What weight oil do you use? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

MIKE'67 · 06-03-2002, 10:09 PM

What weight oil do you use. I had a recent oil change and they put in 10W30. It's been in the mid 90's for several days now and my oil pressure has gone down. I'm thinking of 20W50. The engine only has 2500 miles and the oil pump is new. The only thing I can think of is viscocity break down. Any help?

Benrs86 · 06-03-2002, 10:25 PM

is what i use

dion · 06-03-2002, 10:32 PM

I have about 1200 miles on my motor and I'm using 10/40

Pont · 06-03-2002, 10:34 PM

20w50 Synthetic is all I run

**StingRay** · 06-03-2002, 10:35 PM

5w-50 synthetic

oleblue72 · 06-03-2002, 10:41 PM

10W30

old yeller · 06-03-2002, 11:02 PM

10w40

Longhorn Man · 06-03-2002, 11:07 PM

15/40 most the time.

Patrick Sullivan · 06-04-2002, 01:20 AM

All I had last time I changed it was 5W30, so that's what's in there. No knocking or anything.

Going to 10W30 or 40 next time, though.

O'l Buck · 06-04-2002, 01:25 AM

i use 15w40

70shortnphat · 06-04-2002, 01:47 AM

20W 50

Project1970 · 06-04-2002, 03:12 AM

20w50 dino oil. I'd run a thinner grade or synthetic (since heavier dino oil takes more power to slosh around, that kinda thing) but it leaks/burns enough as-is.

When I get a new engine I'll start with 10w30 synth and go from there. The Vortec in our '97 Suburban is perfectly happy year-round in AZ with 10w30, but the LT1 in the '94 Z28 never builds enough pressure with it, so it gets 15w50, as does the Benz.

mrein3 · 06-04-2002, 07:29 AM

10w30 Summer and winter.

*67Fleetsidedream* · 06-04-2002, 07:53 AM

Castrol Sytec blend 10w 40
Ben

DennyB · 06-04-2002, 09:16 AM

10W40 in the summer
10W30 in the Fall, winter and spring

Bram · 06-04-2002, 09:18 AM

10w30

Big69C20 Toy · 06-04-2002, 11:21 AM

10w30 all year, but i dont exaclty live in a unstable climate

Mike C · 06-04-2002, 02:38 PM

I ran 10 40 for years and years, but a recent discussion on oils with a petroleum engineer has changed my ways! He said that 10 40 was the first variable viscosity oil and that either 10 30 or 20 50 weights take less additives and manipulations to achieve than the 10 40 and as a result, they were better lubricants. Take it as you will, but I have switched to 10 30 in my cars and 20 50 in my trucks.

devinfife · 06-04-2002, 05:07 PM

20 50 kendall

Larry68GMC · 06-04-2002, 05:11 PM

10w 30

Stepside · 06-04-2002, 05:38 PM

Straight 30 Valvoline # 159 in the 70. The LT-1 in the 68 will get Mobil 1, 10w30.
Stepside

hwedding56 · 06-04-2002, 07:14 PM

5-30 per GMC in the new Crate 350.

71402BB · 06-04-2002, 07:42 PM

I'm running Mobile 1 10w30 in the burb. Allways have run 10w30. Is thinker oil any better?.......like 20w50

Willy Prost · 06-04-2002, 09:39 PM

My high milage 250 uses a steady diet of 20-50. 15-40 just escapes from the crankcase too fast.

CHUCKER · 06-04-2002, 09:56 PM

10w40

06-03-2002, 10:09 PM	#1
MIKE'67 Registered User Join Date: Nov 2001 Location: Albertville, Alabama USA Posts: 299	What weight oil do you use? What weight oil do you use. I had a recent oil change and they put in 10W30. It's been in the mid 90's for several days now and my oil pressure has gone down. I'm thinking of 20W50. The engine only has 2500 miles and the oil pump is new. The only thing I can think of is viscocity break down. Any help? __________________ 1977 Short Stepside, black, 350/350. Located in Albertville, Alabama.

