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15w40 for 99 vortec 350 4x4? #5058489
03/30/19 10:03 AM
03/30/19 10:03 AM
Joined: Jan 2014
Posts: 524
AZ
leroyd92 Offline OP
leroyd92  Offline OP

Joined: Jan 2014
Posts: 524
AZ
Is there anything special with vortec heads/systems that I should stay away from 15w40? Truck has 150k on it.

This is my first vortec motor, so I'd rather not do something silly right off the bat.


Supertech Junky
Re: 15w40 for 99 vortec 350 4x4? [Re: leroyd92] #5058546
03/30/19 11:21 AM
03/30/19 11:21 AM
Joined: Jul 2016
Posts: 1,929
Jacksonville, FL
FlyNavyP3 Offline
FlyNavyP3  Offline

Joined: Jul 2016
Posts: 1,929
Jacksonville, FL
Bad intake manifold gaskets, failed CFI injector (spider), or worn out distributor will stop your all iron 350 long before an oil choice will. There's very few bad choices thicker than 5w30 in a Small Block Chevrolet. Provided you keep the coolant out of the lip and don't fuel wash it when the injection acts up it will live a long life on Super Tech 5w30, 10W30, 10w40, 15w40, or 20w50.

15w40 in my opinion is a great oil for any generation SBC, Vortec included.


Luke
P-3C and P-8A Maritime Weapons and Tactics Instructor, Instructor Tactical Coordinator and Mission Commander
Re: 15w40 for 99 vortec 350 4x4? [Re: leroyd92] #5058596
03/30/19 12:25 PM
03/30/19 12:25 PM
Joined: Oct 2010
Posts: 7,343
Michigan
A_Harman Offline
A_Harman  Offline

Joined: Oct 2010
Posts: 7,343
Michigan
5w30 of any reputable brand will suit that engine just fine.
No need to run diesel oil in it.


1985 Z51 Corvette track car
2002 Camaro Z28 LS1/6-speed
2001 Dodge Ram 2500 diesel
1972 GMC 1500 shortbed project truck
Re: 15w40 for 99 vortec 350 4x4? [Re: leroyd92] #5058600
03/30/19 12:31 PM
03/30/19 12:31 PM
Joined: Oct 2015
Posts: 3,084
Balearic Islands , Spain
FordCapriDriver Offline
FordCapriDriver  Offline

Joined: Oct 2015
Posts: 3,084
Balearic Islands , Spain
If it's a roller cam engine literally any decent 30/40 grade would be just fine for it.


1975 Ford Capri II Ghia 3000 V6, - Shell Helix HX3 20W-50 w/ 20% Rimula R4X 15W-40 HDEO.
1988 Ford Escort XR3i Cabrio, - Shell Rimula R4X 15W-40
G40 Si-OAT coolant in both


Re: 15w40 for 99 vortec 350 4x4? [Re: leroyd92] #5058657
03/30/19 01:54 PM
03/30/19 01:54 PM
Joined: Sep 2013
Posts: 11,108
Indiana
dlundblad Offline
dlundblad  Offline

Joined: Sep 2013
Posts: 11,108
Indiana
For the most part, I've read here that they don't care for thick 40 weights.

5w30 or 10w30 is all they need. I'd entertain 0w40 as well.

Last edited by dlundblad; 03/30/19 01:55 PM.

03 Jeep WJ 4.0 202k Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 186k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 158k M1 EP 10w30 Supertech ST3980 (Ecore)

Re: 15w40 for 99 vortec 350 4x4? [Re: leroyd92] #5058664
03/30/19 02:07 PM
03/30/19 02:07 PM
Joined: Oct 2014
Posts: 1,520
NoVA
Jimzz Offline
Jimzz  Offline

Joined: Oct 2014
Posts: 1,520
NoVA
I'd start with a 10w30 High mileage oil first and see how that goes.


yup
Re: 15w40 for 99 vortec 350 4x4? [Re: dlundblad] #5058665
03/30/19 02:07 PM
03/30/19 02:07 PM
Joined: Apr 2018
Posts: 481
US
talest Offline
talest  Offline

Joined: Apr 2018
Posts: 481
US
Originally Posted by dlundblad
For the most part, I've read here that they don't care for thick 40 weights.

5w30 or 10w30 is all they need. I'd entertain 0w40 as well.


Why entertain a 0W40 when it says 5w30 on cap? Maybe entertain 0w30

Last edited by talest; 03/30/19 02:07 PM.
Re: 15w40 for 99 vortec 350 4x4? [Re: leroyd92] #5058671
03/30/19 02:16 PM
03/30/19 02:16 PM
Joined: Jul 2005
Posts: 11,768
Maricopa Arizona
dave1251 Offline
dave1251  Offline

Joined: Jul 2005
Posts: 11,768
Maricopa Arizona
Originally Posted by leroyd92
Is there anything special with vortec heads/systems that I should stay away from 15w40? Truck has 150k on it.

