What weight oil for a GM 350 HO crate? - Corvette Forum

Go Back   >
Log In 
Register FAQ Search Today's Posts Mark Forums Read Vendor Directory

C3 General
General C3 Corvette Discussion not covered in Tech Sponsored by
Corvette America

What weight oil for a GM 350 HO crate?

Reply
 
 
 
Thread Tools Search this Thread
Old 01-03-2008, 12:47 AM   #1
MN80Vette
CF Senior Member
Thread Starter
 
MN80Vette's Avatar
 
Member Since: Sep 2006
Location: Columbus MN
Posts: 1,901
Thanked 6 Times in 5 Posts
Default What weight oil for a GM 350 HO crate?

There have been lots of threads about oil (dino vs. synthetic, high zinc vs. low zinc, etc.), but I didn't notice any experience or opinions for GM Performance crate engines, specifically for the 350/330 HO.

I have less than 12K miles on my 350 HO. I live in Minnesota, so high temps >90 are not a big concern. My temp guage rarely goes above 200 degrees. Heat is not a problem. I don't have catalytic converters (no emissions testing in MN), so zinc fowling up the cats is not an issue. I don't drive my '80 real hard, but I do like to leave my mark on an isolated strip of straight road near our house and I occasionally like the sound of full length headers, true dual pipes, and high flow mufflers at 3000-4000 rpm.

So, what oil do you recommend? I have been using Mobil 10w30 or 10w40 because I thought it offered the best lubrication. I use Rotella in our mint-condition 60K-mile '93 Turbo Cummins Dodge pickup (2 gallons per oil change!) but I never thought about using it in my 350 HO.

I'm open to suggestions. What do you recommend?

BTW, I only use WIX filters.
MN80Vette is offline   Reply With Quote
Old 01-03-2008, 01:26 AM   #2
rihwoods
CF Senior Member
 
rihwoods's Avatar
 
Member Since: Feb 2005
Posts: 16,098
Thanks: 0
Thanked 2 Times in 2 Posts
Default

Rotella ok...as long as you are feeding it zinc for the flat tappet bump stick...(cam)..not sure about % zinc in the Mobil though....you might check their ZDDP additive package..

Last edited by rihwoods; 01-03-2008 at 01:32 AM.
rihwoods is offline   Reply With Quote
Old 01-03-2008, 07:37 AM   #3
paul 74
Ontario, Canada
Support Corvetteforum!
 
paul 74's Avatar
 
Member Since: Aug 1999
Posts: 30,561
Thanks: 0
Thanked 36 Times in 35 Posts
Default

It's pretty hard to go wrong with 10W-30. Being sensitive to the zinc/phosphorous issue, I use this CH/SI oil in my 1967.


Last edited by paul 74; 01-03-2008 at 07:40 AM.
paul 74 is offline   Reply With Quote
Old 01-03-2008, 09:55 AM   #4
Jims79
CF Senior Member
 
Jims79's Avatar
 
Member Since: Dec 2004
Location: Jersey Shore Exit 98
Posts: 4,876
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Quote:
Originally Posted by rihwoods View Post
Rotella ok...as long as you are feeding it zinc for the flat tappet bump stick...(cam)..not sure about % zinc in the Mobil though....you might check their ZDDP additive package..
I don't think there is any zinc in the mobil but the shell rotella has it. I run 10w-30 val racing oil w/zinc. only have less then 1000 miles on the new motor. Next spring when I wake the beast up I'll switch to 10w40 or 20w-50 racing oil or rotella-T. Search the old threads there is a good one concerning the best oil to use.
Jims79 is offline   Reply With Quote
Old 01-03-2008, 10:21 AM   #5
pws69
CF Senior Member
 
pws69's Avatar
 
Member Since: Nov 2001
Location: Eastern US XX
Posts: 2,569
Thanked 3 Times in 3 Posts
Default

Quote:
Originally Posted by MN80Vette View Post
There have been lots of threads about oil (dino vs. synthetic, high zinc vs. low zinc, etc.), but I didn't notice any experience or opinions for GM Performance crate engines, specifically for the 350/330 HO.

I have less than 12K miles on my 350 HO. I live in Minnesota, so high temps >90 are not a big concern. My temp guage rarely goes above 200 degrees. Heat is not a problem. I don't have catalytic converters (no emissions testing in MN), so zinc fowling up the cats is not an issue. I don't drive my '80 real hard, but I do like to leave my mark on an isolated strip of straight road near our house and I occasionally like the sound of full length headers, true dual pipes, and high flow mufflers at 3000-4000 rpm.

