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#1 |
Registered User
Join Date: Nov 2001
Location: Albertville, Alabama USA
Posts: 299
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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?
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1977 Short Stepside, black, 350/350. Located in Albertville, Alabama. |
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#2 |
Registered User
Join Date: Feb 2000
Location: Brandon, SD, USA
Posts: 1,292
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10w 40
is what i use
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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 |
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#3 |
72 Cheyenne
Join Date: Oct 2001
Location: San Diego
Posts: 2,086
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I have about 1200 miles on my motor and I'm using 10/40
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#4 |
I need another Barley Pop
Join Date: Feb 2001
Location: Grants Pass, OR
Posts: 1,629
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20w50 Synthetic is all I run
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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" ![]() |
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#5 |
Senior Member
![]() Join Date: Mar 2000
Location: Saskatoon,SK,Canada
Posts: 2,476
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5w-50 synthetic
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Saskatoon, Saskatchewan Canada |
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#6 |
No, U Da Man!
Join Date: Mar 2001
Location: Southaven, MS
Posts: 284
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10W30
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(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 |
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#7 |
Registered User
Join Date: Mar 2002
Location: elk grove , ca ,usa
Posts: 14
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10w40
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1972 C/10 4x4 |
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#8 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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15/40 most the time.
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#9 |
Transcendental Trucker
Join Date: Dec 2001
Location: Rockaway Beach, OR
Posts: 374
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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.
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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! |
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#10 |
Recovering Truck Driver
Join Date: Mar 2002
Location: Orleans, NE USA
Posts: 1,883
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i use 15w40
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67 K-20 350, SM465, Eaton rear, 4.56 no spin option 00 Dodge 2500 4x4, 24V cummins, 5 speed Chad South Central Nebraska |
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#11 |
"See the U.S.A....."
Join Date: Apr 2002
Location: Richmond TX.
Posts: 269
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20W 50
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1970 short bed fleetside 1949 all origional chevy 3600 1974 camaro Richmond , Texas(just S.W.of Houston) |
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#12 |
14.1 @ 96MPH
Join Date: Jul 2001
Location: Mesa, AZ
Posts: 2,811
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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.
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Project1970 - LS1 Swap Complete! ![]() |
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#13 |
Registered User
Join Date: Feb 2000
Location: Center City, MN, USA
Posts: 3,254
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10w30 Summer and winter.
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'70 cab, '71 chassis, 383, TH350, NP205. '71 Malibu convertible '72 Malibu hard top Center City, MN |
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#14 |
Wiseass secured himself a BAN
Join Date: Nov 2000
Location: MOON!!!
Posts: 2,282
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Castrol Sytec blend 10w 40
Ben |
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#15 |
Led Sled! Discs R 4 ME!
![]() Join Date: Jan 2001
Location: Toms River, NJ, USA (Transplanted Hoosier)
Posts: 7,327
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10W40 in the summer
10W30 in the Fall, winter and spring |
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#16 |
Broke
Join Date: Aug 2001
Location: West Plains,MO
Posts: 385
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10w30
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72CheyenneSuper1ton4x4BigBlock |
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#17 |
Livin' it up.
![]() Join Date: Nov 2001
Location: Richland, MI
Posts: 2,212
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10w30 all year, but i dont exaclty live in a unstable climate
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-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. ![]() |
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#18 |
Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,721
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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.
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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 |
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#19 |
Registered User
Join Date: Jan 2002
Location: Renton, WA
Posts: 171
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20 50 kendall
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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. |
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#20 |
Registered User
Join Date: Aug 2001
Location: Midwest City, OK
Posts: 289
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10w 30
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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 |
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#21 |
Gasser
Join Date: May 2000
Location: Thomasville,NC USA
Posts: 456
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Straight 30 Valvoline # 159 in the 70. The LT-1 in the 68 will get Mobil 1, 10w30.
Stepside
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:thud 70 sstep tubbed, Muncie, double hump, snowflake, |
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#22 |
Registered User
Join Date: Oct 2001
Location: Ky
Posts: 255
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5-30 per GMC in the new Crate 350.
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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!!!!!!!!! |
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#23 |
now thats a true COON DOG
![]() Join Date: Nov 2000
Location: Franconia, NH
Posts: 1,977
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I'm running Mobile 1 10w30 in the burb. Allways have run 10w30. Is thinker oil any better?.......like 20w50
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current project 67 ![]() 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) ![]() 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!) |
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#24 |
Senior Member
![]() Join Date: Jan 2000
Location: Arlington, VA
Posts: 398
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My high milage 250 uses a steady diet of 20-50. 15-40 just escapes from the crankcase too fast.
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#25 |
Registered User
Join Date: Jun 2000
Location: LEE'S SUMMIT, MO. USA
Posts: 246
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10w40
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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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