Sae 90 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Guy58 · 12-06-2010, 05:03 PM

Happy Holidays to all,

Is SAE 90 the correct oil to use on my 1967 3 speed manual? I have a 250 Inline 6 with 3 on the tree.

guy58

69 longhorn · 12-06-2010, 08:53 PM

You could run that, or an 85/140....the old 3 spds ran a pretty heavy gear oil, & I see you are in the southwest. crazyAl

Guy58 · 12-07-2010, 10:06 AM

Thanks for the reply.

I am running Lucus 90 weight in my rear-end. Does Lucus make a 85/140 weight? Can I use Lucus oil, or is there a special name brand Chevy used for the transmision?

Guy

piecesparts · 12-07-2010, 10:53 AM

If all else fails, just put mineral oil in the tranny. Yep, I laughed too, but the dealer had us do that to a tranny on one of the County Highway Department trucks. It was done to solve a hard engagement problem with the tranny. It was still working when I left the shop for another job.

**Stocker** · 12-07-2010, 11:31 AM

If you're considering synthetic, take a look at Redline MTL. It's formulated especially for use in manual transmissions and is designed to improve synchro operation. I ran it in our old Miata.

heyjoe · 12-07-2010, 01:29 PM

AFAIK, Chevy used straight 90W GL-4 in these transmissions.
Straight 90W is no longer carried at any auto parts in my area for the last decade or more. The modern equivalent would be 85/90W, with GL-5 being most prevalent. You should run GL-4 in the transmission because of the brass syncros - something to do with sulphur content, I think.
I have been running GL-5 in mine with a recent tear down due to bearing failure at 250,000 miles - no syncro problems I could see other than normal wear and tear.

Guy58 · 12-07-2010, 06:41 PM

Thanks guys

I will use 85/90W with GL-5 if I can not find GL-4.

heyjoe

Could you pass the name brand and where to get it on to me?

guy58

heyjoe · 12-10-2010, 10:21 AM

Hey GUY58
No brand name in particular. Most the oil companies package this, it pretty much depends on what your local auto parts store happens to carry. Me, I get whatever's the lowest price.

12-06-2010, 05:03 PM	#1
Guy58 Registered User Join Date: Oct 2007 Location: Albuquerque, NM Posts: 158	Sae 90 Happy Holidays to all, Is SAE 90 the correct oil to use on my 1967 3 speed manual? I have a 250 Inline 6 with 3 on the tree. guy58

12-06-2010, 08:53 PM	#2
69 longhorn Registered User Join Date: Aug 2001 Location: rock island,il,usa Posts: 5,382	Re: Sae 90 You could run that, or an 85/140....the old 3 spds ran a pretty heavy gear oil, & I see you are in the southwest. crazyAl __________________ http://community.webshots.com/user/hotrodhorn

12-07-2010, 10:06 AM	#3
Guy58 Registered User Join Date: Oct 2007 Location: Albuquerque, NM Posts: 158	Re: Sae 90 Thanks for the reply. I am running Lucus 90 weight in my rear-end. Does Lucus make a 85/140 weight? Can I use Lucus oil, or is there a special name brand Chevy used for the transmision? Guy

12-07-2010, 10:53 AM	#4
piecesparts Parts and more parts Join Date: Nov 2003 Location: Lebo, Kansas (middle of nowhere Posts: 6,821	Re: Sae 90 If all else fails, just put mineral oil in the tranny. Yep, I laughed too, but the dealer had us do that to a tranny on one of the County Highway Department trucks. It was done to solve a hard engagement problem with the tranny. It was still working when I left the shop for another job. __________________ Frank

12-07-2010, 11:31 AM	#5
Stocker 20' Daredevil (Ret) Join Date: May 2003 Location: Jefferson State Posts: 13,728	Re: Sae 90 If you're considering synthetic, take a look at Redline MTL. It's formulated especially for use in manual transmissions and is designed to improve synchro operation. I ran it in our old Miata. __________________ - Mike - 1972 K20 LWB 350/350/205 RIP El Jay

12-07-2010, 01:29 PM	#6
heyjoe Registered User Join Date: Apr 2003 Location: New Orleans area Posts: 198	Re: Sae 90 AFAIK, Chevy used straight 90W GL-4 in these transmissions. Straight 90W is no longer carried at any auto parts in my area for the last decade or more. The modern equivalent would be 85/90W, with GL-5 being most prevalent. You should run GL-4 in the transmission because of the brass syncros - something to do with sulphur content, I think. I have been running GL-5 in mine with a recent tear down due to bearing failure at 250,000 miles - no syncro problems I could see other than normal wear and tear. __________________ '67 C20 small window Fleetside - 250 inline 6 - 3 on the tree - heavy duty clutch, brakes, rear springs - 17.5 wheels w/bias ply tires - AM radio - heater.

12-07-2010, 06:41 PM	#7
Guy58 Registered User Join Date: Oct 2007 Location: Albuquerque, NM Posts: 158	Re: Sae 90 Thanks guys I will use 85/90W with GL-5 if I can not find GL-4. heyjoe Could you pass the name brand and where to get it on to me? guy58

12-10-2010, 10:21 AM	#8
heyjoe Registered User Join Date: Apr 2003 Location: New Orleans area Posts: 198	Re: Sae 90 Hey GUY58 No brand name in particular. Most the oil companies package this, it pretty much depends on what your local auto parts store happens to carry. Me, I get whatever's the lowest price. __________________ '67 C20 small window Fleetside - 250 inline 6 - 3 on the tree - heavy duty clutch, brakes, rear springs - 17.5 wheels w/bias ply tires - AM radio - heater.

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