10w30 or 10w40

Mopar1 · 08-06-2002, 08:15 AM

Which weight is best for ford engines, Im running 10w40 rite now

Mach 1 · 08-06-2002, 01:10 PM

10W30, as it says in your owners manual, for your engine.

Maroon 5.0 LX · 08-06-2002, 01:47 PM

10-30

Blue GT 5.0 · 08-10-2002, 12:13 AM

Motorcraft 10-30 to be specific. (According to the manual)

PKRWUD · 08-10-2002, 03:00 AM

For your engine, in your climate, I'd run Mobil 1 10w40 until October, and then switch to Mobil 1 10w30. For a stocker, 10w30 is fine.

Take care,
~Chris

Mach 1 · 08-10-2002, 05:12 AM

Chris: just wondering why you would run 10w40 in a motor that is stock except being .030 over?

PKRWUD · 08-10-2002, 06:33 AM

Because it's far from stock.

I'll let him share the details.

Take care,
~Chris

Mach 1 · 08-10-2002, 07:08 AM

Ok, even if it is far from stock, why the heavier oil?

PKRWUD · 08-10-2002, 07:24 AM

Because from what he told me, the builder that put that engine together had racing in mind, and I'm willing to bet that he was a little more generous with the bearing clearances than a person would have with a stock engine. Not necessarily loose, but on the loose side. For example, if he was looking for a clearance between .0005" and .0025", he likely went with .0025". I don't know this for a fact, but I do know that the builder was experienced, and my experience leads me to believe he might have done things this way. If he did, than this engine will be happier with 10w40 during the warmer months, IMHO.

Take care,
~Chris

Mach 1 · 08-10-2002, 07:38 AM

Is there a reason engine builders go on the loose side with bearing clearances on race engines?

PKRWUD · 08-10-2002, 07:48 AM

If you were running down the street, as fast as you could (let's say running for your life), would you rather be wearing Jordache-tight jeans or a jogging suit?

Take care,
~Chris

Mopar1 · 08-10-2002, 08:38 AM

Thanks for the help guys as always. I do have the AFM Typhoon intake on the way. Ill get a chassis dyno when that is on. Next mods will be headers then 75mm or so maf to finish unchoaking the engine. Then ill go from there.

PKRWUD · 08-10-2002, 09:35 AM

Quote:

Originally posted by Mopar1
Then ill go from there.

Hehehe, yeah you will.

Take care,
~Chris

08-06-2002, 08:15 AM	#1
Mopar1 Registered Member Join Date: Mar 2002 Location: Lakewood, Wa Posts: 161	10w30 or 10w40 Which weight is best for ford engines, Im running 10w40 rite now __________________ '77 Aspen R/T: 318 w/273 heads, 4spd, Hurst Shifter, 600 holley, edelbrock intake, 8 3/4 axle, 3.23 sure-grip, dual 3" exhaust, MP cam 276 / 276 duration 490 / 490 mech solid lifter, Super Stock Springs (15.65@88 3900lbs) '91 Mustang LX: .030 Bored, Typhoon Intake, 4.10's, Lentech VB, BBK 70mm TB, FMS A/C elim bracket, 19lbs inject, off road H-pipe, 75mm pro-m MAF, FRP unequal shorty, stormin normin hood. 3420 Lbs w/ 220 (me) and 13 gal gas. '02 SS Camaro

08-06-2002, 01:10 PM	#2
Mach 1 Registered Member Join Date: May 1999 Location: Georgia Posts: 3,866	10W30, as it says in your owners manual, for your engine. __________________ 2002 GT 1993 GT (SOLD) '93 Mustang GT RHC member #142

08-06-2002, 01:47 PM	#3
Maroon 5.0 LX Registered Member Join Date: Mar 2001 Location: Southern Maryland Posts: 471	10-30 __________________ '89 LX 5.0 - 5 speed. Original Owner '94 E-150 4.9 Hi-Top Conversion Van '06 Mustang V-6, 5 speed

08-10-2002, 03:00 AM	#5
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	For your engine, in your climate, I'd run Mobil 1 10w40 until October, and then switch to Mobil 1 10w30. For a stocker, 10w30 is fine. Take care, ~Chris __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

08-10-2002, 05:12 AM	#6
Mach 1 Registered Member Join Date: May 1999 Location: Georgia Posts: 3,866	Chris: just wondering why you would run 10w40 in a motor that is stock except being .030 over? __________________ 2002 GT 1993 GT (SOLD) '93 Mustang GT RHC member #142

08-10-2002, 12:13 AM	#4
Blue GT 5.0 Registered Member Join Date: Feb 2002 Location: McSherrystown PA (near Gettysburg) Posts: 26	Motorcraft 10-30 to be specific. (According to the manual)

08-10-2002, 06:33 AM	#7
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	Because it's far from stock. I'll let him share the details. Take care, ~Chris __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

08-10-2002, 07:08 AM	#8
Mach 1 Registered Member Join Date: May 1999 Location: Georgia Posts: 3,866	Ok, even if it is far from stock, why the heavier oil? __________________ 2002 GT 1993 GT (SOLD) '93 Mustang GT RHC member #142

08-10-2002, 07:24 AM	#9
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	Because from what he told me, the builder that put that engine together had racing in mind, and I'm willing to bet that he was a little more generous with the bearing clearances than a person would have with a stock engine. Not necessarily loose, but on the loose side. For example, if he was looking for a clearance between .0005" and .0025", he likely went with .0025". I don't know this for a fact, but I do know that the builder was experienced, and my experience leads me to believe he might have done things this way. If he did, than this engine will be happier with 10w40 during the warmer months, IMHO. Take care, ~Chris __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

08-10-2002, 07:38 AM	#10
Mach 1 Registered Member Join Date: May 1999 Location: Georgia Posts: 3,866	Is there a reason engine builders go on the loose side with bearing clearances on race engines? __________________ 2002 GT 1993 GT (SOLD) '93 Mustang GT RHC member #142

08-10-2002, 07:48 AM	#11
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	If you were running down the street, as fast as you could (let's say running for your life), would you rather be wearing Jordache-tight jeans or a jogging suit? Take care, ~Chris __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

08-10-2002, 08:38 AM	#12
Mopar1 Registered Member Join Date: Mar 2002 Location: Lakewood, Wa Posts: 161	Thanks for the help guys as always. I do have the AFM Typhoon intake on the way. Ill get a chassis dyno when that is on. Next mods will be headers then 75mm or so maf to finish unchoaking the engine. Then ill go from there. __________________ '77 Aspen R/T: 318 w/273 heads, 4spd, Hurst Shifter, 600 holley, edelbrock intake, 8 3/4 axle, 3.23 sure-grip, dual 3" exhaust, MP cam 276 / 276 duration 490 / 490 mech solid lifter, Super Stock Springs (15.65@88 3900lbs) '91 Mustang LX: .030 Bored, Typhoon Intake, 4.10's, Lentech VB, BBK 70mm TB, FMS A/C elim bracket, 19lbs inject, off road H-pipe, 75mm pro-m MAF, FRP unequal shorty, stormin normin hood. 3420 Lbs w/ 220 (me) and 13 gal gas. '02 SS Camaro