This is my first vortec motor, so I'd rather not do something silly right off the bat.



If you have the 15W40 on hand go ahead and use it.


make the inside of your engine oil cap white.
don't use.
Re: 15w40 for 99 vortec 350 4x4? [Re: leroyd92] #5058678
03/30/19 02:24 PM
03/30/19 02:24 PM
Joined: Apr 2017
Posts: 1,962
San Rafael, CA
dogememe Offline
dogememe  Offline

Joined: Apr 2017
Posts: 1,962
San Rafael, CA
Anything from 0w-30 to 15w-40 will work fine, but I'd stick with a 30-weight if you don't have any consumption or leaking issues. I've owned many SBCs.

Last edited by dogememe; 03/30/19 02:24 PM.

2010 Ford Escape 2.5 ~96K Miles
Valvoline 5W-20 from Valvoline Instant Oil Change.
Re: 15w40 for 99 vortec 350 4x4? [Re: leroyd92] #5058714
03/30/19 03:22 PM
03/30/19 03:22 PM
Joined: Sep 2006
Posts: 11,174
Bad Axe, MI
daman Offline
daman  Offline

Joined: Sep 2006
Posts: 11,174
Bad Axe, MI
You don't need anything that thick! my '99 with 235,000 lived on 0w30.


"Always"....Mobil 1

Current fill: AFE 0w30
Re: 15w40 for 99 vortec 350 4x4? [Re: leroyd92] #5058753
03/30/19 04:16 PM
03/30/19 04:16 PM
Joined: Aug 2017
Posts: 62
OH
08z06 Offline
08z06  Offline

Joined: Aug 2017
Posts: 62
OH
Rotella 5w40

Re: 15w40 for 99 vortec 350 4x4? [Re: daman] #5058812
03/30/19 06:06 PM
03/30/19 06:06 PM
Joined: Jul 2005
Posts: 11,768
Maricopa Arizona
dave1251 Offline
dave1251  Offline

Joined: Jul 2005
Posts: 11,768
Maricopa Arizona
Originally Posted by daman
You don't need anything that thick! my '99 with 235,000 lived on 0w30.



15W40 isn't thick and it won't hurt a thing in Arizona.


make the inside of your engine oil cap white.
don't use.
Re: 15w40 for 99 vortec 350 4x4? [Re: leroyd92] #5058814
03/30/19 06:06 PM
03/30/19 06:06 PM
Joined: Feb 2011
Posts: 1,341
Golden Meadow, LA
mobilaltima Offline
mobilaltima  Offline

Joined: Feb 2011
Posts: 1,341
Golden Meadow, LA
FlyNavyP3, do you think 15W40 is good for even the 4.8 and 5.3 Vortecs? Considering it in a 4.8 Vortec with VVT with 180k miles and just letting the OLM hit 0% from here on out.


2006 2500 Dodge 5.9 Cummins Mobil Delvac 15W40, Fleetguard Stratapore 90k miles
Early '99 F250 ECLB 7.3 Stroker, 223k miles
Re: 15w40 for 99 vortec 350 4x4? [Re: mobilaltima] #5058825
03/30/19 06:12 PM
03/30/19 06:12 PM
Joined: Jul 2005
Posts: 11,768
Maricopa Arizona
dave1251 Offline
dave1251  Offline

Joined: Jul 2005
Posts: 11,768
Maricopa Arizona
Originally Posted by mobilaltima
FlyNavyP3, do you think 15W40 is good for even the 4.8 and 5.3 Vortecs? Considering it in a 4.8 Vortec with VVT with 180k miles and just letting the OLM hit 0% from here on out.



It will work fine because the engine isn't picky not so much the oil.


make the inside of your engine oil cap white.
don't use.
Re: 15w40 for 99 vortec 350 4x4? [Re: mobilaltima] #5058828
03/30/19 06:15 PM
03/30/19 06:15 PM
Joined: Feb 2008
Posts: 1,203
PA
umungus1122 Offline
umungus1122  Offline

Joined: Feb 2008
Posts: 1,203
PA
Originally Posted by mobilaltima
FlyNavyP3, do you think 15W40 is good for even the 4.8 and 5.3 Vortecs? Considering it in a 4.8 Vortec with VVT with 180k miles and just letting the OLM hit 0% from here on out.

I'd just use a syn like Mobil 1 10w-30HM or 0w-40 in LA, especially if you can get it on a rebate like Mobil 1 if you want to do longer drains. If you can get the 15w-40 for cheap though, it will work fine too.


'95 Chevy 1/2t 305 208k -NexGen Maxlife 5w-30, Wix filter
'89 Jeep Comanche 4.0 5spd 285k - GC 0w-30, Bosch LongLife filter
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