What weight oil you guys running?

1hot87gt

Well-Known Member
Mar 17, 2017
186
141
63
50
New York
Getting ready to change engine and supercharger oil for the spring. I’m good with the supercharger oil, but wondering what weight oil most of you guys are running in your Foxes. If I remember the last couple of years I’ve run RP 10w40.
 
  • Sponsors(?)


96pushrod

Mustang Master
May 15, 2018
868
529
103
28
Savannah
I’ve been getting good deals on vr1 in 10w-30 so I run that. I’ve never really seen a purpose in running anything heavier than 30w unless spec’d by a builder.
 

revhead347

Just rub Vaseline all over
15 Year Member
Jun 14, 2004
8,423
1,218
214
40
Acworth, GA
Factory oil is 10W-30. Walmart sells a 5qt bottle of Mobil One for $23.88. Don't over think it. These are dinosaur engines; just stick to the factory recommendation and don't worry about it. If the engine has a bunch of blow by because it's worn out, then address possibly putting an additive in there to help mitigate the problem.

Kurt
 

Shakerhood

15 Year Member
Oct 28, 2004
3,267
169
114
Ohio
The past few years I have been putting 5W-30 in for Winter and 10W-30 for Spring, Summer, and Fall.
 

1hot87gt

Well-Known Member
Mar 17, 2017
186
141
63
50
New York
Ok guys, great, and thank you. I ordered 4 quarts of Royal Purple HMX high mileage 10w30 and I also have a quart of Lucas oil stabilizer. Thanks again for the replies.
 

kiddiccarus

The first widely accepted Tranny
15 Year Member
Dec 24, 2003
1,292
737
133
30 Mins from a Ragged GT
www.angelfire.com
+1 on the 5w30 Mobile. These engines, even though we are increasing our #'s are still street machines. Making sure you have the proper intervals on the change is the real key. Change the oil and save the engine.
 

1hot87gt

Well-Known Member
Mar 17, 2017
186
141
63
50
New York
Honestly, that is what I use the Lucas additive is for. It thickens up the oil a bit, quiets the valve train, cuts back on blow by, which isn’t a major issue because the motor is pretty tight, and just overall I believe improves the oils ability to lubricate and protect. But I’m no expert. Just my .02
 

Rdub6

Mustang Master
Dec 29, 2017
1,608
1,189
123
Long Island, NY
10/30 Mobil 1 here. +1 on the Walmart 5 quart jug. Can’t beat that price anywhere (plus the old oil goes right back in the jug)
 

96pushrod

Mustang Master
May 15, 2018
868
529
103
28
Savannah
I'm surprised no one is plugging 10W-40. Won't the thicker oil cut down on valve train chatter?
No. If anything I’ve noticed my lifters make more noise on colder days when the oil is colder and thicker.

Most all roller lifter sbf engines are designed to run 5w-30 or 10w-30, either works. Unless you have things which have been done to put you into the 1% of people who need a different weight, I would just stick to these.
 

Habu135

Advanced Member
Jan 10, 2019
606
385
73
40
California
No. If anything I’ve noticed my lifters make more noise on colder days when the oil is colder and thicker.

Most all roller lifter sbf engines are designed to run 5w-30 or 10w-30, either works. Unless you have things which have been done to put you into the 1% of people who need a different weight, I would just stick to these.
What about if you live in the southwest where temperatures in the summer are 100+?
 

96pushrod

Mustang Master
May 15, 2018
868
529
103
28
Savannah
What about if you live in the southwest where temperatures in the summer are 100+?
I’d still use 10w-30. It gets pretty damn hot down here and I’ve never seen any issues.

You could look at the oil pressure you make at full throttle once the weather gets hot. I’d be willing to bet it’s within a couple pounds as a hot engine when it’s cold.
 

1hot87gt

Well-Known Member
Mar 17, 2017
186
141
63
50
New York
Habu135. You daily that Fox? I live in the Northeast. We usually don’t hit 100+, but it can get real hot sometimes in the summer. And i know when it does, I don’t even touch my car. It just sits in the garage under its cover. And it has AC! Lol.

Btw, how are you guys doing out there with the virus? I’m from NY. Not the city, but out on Long Island. I’m in the food distribution business so I’m considered ‘essential’ and still working supplying the supermarkets. Really scary. Pray they get this under some type of control soon.
 