06-03-2002, 10:25 PM	#2
Benrs86 Registered User Join Date: Feb 2000 Location: Brandon, SD, USA Posts: 1,292	10w 40 is what i use __________________ Brandon, SD 69 GMC 1/2 ton 2wd wide long bed with wood 3 on the tree 350 engine 4 bolt main rv cam AIM = Alphray04

06-03-2002, 10:32 PM	#3
dion 72 Cheyenne Join Date: Oct 2001 Location: San Diego Posts: 2,086	I have about 1200 miles on my motor and I'm using 10/40 __________________ Burnout Idle 1972Cheyenne 1966/67Stouts

06-03-2002, 10:34 PM	#4
Pont I need another Barley Pop Join Date: Feb 2001 Location: Grants Pass, OR Posts: 1,629	20w50 Synthetic is all I run __________________ 67 Short Fleet 4x4 04 Honda CRF450R 89 Toyota 4-Runner 34 Ford 2 door sedan - Long term project ---------------------------------------------- There is a very fine line between "hobby" and "mental illness"

06-03-2002, 10:35 PM	#5
StingRay Senior Member Join Date: Mar 2000 Location: Saskatoon,SK,Canada Posts: 2,476	5w-50 synthetic __________________ Saskatoon, Saskatchewan Canada

06-03-2002, 10:41 PM	#6
oleblue72 No, U Da Man! Join Date: Mar 2001 Location: Southaven, MS Posts: 284	10W30 __________________ (sold ole blue 1972) 1997 Dodge 1500 5.9L 1996 Saturn SL2 1.9L 2002 Mitsubishi Montero 3.0L 2005 Ford Escape 3.0L *1967 Olds Vista Cruiser 330-320HP*

06-03-2002, 11:02 PM	#7
old yeller Registered User Join Date: Mar 2002 Location: elk grove , ca ,usa Posts: 14	10w40 __________________ 1972 C/10 4x4

06-03-2002, 11:07 PM	#8
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	15/40 most the time.

06-04-2002, 01:20 AM	#9
Patrick Sullivan Transcendental Trucker Join Date: Dec 2001 Location: Rockaway Beach, OR Posts: 374	All I had last time I changed it was 5W30, so that's what's in there. No knocking or anything. Going to 10W30 or 40 next time, though. __________________ Patrick Sullivan \| sullivan@oregoncoast.com Rockaway Beach, Oregon 1972 Chevy Cheyenne C-20 1998 Dodge Dakota 4x4 So, fill to me the parting glass And drink a health whate'er befalls... Then gently rise and softly call Goodnight and joy be to you all!

06-04-2002, 01:25 AM	#10
O'l Buck Recovering Truck Driver Join Date: Mar 2002 Location: Orleans, NE USA Posts: 1,883	i use 15w40 __________________ 67 K-20 350, SM465, Eaton rear, 4.56 no spin option 00 Dodge 2500 4x4, 24V cummins, 5 speed Chad South Central Nebraska

06-04-2002, 01:47 AM	#11
70shortnphat "See the U.S.A....." Join Date: Apr 2002 Location: Richmond TX. Posts: 269	20W 50 __________________ 1970 short bed fleetside 1949 all origional chevy 3600 1974 camaro Richmond , Texas(just S.W.of Houston)

06-04-2002, 03:12 AM	#12
Project1970 14.1 @ 96MPH Join Date: Jul 2001 Location: Mesa, AZ Posts: 2,811	20w50 dino oil. I'd run a thinner grade or synthetic (since heavier dino oil takes more power to slosh around, that kinda thing) but it leaks/burns enough as-is. When I get a new engine I'll start with 10w30 synth and go from there. The Vortec in our '97 Suburban is perfectly happy year-round in AZ with 10w30, but the LT1 in the '94 Z28 never builds enough pressure with it, so it gets 15w50, as does the Benz. __________________ Project1970 - LS1 Swap Complete!

06-04-2002, 07:29 AM	#13
mrein3 Registered User Join Date: Feb 2000 Location: Center City, MN, USA Posts: 3,254	10w30 Summer and winter. __________________ '70 cab, '71 chassis, 383, TH350, NP205. '71 Malibu convertible '72 Malibu hard top Center City, MN

06-04-2002, 07:53 AM	#14
67Fleetsidedream Wiseass secured himself a BAN Join Date: Nov 2000 Location: MOON!!! Posts: 2,282	Castrol Sytec blend 10w 40 Ben

06-04-2002, 09:16 AM	#15
DennyB Led Sled! Discs R 4 ME! Join Date: Jan 2001 Location: Toms River, NJ, USA (Transplanted Hoosier) Posts: 7,327	10W40 in the summer 10W30 in the Fall, winter and spring __________________ "Never ride faster than your Angel can fly" I.M.O.M,W,J&C Patriot Guard Rider



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06-04-2002, 09:18 AM	#16
Bram Broke Join Date: Aug 2001 Location: West Plains,MO Posts: 385	10w30 __________________ 72CheyenneSuper1ton4x4BigBlock

06-04-2002, 11:21 AM	#17
Big69C20 Toy Livin' it up. Join Date: Nov 2001 Location: Richland, MI Posts: 2,212	10w30 all year, but i dont exaclty live in a unstable climate __________________ -Greg; Sold the 69 C20. It's off to a better home with more love! Now onto the 86 CUCV M1009; K5 blazer with 6.2L diesel, corp 10 bolt axles, Detroit locker in the rear, trutrac front, 3.73 gears, 35" tires.