So, what oil do you recommend? I have been using Mobil 10w30 or 10w40 because I thought it offered the best lubrication. I use Rotella in our mint-condition 60K-mile '93 Turbo Cummins Dodge pickup (2 gallons per oil change!) but I never thought about using it in my 350 HO.

I'm open to suggestions. What do you recommend?

BTW, I only use WIX filters.
Mobil 1
pws69 is offline   Reply With Quote
Old 01-03-2008, 10:33 AM   #6
Roughrider
CF Senior Member
 
Roughrider's Avatar
 
Member Since: Mar 2007
Location: Frederick Maryland
Posts: 2,093
Thanks: 0
Thanked 3 Times in 3 Posts
Default

I have a 350HO in one of my cars with only about 500 miles on it. It has 10W30 oil in it with GM EOS added. GM took the EOS off the market for awhile but has released a reformulated version now...supposedly with less ZDDP in it than before.

The manager at my local Chevy dealer said EOS is nothing more than GM's version of STP, but I don't know if that's accurate. Either way, STP does have ZDDP in it. The STP red bottle has more ZDDP than the blue bottle, but either should be sufficient of you can't find Shell Rotella or an equivalent.
Roughrider is offline   Reply With Quote
Old 01-03-2008, 10:48 AM   #7
mpett1
CF Senior Member
 
mpett1's Avatar
 
Member Since: Feb 2005
Location: Harleysville pa
Posts: 571
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Does that motor have a flat tappet cam in it? If so I use VR1 valvoleen.
mpett1 is offline   Reply With Quote
Old 01-03-2008, 07:25 PM   #8
blunblk68
CF Senior Member
 
blunblk68's Avatar
 
Member Since: May 2007
Location: LaMoille Illinois
Posts: 1,160
Thanked 10 Times in 6 Posts
Default

i use 10w-40 standard valvoline in my 383 (10 yrs now) my 350 in the camaro and in the 327 in the vette.
i have heard that the heavy(thick) racing oils wont circulate as fast on start ups etc.. giving time for cylinder scratching etc..
unless your running it in the 1/4 mile alot i would use a good 10w-30 for breakin and winters up north and 10w-40 in the summer. jmho
blunblk68 is offline   Reply With Quote
Old 01-03-2008, 07:45 PM   #9
RunningMan373
CF Senior Member
 
RunningMan373's Avatar
 
Member Since: May 2007
Location: Bay Area CA
Posts: 3,246
Thanks: 0
Thanked 0 Times in 0 Posts
Default

At your point- Royal Purple 10w40. I've got an pretty extensive oil test PDF if you want it. send your e-mail. C.
RunningMan373 is offline   Reply With Quote
Old 01-03-2008, 08:06 PM   #10
my mach 5
CF Senior Member
 
my mach 5's Avatar
 
Member Since: Feb 2006
Location: South Elgin IL
Posts: 324
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Quote:
Originally Posted by mpett1 View Post
Does that motor have a flat tappet cam in it? If so I use VR1 valvoleen.
The GM 350 HO DOES have flat tappet cam. The ZZ4 has a roller.
my mach 5 is offline   Reply With Quote
Old 01-03-2008, 08:35 PM   #11
MN80Vette
CF Senior Member
Thread Starter
 
MN80Vette's Avatar
 
Member Since: Sep 2006
Location: Columbus MN
Posts: 1,901
Thanked 6 Times in 5 Posts
Default

Quote:
Originally Posted by RunningMan373 View Post
At your point- Royal Purple 10w40. I've got an pretty extensive oil test PDF if you want it. send your e-mail. C.
PM sent. Thanks!
MN80Vette is offline   Reply With Quote
Old 01-04-2008, 10:22 AM   #12
mpett1
CF Senior Member
 
mpett1's Avatar
 
Member Since: Feb 2005
Location: Harleysville pa
Posts: 571
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Quote:
Originally Posted by RunningMan373 View Post
At your point- Royal Purple 10w40. I've got an pretty extensive oil test PDF if you want it. send your e-mail. C.
Hey can you shoot me that PDF? Mpett1@netzero.com