Thread starter Similar threads Forum Replies Date
madspeed Forced Induction Turbo Guys... Oil Weight? Fox 5.0 Mustang Tech 15
1 Engine 1995 Mustang GT 1994 - 1995 Specific Tech 0
G Notchback Coolant And Oil Weight 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 10
DomMc Oil Weight?! 1974 - 1978 Mustang II Talk & Tech 5
Killa 5w30 Instead Of 10w30 Oil Weight ? 1994 - 1995 Specific Tech 30
Killa 1995 mustang gt 5.0L oil weight Classic Mustang Specific Tech 2
93lxSaleenclone oil weight question Fox 5.0 Mustang Tech 8
paintballpyro1 Oil weight and car smoking SN95 4.6L Mustang Tech 6
Flavadave4 What weight engine oil do you run? 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 28
BlackOnBlackCobra96 Oil weight for '96 Cobra with Vortech? SVT Tech Forum 3
9 what weight gear oil for rear end? 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 2
jcode68 What oil weight should I be using and why? Classic Mustang Specific Tech 14
GroverDill Oil weight? 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 14
MysteryMachine Oil weight idea 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 10
Killa What is the highest oil weight you can put in your 4.6L ? SN95 4.6L Mustang Tech 13
Killa Im kinda confuse on oils weight. SN95 4.6L Mustang Tech 5
Killa I need help running some heavy weight oil please SN95 4.6L Mustang Tech 10
cenok is family how much gear oil and what weight in rearend 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 6
jcw88 what weight oil?? Fox 5.0 Mustang Tech 1
1992 2.3LX How muh oil and what weight? SN95 V6 Mustang Tech 2
P gear oil weight ? SN95 4.6L Mustang Tech 7
Tripoli What oil weight? SN95 4.6L Mustang Tech 3
S What weight oil for tranny? Fox 5.0 Mustang Tech 9
gktbay Oil weight ... what to use? Fox 5.0 Mustang Tech 4
rustang94 What weight oil do you use?? 1994 - 1995 Specific Tech 20
3 What weight of oil for Tranmission and differential?? Fox 5.0 Mustang Tech 3
stang730 Which oil weight? Fox 5.0 Mustang Tech 15
NOSNotch What weight oil? Fox 5.0 Mustang Tech 15
jes72mustang QUICK!!! What Weight Gear Oil? Classic Mustang Specific Tech 1
RYC CUKR What weight gear oil for 93 8.8" Fox 5.0 Mustang Tech 2
S supercharger oil weight? SN95 4.6L Mustang Tech 3
5spd GT So what do all the different oil weight numbers mean? Fox 5.0 Mustang Tech 5
JTGrant what weight oil? 06 Mustang GT 2005 - 2009 Specific Tech 23
The Shape Oil Weight Survey Fox 5.0 Mustang Tech 28
M What Oil weight to use? Fox 5.0 Mustang Tech 19
MO351 Oil weight question Fox 5.0 Mustang Tech 11
jes72mustang What Weight Oil Classic Mustang Specific Tech 5
8 Brand/Weight Oil? 2.3L (N/A & Turbo) Tech 10
L What kind/weight oil comes in a T-45 stock?? SN95 4.6L Mustang Tech 10
8 New Motor, What Brand/Weight Oil? 2.3L (N/A & Turbo) Tech 1
SonicBlue2v03GT Question - Has anyone changed weight of oil after Supercharging?? SN95 4.6L Mustang Tech 1
D oil weight SN95 4.6L Mustang Tech 11
N Oil Brand & Weight Revistited Classic Mustang Specific Tech 6
M Can you mix two different weight Mobil 1 sythetic oils? Fox 5.0 Mustang Tech 8
jaidedeye what type a weight of oil? Fox 5.0 Mustang Tech 3
N POLL: which weight oil do you all use??? Fox 5.0 Mustang Tech 42
0 What oil weight to use for Rear Gear??? SN95 4.6L Mustang Tech 1
T Weight of oil?! SN95 4.6L Mustang Tech 1
IndyBlk5.0 what weight of synthetic gear oil/transmission fluid/ engine oil? Fox 5.0 Mustang Tech 9
U What weight Oil for 5.0 RearEnd Fox 5.0 Mustang Tech 2
Similar threads