06-04-2002, 02:38 PM	#18
Mike C Registered User Join Date: Dec 1999 Location: Austin, TX, USA Posts: 7,727	I ran 10 40 for years and years, but a recent discussion on oils with a petroleum engineer has changed my ways! He said that 10 40 was the first variable viscosity oil and that either 10 30 or 20 50 weights take less additives and manipulations to achieve than the 10 40 and as a result, they were better lubricants. Take it as you will, but I have switched to 10 30 in my cars and 20 50 in my trucks. __________________ 44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax

06-04-2002, 05:07 PM	#19
devinfife Registered User Join Date: Jan 2002 Location: Renton, WA Posts: 171	20 50 kendall __________________ FOUNDING MEMBER OF THE DRUM BRAKE CLUB 69 c-10. turquoise. 350 motor with 400 trans. long fleet. headers and dual flowmaster exhaust. K & N air cleaner, aluminum wheels and radials, stereo system and a bed liner. Manual drums and manual steering. Kickin it in Seattle, WA p.s. i love my longbed. must be a phallic thing.

06-04-2002, 05:11 PM	#20
Larry68GMC Registered User Join Date: Aug 2001 Location: Midwest City, OK Posts: 289	10w 30 __________________ 71 GMC LWB 350, Dart Pro1's 200/64cc,10.2:1 RPM AirGap, 224/234 @50 496/518 lift w/1.6 roller rockers, 2500 stall '05 Dodge 2500 Crew Cab 4x4, 4 inch lift and 35's CTD

06-04-2002, 05:38 PM	#21
Stepside Gasser Join Date: May 2000 Location: Thomasville,NC USA Posts: 456	Straight 30 Valvoline # 159 in the 70. The LT-1 in the 68 will get Mobil 1, 10w30. Stepside __________________ :thud 70 sstep tubbed, Muncie, double hump, snowflake,

06-04-2002, 07:14 PM	#22
hwedding56 Registered User Join Date: Oct 2001 Location: Ky Posts: 255	5-30 per GMC in the new Crate 350. __________________ 67-CST Factory PS PB AIR Buckets SWB FLEET 350-700r4 67-SWB Step Plain Jane 350-3 on the tree 68 1-1/2 ton Dump 12' rock Bed soon to have fast68's 292 installed 72 GMC 3/4 ton Crew Cab 402 BBL 400 tranny ( ok I bought it from Crews) Its one ugly long WB long bed 4 door truck!!!!!!!!!

06-04-2002, 07:42 PM	#23
71402BB now thats a true COON DOG Join Date: Nov 2000 Location: Franconia, NH Posts: 1,977	I'm running Mobile 1 10w30 in the burb. Allways have run 10w30. Is thinker oil any better?.......like 20w50 __________________ current project 67 402BB stout th350 3.08's with a locker. Plan on tubs 18.5's out back! (thanks Burnsman!) 71 SWB Stepside, was a 250, now is a 402 Big Block with 4 speed and 3.73's ( was crushed by a tree, bed sold, motor pulled) was my first truck!... oh well... 72 LWB 4x4 350 4-speed 3.08's posi wearing army olive drab green (SOLD!) 68 BURB 50TH LOOKALIKE work in progress, soon to have 250-I6 with a 3-speed on the tree 4.11's and posi ( currently sitting in back yard tarped awaiting time, $$$, and lots of love!) 67 1 TON- work truck 396 sm 420 4-speed, flat bed 4.57 gears "big red" (my first landscape truck, very rusty and crusty! but still gets the job done when needed!)

06-04-2002, 09:39 PM	#24
Willy Prost Senior Member Join Date: Jan 2000 Location: Arlington, VA Posts: 398	My high milage 250 uses a steady diet of 20-50. 15-40 just escapes from the crankcase too fast.

06-04-2002, 09:56 PM	#25
CHUCKER Registered User Join Date: Jun 2000 Location: LEE'S SUMMIT, MO. USA Posts: 246	10w40 __________________ 1972 K/20,4X4,454, dark olive 1937 General motors truck (big project) 2005 gmc envoy (wife's) 2003 2500hd ls, crewcab, 4x4, 360, hd 4spd automatic trans., Lee's summit, MO. S.E. of Kansas City,MO

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