OIL Wt Topic ONLY__NO BRANDS Allowed!

[mikepvg]

Since oil is such a sensitive topic I don't want to hear about any particular brands! However,I would like to here everyone's experience's with the different weight synthetic oils for the Dana 80 LSD differential.
Specifically the GL-5, 75w-90 vs the 75w-140.
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My owners manual states:
75w-90 is for below -10DegF temps.
80w-140 is for all temps.
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Addendum to owner's manual states:
If u pull for a significant # of miles, to reduce overheating use 75w-140 synthetic.
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My Dodge Manual only states to use 90w Gl-5.
From reading this forum I know ALOT of people are using the 75w-90,but I have no idea what percentage use it & under what conditions and/or if anyone has experienced any heat related problems dependant upon outside temperature & load pulled. I pull aprox 6-8000lbs in the Rky Mtns w/ a soon to be BOMB'ed motor. Installing Mag-Hytec next week. Thanks for keepin it CLEAN! #ad



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94 2500HD 5sp 4. 10LSD 4X4 ABS w/GearVendor OD, K&N Oval w/ Pre-Filter, "STRAIGHT" Exhaust, Geno's Fumotovalve, 121,000 miles. NRA Member. V1. Rocky Mtns CO

[This message has been edited by mikepvg (edited 01-12-2001). ]

 

[dpuckett]

Mike,

I would use the 75-140 synthetic if you can find it. I have a 93, and do not do a lot of towing right now, but I have towed with it in 90+ heat through Denver with a 24x8 box trailer, and had no problems. I put a 75-90 synthetic in my Dana 70. I will add this- if you have a pinion (or any other)leak, fix it when you do the switch. The Clintonistic (you know, slicker?) oil will slip out through any slightly less than optimal seal. ANd dont forget the friction modifier. Some say one is good enough, I put in two just to be safe in my mom's 92.

I see you are from Evergreen. My truck came from a stable out Hwy 74 (?). Guy now drives a PSD (wife wanted a Ford) and regrets it. Said the 93 pulled better and used less fuel.

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Daniel's current truck: 1993 W350 club cab, 5 speed, treadplate aluminum flatbed, 4. 10 rear end, straight pipes, K&N, "slightly" tweaked pump. ISSPRO color coded pyrometer and 50psi boost guage. IRBCTS.

 

[Sled Puller]

I use blank blank 75-90. I may be switching to blank blank 75-140 because of truck pulling, have not decided yet.
Gene

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1997 Cummins Dodge 4x4 Bombed & Amsoiled. Amsoil Premiere Direct Jobber, Member of: NRA Business Alliance, GLTDR, WANTED: Wrecked Dodges.
www.awdist.com

 

[Bob Beauchaine]

I used 75W90 in my '93 until I put in a diff temp gauge and found that I was running at about 150 degrees unloaded. I switched to 75W140 and have seen as much as a 40 degree drop under similar conditions.
Happy Trails

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1993 250 4X2 - Banks Power Pack, BD Power Injectors, K&N Air Filter, 6 gauges and tweaked pump. 27lbs boost unloaded.
Horton fan & NV4500 5 speed.

 

[Joseph Donnelly]

For a vehicle that sees very low and high ambient temperatures, and heavy towing, 75-140 is probably the best. I expect the film strength and shock protection to be better than 75-90. Also it tends to leak less than 75-90. GL-5 or GL-6 is preferable; use limited slip additive only if you have that type of diff, and only as much as needed. The lube is better without it when practical. With around 8 qt. capacity, such as Dana 80 with Mag Hytec cover, two 4 oz. bottles is enough.

 

[paccool]

75-140

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Stan
93 2WD extended cab, Banks Power Pack, K&N Air Filter, PW Injectors,Auto w/4. 10 rear with limited slip, US Gear Exhaust Brake, 31/2" