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Old 06-03-2002, 10:09 PM   #1
MIKE'67
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Question 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?
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Old 06-03-2002, 10:25 PM   #2
Benrs86
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10w 40

is what i use
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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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Old 06-03-2002, 10:32 PM   #3
dion
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I have about 1200 miles on my motor and I'm using 10/40
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Old 06-03-2002, 10:34 PM   #4
Pont
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20w50 Synthetic is all I run
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Old 06-03-2002, 10:35 PM   #5
StingRay
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5w-50 synthetic
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Old 06-03-2002, 10:41 PM   #6
oleblue72
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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
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1967 Olds Vista Cruiser 330-320HP
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Old 06-03-2002, 11:02 PM   #7
old yeller
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10w40
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Old 06-03-2002, 11:07 PM   #8
Longhorn Man
its all about the +6 inches
 
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15/40 most the time.
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Old 06-04-2002, 01:20 AM   #9
Patrick Sullivan
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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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1972 Chevy Cheyenne C-20
1998 Dodge Dakota 4x4

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And drink a health whate'er befalls...
Then gently rise and softly call
Goodnight and joy be to you all!
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Old 06-04-2002, 01:25 AM   #10
O'l Buck
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i use 15w40
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Old 06-04-2002, 01:47 AM   #11
70shortnphat
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20W 50
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1970 short bed fleetside
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Old 06-04-2002, 03:12 AM   #12
Project1970
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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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Old 06-04-2002, 07:29 AM   #13
mrein3
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10w30 Summer and winter.
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Old 06-04-2002, 07:53 AM   #14
67Fleetsidedream
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Castrol Sytec blend 10w 40
Ben
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Old 06-04-2002, 09:16 AM   #15
DennyB
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10W40 in the summer
10W30 in the Fall, winter and spring
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Old 06-04-2002, 09:18 AM   #16
Bram
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10w30
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Old 06-04-2002, 11:21 AM   #17
Big69C20 Toy
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10w30 all year, but i dont exaclty live in a unstable climate
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Sold the 69 C20. It's off to a better home with more love!
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Old 06-04-2002, 02:38 PM   #18
Mike C
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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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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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Old 06-04-2002, 05:07 PM   #19
devinfife
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20 50 kendall
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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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Old 06-04-2002, 05:11 PM   #20
Larry68GMC
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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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Old 06-04-2002, 05:38 PM   #21
Stepside
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Straight 30 Valvoline # 159 in the 70. The LT-1 in the 68 will get Mobil 1, 10w30.
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Old 06-04-2002, 07:14 PM   #22
hwedding56
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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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Old 06-04-2002, 07:42 PM   #23
71402BB
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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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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!)
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Old 06-04-2002, 09:39 PM   #24
Willy Prost
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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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Old 06-04-2002, 09:56 PM   #25
CHUCKER
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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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