Anybody have a factory manual for a NP203 equipped truck? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

zac · 11-10-2010, 11:04 PM

What kind of oil does it say to put in the NP203? I want to know what the owner's or shop manual says. I believe it is 10W-30 or 10W-40. Thanks.

GM72K10 · 11-11-2010, 07:01 AM

Should be 30 wt non detergent, correct me if I'm wrong.

zac · 11-11-2010, 12:00 PM

I've seen some things that say New Process intended it to have straight 30 weight non-detergent, like you said, but I have no idea where to find the New Process specs. The cheesy Haynes manual I bought for my truck says 10w-30, but I don't necessarily trust it. I'm curious what GM, Ford and Dodge said to put in. And I assume some of those trucks were in the military. I wonder what their manuals said.

Adams74Chevy · 11-11-2010, 03:09 PM

Quote:

Originally Posted by GM72K10

Should be 30 wt non detergent, correct me if I'm wrong.

That's what I've understood it should be as well.

GM72K10 · 11-11-2010, 06:48 PM

Quote:

Originally Posted by zac

I've seen some things that say New Process intended it to have straight 30 weight non-detergent, like you said, but I have no idea where to find the New Process specs. The cheesy Haynes manual I bought for my truck says 10w-30, but I don't necessarily trust it. I'm curious what GM, Ford and Dodge said to put in. And I assume some of those trucks were in the military. I wonder what their manuals said.

"military" cucvs have either NP205s or NP208s, NO NP203s

77gmcjoe · 11-11-2010, 07:35 PM

Direct from my '77 owner's manual and in the General's own words:

Sorry for the crappy cell phone pic.

*78 Chevyrado* · 11-11-2010, 07:40 PM

I looked in my 78 shop manual and all it says about 203 oil is to use "ENGINE OIL". thats the exact words.

motornut · 11-11-2010, 11:05 PM

was told that too and that the full time,with a part time kit has to be run quite a bit more then usual as the front isn't oiled if not engaged?.....still new to me and i don't mind usin it

zac · 11-11-2010, 11:27 PM

Thanks for the input, guys. Still not sure which way I'm going to go. The 203 is in my '79 K20, which is all the sudden getting alot more use than usual since the engine in my '70 K10 burb spun a bearing or something. I'd forgotten how unnerving it can be to drive a full-time truck at 70 mph. This truck usually just sits except when something needs to be hauled or pulled.

11-10-2010, 11:04 PM	#1
zac Registered User Join Date: Jul 2008 Location: louisville, ky Posts: 502	Anybody have a factory manual for a NP203 equipped truck? What kind of oil does it say to put in the NP203? I want to know what the owner's or shop manual says. I believe it is 10W-30 or 10W-40. Thanks.

11-11-2010, 07:01 AM	#2
GM72K10 Next! Join Date: Jan 2003 Location: Eastern Pa. Posts: 2,483	Re: Anybody have a factory manual for a NP203 equipped truck? Should be 30 wt non detergent, correct me if I'm wrong. __________________ 86 K30 CUCV M1028A1 86 K30 CUCV M1028a2 dually 86 K30 C&C 6.2 4:56s, 4M, 11,000 gvw, ex fire truck, now lowboy dump More square bodies and CUCVs than I care to admit to 2020 Silverado K3500HD Work truck

11-11-2010, 12:00 PM	#3
zac Registered User Join Date: Jul 2008 Location: louisville, ky Posts: 502	Re: Anybody have a factory manual for a NP203 equipped truck? I've seen some things that say New Process intended it to have straight 30 weight non-detergent, like you said, but I have no idea where to find the New Process specs. The cheesy Haynes manual I bought for my truck says 10w-30, but I don't necessarily trust it. I'm curious what GM, Ford and Dodge said to put in. And I assume some of those trucks were in the military. I wonder what their manuals said.

11-11-2010, 07:35 PM	#6
77gmcjoe What do we get for $10? Join Date: Oct 2004 Location: Beardstown, Illinois Posts: 340	Re: Anybody have a factory manual for a NP203 equipped truck? Direct from my '77 owner's manual and in the General's own words: Sorry for the crappy cell phone pic. __________________ 1977 GMC K25 400/400/205 1989 Chevy Suburban R1500 350/700R4 (work beater) 1994 Chevy K3500 dually 454/4L80 1996 Corvette LT4 350/ZF 6 speed 2000 Bonneville SSEI Supercharged 3.8 Liter V6 1966 Chevelle 2 door sedan (Needs major repair )

11-11-2010, 07:40 PM	#7
78 Chevyrado Account Suspended Join Date: Dec 2007 Location: Unnapreciative, Trollville Posts: 2,079	Re: Anybody have a factory manual for a NP203 equipped truck? I looked in my 78 shop manual and all it says about 203 oil is to use "ENGINE OIL". thats the exact words.

11-11-2010, 11:05 PM	#8
motornut 78K & 79C Jimmys Join Date: Nov 2009 Location: Ottawa Ont CANADA Posts: 7,901	Re: Anybody have a factory manual for a NP203 equipped truck? was told that too and that the full time,with a part time kit has to be run quite a bit more then usual as the front isn't oiled if not engaged?.....still new to me and i don't mind usin it __________________ John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350

11-11-2010, 11:27 PM	#9
zac Registered User Join Date: Jul 2008 Location: louisville, ky Posts: 502	Re: Anybody have a factory manual for a NP203 equipped truck? Thanks for the input, guys. Still not sure which way I'm going to go. The 203 is in my '79 K20, which is all the sudden getting alot more use than usual since the engine in my '70 K10 burb spun a bearing or something. I'd forgotten how unnerving it can be to drive a full-time truck at 70 mph. This truck usually just sits except when something needs to be hauled or pulled.



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