Thanks
mpett1 is offline   Reply With Quote
Old 01-04-2008, 12:47 PM   #13
7T1vette
CF Senior Member
 
7T1vette's Avatar
 
Member Since: Jan 2006
Location: Crossville TN
Posts: 25,919
Thanked 217 Times in 199 Posts
Default

The only sensible response is to use a good quality synthetic oil...especially in Minnesota. Temp changes will "age" regular oil pretty quickly [oxidation]. Synthetics last longer and keep their viscosity better over time. If your engine has leak 'problems', they could be worse if you go to synthetic; if your engine is sealed well, there should be no problem.
7T1vette is offline   Reply With Quote
Old 01-06-2008, 08:15 AM   #14
MN80Vette
CF Senior Member
Thread Starter
 
MN80Vette's Avatar
 
Member Since: Sep 2006
Location: Columbus MN
Posts: 1,901
Thanked 6 Times in 5 Posts
Default

Quote:
Originally Posted by 7T1vette View Post
The only sensible response is to use a good quality synthetic oil...especially in Minnesota. Temp changes will "age" regular oil pretty quickly [oxidation]. Synthetics last longer and keep their viscosity better over time. If your engine has leak 'problems', they could be worse if you go to synthetic; if your engine is sealed well, there should be no problem.
The stability of synthetics is the main reason I use Mobil 1, but they have to meet ILSAC GF-4 phosphorus (ZDDP) requirements. Another post in the Tech/Perf section on flat tappet cams contained a link that lead to a table that shows the level of ZDDP in each of their oils:

http://www.mobiloil.com/USA-English/...duct_Guide.pdf

It looks like I can have Mobil 1 and ZDDP if I just switch to a different Mobil 1 oil.
MN80Vette is offline   Reply With Quote
Old 01-06-2008, 09:09 AM   #15
3JsVette
CF Senior Member
 
3JsVette's Avatar
 
Member Since: Jan 2007
Location: NYC NY
Posts: 6,467
Thanked 91 Times in 88 Posts
Default Mobil 1

I have a ZZ3 in my Nomad and use 10W30 Mobil 1. When I switched I saw a very slight increase in gas milage and no consumption between oil changes. The motor only has about 12K miles on it so I change the oil by time not milage. There may be better choises out there but I don't think you can go wrong with the Mobil 1.
3JsVette is online now   Reply With Quote
Old 01-06-2008, 09:44 AM   #16
7T1vette
CF Senior Member
 
7T1vette's Avatar
 
Member Since: Jan 2006
Location: Crossville TN
Posts: 25,919
Thanked 217 Times in 199 Posts
Default

Changing synthetics by "time" is fine, if you don't mind the expense...but it kind of defeats the purpose of the synthetic oil. It doesn't oxidize like organic oil, so changing it based on time is really unnecssary. Even if you choose that approach, synthetic is still the best choice.
7T1vette is offline   Reply With Quote
Go Back   Corvette Forum >
Reload this Page
  • What weight oil for a GM 350 HO crate?
  •  
     
    Reply

    Related Topics
    Thread Thread Starter Forum Replies Last Post
    Quaker State’s New “Defy” Motor Oil – Lab Test and Wear Test Data 540 RAT C3 Tech/Performance 20 04-27-2016 06:57 AM
    Test Data on 9 Different Break-In Oils 540 RAT C6 Tech/Performance 7 04-23-2015 09:44 AM
    Nice oil write on C3 forum.... thecatmac C4 General Discussion 5 03-17-2013 12:15 PM
    Fuel injection for Vortec/350 HO crate? MN80Vette C3 Tech/Performance 7 03-25-2008 07:31 AM
    GM 350 HO vs. ZZ383 bams12 C3 Tech/Performance 17 05-24-2006 10:40 PM


    Tags
    350, 35o, capacity, change, chev, corvette, crate, gm, ho, oil, performance, put, rebuilt, roller, syntheic, weight

    Thread Tools Search this Thread
    Search this Thread:

    Click for Advanced Search

    Posting Rules
    You may not post new threads
    You may not post replies
    You may not post attachments
    You may not edit your posts

    BB code is On
    Smilies are On
    [IMG] code is On
    HTML code is Off
    Trackbacks are Off
    Pingbacks are Off
    Refbacks are Off

    Forum Jump


    All times are GMT -4. The time now is 10:14 AM.