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#1579791 - 08/27/09 02:05 AM oil weight opinions wanted
oil_dude Offline


Registered: 06/13/07
Posts: 11
Loc: az
i have a 68 gto factory a/c car.i decided to rebuild original 400 with a crank kit(basically a 455).engine has about 1500 miles on it.i have delo 15/40w in it now.after doing some reading i was thinking of going to 30w vr1,etc?i live in phx,az so the temps are 100 plus now til mid sept.car without a/c on runs around 190/200 depending how long i sit at a light.with the a/c on engine sees 220 at long stoplights.will 30 weight be able to handle the heat of the engine and enviroment i live in?it's my weekend cruiser and when it gets cooler it will be going to the track.i flog it every chance i get when i take it out cause it's just a torque monster and it doesn't take much to beak the tires loose.it has a flat tappet hydralic cam.no oil cooler.high volume/high pressure oil pump.should i try a good 30w or stick with good ol' 15/40? if i was going to use 30w i was going to use a straight weight.i know there are two different camps on thick oil versus thinner weight oil.right know i'm on the fence on this one.i value your input and thoughts on wether i should try 30w or not.
_________________________
98 isuzu hombre 2.2L,265k vavoline max life 10/40w
68 gto,rotella 15/40w,03 buell xb9 24K,mobil-1

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#1579792 - 08/27/09 02:14 AM Re: oil weight opinions wanted [Re: oil_dude]
JustinH Offline


Registered: 04/17/04
Posts: 4017
Loc: Texas
I would stick with the Delo or another heavy duty oil like it.

Mobil Delvac, Delo, etc..
_________________________
'10 Toyota Rav4 Sport
'08 Toyota Matrix

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#1579815 - 08/27/09 04:02 AM Re: oil weight opinions wanted [Re: JustinH]
Colt45ws Offline


Registered: 08/15/06
Posts: 8453
Loc: Central Washington
15W40 is what I would use.
_________________________
-Colton
2002 Ford Crown Vic PI, 180k "Highwayman"
Ex-Kootenai County, ID Unit #42
Maxlife 5W20
Lubegard Bio/Tech oil treatment
Ultra XG2

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#1579904 - 08/27/09 08:36 AM Re: oil weight opinions wanted [Re: Colt45ws]
addyguy Offline


Registered: 09/08/05
Posts: 13844
Loc: Canada
Nice car. Stick with the 15W-40 HDEO.
_________________________
2003 Mazda Tribute LX V-6, 196,850 miles...DEAD.
MM F1 5W-20 conventional + Bardahl + top-offs.
MM MPH2 filter.

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#1579916 - 08/27/09 08:46 AM Re: oil weight opinions wanted [Re: addyguy]
ARCOgraphite Offline


Registered: 05/17/09
Posts: 9800
Loc: N.H, U.S.A.
What does your engine builder recommend - he knows your bearing clearances and pump flow and bypass settings. You can try a 10w-30 fleet oil, rotella Cj4. Straight 30wt are usually just 10w-30 without winter pour point depressors. I would NOT run a diesel oil that has Mg additives in it, you might get metal loauding in the CC and valve heads and start to get ping then knock.
_________________________
2014 Nissan Rogue S CVT, OC#4 13740mi-Castrol Magnetec 5W30+Nissan 15208-9E01A Filter
2015 Forester 6MT 5Door, OC#4 24596mi-PP 0W20+Subaru Filter

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#1579921 - 08/27/09 08:49 AM Re: oil weight opinions wanted [Re: ARCOgraphite]
ARCOgraphite Offline


Registered: 05/17/09
Posts: 9800
Loc: N.H, U.S.A.
What is your idle oil pressure at high temps now? What is your valve spring seat and open pressure?
_________________________
2014 Nissan Rogue S CVT, OC#4 13740mi-Castrol Magnetec 5W30+Nissan 15208-9E01A Filter
2015 Forester 6MT 5Door, OC#4 24596mi-PP 0W20+Subaru Filter

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#1579990 - 08/27/09 10:02 AM Re: oil weight opinions wanted [Re: ARCOgraphite]
Steve S Offline


Registered: 01/20/03
Posts: 18449
Loc: East of IGO
You could use a 30 HDEO but I would use a 15w40 HDEO. I am presently installing a rebuilt similar to your engine with factory clearances and trans on a 67 GTO for a freind . I suggested he run a 15w40 HDEO in his new engine. It is the best oil for the money you can get.
_________________________
Why do people post I want the best for my car,,, When there isn't anything that is the best on the car to begin with.

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#1580435 - 08/27/09 06:27 PM Re: oil weight opinions wanted [Re: Steve S]
oil_dude Offline


Registered: 06/13/07
Posts: 11
Loc: az
my oil pressure at idle is 25psi hot(190/200)alittle lower when
hovering around 220.i have a melling RAIV/SD high volume/pressure pump.i'd have to call my buddy about the spring pressure's on the cam.it's a flat tappet hyd,cam 507/530.i'll have to get back to you with the rod and main clearances.the best i got it run so far since the new rebuild is 13.20 @ 109 mph with a really bad sixty foot time.but then came the heat of summer so,i'll take it to the track when it gets cooler to dial it in.thanks for your replies. also another member suggested not using hdeo with mg additive,whats mg additive and how do i tell what hdeo has it or not?


Edited by oil_dude (08/27/09 06:31 PM)
_________________________
98 isuzu hombre 2.2L,265k vavoline max life 10/40w
68 gto,rotella 15/40w,03 buell xb9 24K,mobil-1

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#1580680 - 08/27/09 09:18 PM Re: oil weight opinions wanted [Re: oil_dude]
Steve S Offline


Registered: 01/20/03
Posts: 18449
Loc: East of IGO
IMO a diesel oil is different from a HDEO oil. Any HDEO oil like Delo 400 or Rotella or Delvac 1300 and the like will work well.
_________________________
Why do people post I want the best for my car,,, When there isn't anything that is the best on the car to begin with.

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#1580914 - 08/28/09 04:48 AM Re: oil weight opinions wanted [Re: Steve S]
Rob_Roy Offline


Registered: 10/26/08
Posts: 897
Loc: Northern, NY
Stick with the 15w40.
_________________________
2015 Subaru Legacy 3.6
2014 Subaru Outback 2.5
1999 Ford F350, V10 workhorse

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#1581005 - 08/28/09 08:23 AM Re: oil weight opinions wanted [Re: Rob_Roy]
daman Offline


Registered: 09/23/06
Posts: 10894
Loc: Bad Axe, MI
You should also consider M1 TDT or shell RTS 5w40 synthetic to give you an edge with that extream heat,both great oil's as well.
_________________________
"Always"....Mobil 1

Current fill: AFE 0w30

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#1581235 - 08/28/09 12:24 PM Re: oil weight opinions wanted [Re: daman]
addyguy Offline


Registered: 09/08/05
Posts: 13844
Loc: Canada
13.20 in a HEAVY 1968 GTO with a new rebuild is darn good!
_________________________
2003 Mazda Tribute LX V-6, 196,850 miles...DEAD.
MM F1 5W-20 conventional + Bardahl + top-offs.
MM MPH2 filter.

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#1581333 - 08/28/09 02:16 PM Re: oil weight opinions wanted [Re: addyguy]
SteveSRT8 Offline


Registered: 10/10/08
Posts: 17371
Loc: Sunny Florida
Nice ET, those are hard to launch well.

The oil you're on may be a tad thick if the engine is clearanced tight, but only your builder can answer that. I can't understand the need for a HV/HP pump on a properly built motor, but each place has their own reasoning.

The 15w/40 is a great all around oil.
_________________________
"In a democracy, dissent is an act of faith."
J. William Fulbright
Best ET-12.79 @ 111 mph
4340 pounds, Street tires
Just like we go to Publix

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#1581956 - 08/29/09 03:12 AM Re: oil weight opinions wanted [Re: SteveSRT8]
oil_dude Offline


Registered: 06/13/07
Posts: 11
Loc: az
my engine is not exactly stock.i have crank kit eagle crank and rods,je pistons,edelbrock perf rpm heads,si valves,comp springs/retainers,10 degree locks,ultradyne/bullet cam,perf rpm intake,RA IV/SD exhaust manifolds,hei with msd 6al box,3.08 gears,2800 stall conv.turbo 400,proform 850 carb.

i agree about the oil pump.in hindsight i wish i would have changed out the spring and put the sixty pound bypas spring in.
old mindsets and habits are sometimes hard to break.

the tolerances are right in the middle of factory clearances because i told him i may through a small nitrous system on it in the future.
_________________________
98 isuzu hombre 2.2L,265k vavoline max life 10/40w
68 gto,rotella 15/40w,03 buell xb9 24K,mobil-1

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#1582644 - 08/29/09 07:35 PM Re: oil weight opinions wanted [Re: oil_dude]
fito Offline


Registered: 12/04/08
Posts: 134
Loc: Wi
You are fine with the 15W40.

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