Engine 88 got oil question

Comp Cam

Member
Jan 11, 2019
41
2
8
22
Lenexa,kansas
What's up, so it's time to change the oil in my GT. It's HCI bigger throttle body rockers and Pushrods with gt40 heads. For some odd reason he used 20w 50 racing oil in it for a recent oil change (before I bought it). Unless he's trying to hide unwanted noise (witch I fear). Should I go ahead and use 10w 30 or stick with w20 50 instead?
 
  • Sponsors(?)


John Dirks Jr

there is enough sticking out to grab on to
5 Year Member
Jun 28, 2013
2,775
1,171
174
56
Maryland
Some engines are built with slightly more bearing clearance for racing purposes. I dont have a technical explanation for why. The 306 in my 93 vert was built that way by a previous owner. If I run 10-30 in that motor, hot idle pressure drops too low for my liking. So I run 20-50 Mobil1 full synthetic and its perfect. My 92 was built with factory spec bearing tolerance and I run 10-30 in it.
 

Wayne Waldrep

Before I post a pic, do you have one of yours?
15 Year Member
Apr 14, 2003
875
450
83
53
Cuba, AL
My original engine went 248k miles. All it ever had in it was Castrol 20w-50 conventional. Like has been said above, either is fine.
 

Mustang5L5

i'm familiar with penetration
Mod Dude
Feb 18, 2001
33,056
9,203
224
Massachusetts
Can you put a good oil pressure gauge on the car and see what you have for pressure now, and then see what you have if you change to 10W-30? That will likely give you the answer you need once you see how the different oil affects pressure (either cold or hot)
 

mikestang63

SN Certified Technician
Aug 27, 2012
9,901
6,685
204
In the garage
as long as you dont live in a cold climate, you can run it fine. Just to throw you a curve ball, I've been running Rotella 15w40 in my N/A fox body cars for decades and 20w50 castrol in my supercharged ones.
 

John Dirks Jr

there is enough sticking out to grab on to
5 Year Member
Jun 28, 2013
2,775
1,171
174
56
Maryland
Correction. Above I said I run 20-50 Mobil1. They dont make it. It's 15-50. Doh!
 
Thread starter Similar threads Forum Replies Date
The Shape Got a question about installing a Mechanical Oil pressure gauge. Fox 5.0 Mustang Tech 17
Starscream88 Got another question for you blower peeps, Where and how did you do your oil return? Fox 5.0 Mustang Tech 9
65-Fstbk Rebuilt the 5.0 but it's got an oil leak 1965 - 1973 Classic Mustangs -General/Talk- 6
J Finally Got Foxbody But Having Oil Leak Probe..help Fox 5.0 Mustang Tech 1
1 it's got oil 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 5
85_SS_302_Coupe Ever have problems getting the oil pump shaft out? I've got your hook up... Fox 5.0 Mustang Tech 7
2L8ULUZ2 Got Some Oiling Issues! Need Help! 1994 - 1995 Specific Tech 8
IMPORTSMOKER got oil in my coolant reservour...... Fox 5.0 Mustang Tech 0
BlueOvalStangGT HEY CAR IS RUNNING!! Got a few problems, overheating, oil leak,HIT 5#'s!!! 1994 - 1995 Specific Tech 9
68GEETEE got the oil pan off but........ Classic Mustang Specific Tech 2
J installed high volume oil pump, got a ? though Classic Mustang Specific Tech 4
Andresquintana.mma Fox Just got a 93! 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 24
N Bought a unfinished 5.4 dohc into 97 gt project. I)ve got lots of questions. The Welcome Wagon 2
C Hi guys i just got a 2003 mustang gt 4.6 how do check kow it the car has pi heads SN95 4.6L Mustang Tech 6
M Progress Thread .351 roller, cam bearing cracks, I've got em #2 & #4 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 1
C Just got a 1990 lx notchback. I need help please 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 10
DudeStang Progress Thread Finally got my first Fox Body - 1988 GT 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 360
Twitch'n Twitcht4life My P.M.S. got stolen from my car. Hey 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 1
mattbaker302 Gots me a 351 Cleveland 1965 - 1973 Classic Mustangs -General/Talk- 12
R Have I got two faults SN95 V6 Mustang Tech 28
J Electrical finally got my head lights SN95 4.6L Mustang Tech 0
joetrainer31 Progress Thread Got Another One! Pics Fox 5.0 Mustang Tech 90
79 Fox Fox Got a problem... What is going on? 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 7
79 Fox Fox Finally got my Fox running! 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 0
S Engine Got a 93 mustang gt overheat on idle Fox 5.0 Mustang Tech 2
1970machwon Engine A couple MAF questions (Finally got my donor engine!) Fox 5.0 Mustang Tech 6
RangerJoe Fox New PB, finally got into the 10's! 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 20
C Finally got this horse to pass NJ inspection !!! SN95 4.6L Mustang Tech 3
J Cheap fix for front bumper that broke off when I got the car stuck in a ditch. 2015+ (S550) Mustang -General/Talk 4
R 04 GT. JUST GOT IT. The Welcome Wagon 1
CarMichael Angelo Well, I just got poked in the heart... 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 18
R Please Help has anyone got image of wires The Welcome Wagon 0
John Dirks Jr What you got? 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 6
W Hi All, Just got a 2002 mustang. It has 16 inch wheels and tires on it. Thinking about buying 18x9 front and 18x10 rear, any advice? 1996 - 2004 SN95 Mustang -General/Talk- 2
8 Just got my 2nd fox!! The Welcome Wagon 3
tessatrolo Got a wiring problem SN guys please help! 1996 - 2004 SN95 Mustang -General/Talk- 0
TNAVY Finally got a Cobra (my dream car!) The Welcome Wagon 1
C Hello from Texas. I am an old Street Rod builder who got serious about Mustangs years ago. The Welcome Wagon 5
R Finally Got to Mustang Week 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 1
mpeach1976 I got popped by police for my exhaust 2005 - 2014 S-197 Mustang -General/Talk- 2
J Engine 1994 GT not sure what I got here ... SN95 4.6L Mustang Tech 1
H 1986 got some turbo questions. 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 5
S After 20 years, I got my Mustang. The Welcome Wagon 1
S Just got 18 GT. Ambient Light/ Primary/ Secondary color settings do not save when turned off. 2015+ (S550) Mustang -General/Talk 5
Steel1 Got myself a Fathers Day present 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 3
Z Just got stanged 2005 - 2014 S-197 Mustang -General/Talk- 1
G Paint and Body Spring is finally here and got the car cleaned up. 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 2
Justin Fetalvero Just Got A Free 1994 Mustang V6! The Welcome Wagon 3
Mustang Yawie Wow, It’s Been A While But Finally Got A Mustang Back 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 6
E Just Got A 74 Mach1 1974 - 1978 Mustang II Talk & Tech 11
Similar threads