

noslow5_0

New Member
Nov 7, 2003
422
0
0
dallas tx.
Mar 30, 2004
#31
  • Mar 30, 2004
  • #31
well i dont know if i am loosing oil through there or not.... i unscrewed the oil filler cap, and it wasnt smoking or anything, but once i reved it up, just a little tiny smoke would come out....
 

Stanger007

Founding Member
Sep 26, 2001
2,015
2
46
Baton Rouge, LA
Mar 30, 2004
#32
  • Mar 30, 2004
  • #32
you should be able to pull the pcv valve off and see if oil is on it. Make sure you have the screen in that that sits down in the hole below the PCV. The PCV sucking oil is fairly typical for these cars.
 

blown93feature

New Member
Dec 9, 2003
151
0
0
living on edge like the motor
Mar 30, 2004
#33
  • Mar 30, 2004
  • #33
I use 15w50 full synthetic mobil 1.The oil pressure at idle is around 45 no matter what temp.
 

siege

New Member
Feb 23, 2003
651
0
0
Peoria, AZ
Mar 30, 2004
#34
  • Mar 30, 2004
  • #34
hmm...so thicker oil helps keep oil pressure up then? wish I woulda known that 4 days ago when I changed my oil with the usual motorcraft 10w30

...pressure likes to dip now and again, and its hot as hell here
 

YELLOWLXCOUPE

Founding Member
Jun 3, 2001
236
0
0
Binghamton, NY
Mar 30, 2004
#35
  • Mar 30, 2004
  • #35
20w-50 kendall gt-1 green when it goes in ... brown when it comes out lol
 

saniutza

New Member
Oct 28, 2003
147
0
0
born in Transylvania, Romania...live in Lusby,MD
Mar 30, 2004
#36
  • Mar 30, 2004
  • #36
my mechanic told me to use 20-50 or close to it to resolve my burning oil problem.. i don't have any probs with the rings or the valve seals... it just burns some like all 5.0 do... soon getting the CHP 347 stroker
 

Kdubslugga

Active Member
Jun 7, 2003
1,515
3
38
Akron, OH
Mar 30, 2004
#37
  • Mar 30, 2004
  • #37
10w30 Redline Synthetic Here
 

TwinTurbo93

Founding Member
Jan 19, 2002
153
0
0
Orlando
Mar 30, 2004
#38
  • Mar 30, 2004
  • #38
10W30 mobil 1 synthetic
 
H

Horsepower67

New Member
Feb 1, 2004
62
0
0
Mar 30, 2004
#39
  • Mar 30, 2004
  • #39
I use Valvoline 20/50 Racing. Of course my engine has 159,000 miles on it, so my tolerances are a whole lot looser than most....
I have been using this in a well built 351W roller motor (similiar to 1st gen Lightning) as well. Engine only has maybe 3000 mile son it tops, should I be running thinner oil, or synthetic?
Well-reputed local hot-rod shop I know of uses Valvoline 20/50 Racing in everything they build. The tolerances are incredibly tight in their engines, and they still choose 20/50. Dunno what that means, maybe because most of the engines they build are designed to make big HP's and spin hard.
 

Mike86Stang

Advanced Member
Apr 11, 2000
10,296
0
77
Red Lion, PA
Mar 30, 2004
#40
  • Mar 30, 2004
  • #40
Well for me I use 10w-30 in the winter , & 20w-50 for the summer. This winter we got down to -12 degree's at one point & last summer we hit peaks of over 104 degree's.

If you've ever tried to pour 20w-50 when it's 30 degree's outside you'll know why I'd never run it in the winter. Worse than molassas lol.

BTW I alwasy use Castrol non synthetic in all my cars never had an issue.Oh & I also have HV oil pump just incase
 
Prev
  • 1
  • 2
  • 3
Next
First Prev 2 of 3 Next Last
You must log in or register to reply here.

Similar threads

Y
Engine 1994 Ford Mustang Gt Rod Knock/Stuck Lifter
  • yaboity
  • Jun 7, 2025
  • 1994 - 1995 Specific Tech
Replies
2
Views
271
1994 - 1995 Specific Tech Jun 8, 2025
AeroCoupe
S
Drivetrain 8.8 Pinion and 302 rear main seal leaks after replacing. 93 5.0 with t-5
  • Steigy4827
  • Jun 23, 2025
  • Fox 5.0 Mustang Tech
Replies
10
Views
657
Fox 5.0 Mustang Tech Apr 1, 2026
Steigy4827
S
K
Engine 2000 Mustang GT - Fuel issue post-blown spark plug repair
  • kenster1092
  • Feb 26, 2026
  • SN95 4.6L Mustang Tech
Replies
4
Views
340
SN95 4.6L Mustang Tech Mar 10, 2026
kenster1092
K
3
Eight inches is enough for me...
  • 351MooseStang
  • Nov 27, 2025
  • 1974 - 1978 Mustang II Talk & Tech
Replies
5
Views
565
1974 - 1978 Mustang II Talk & Tech Mar 2, 2026
Bullitt347
0
V6 to V8 Swap info
  • 02_2v_Curtis
  • Jan 11, 2026
  • 1996 - 2004 SN95 Mustang -General/Talk-
Replies
0
Views
694
1996 - 2004 SN95 Mustang -General/Talk- Jan 11, 2026
02_2v_Curtis
0
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?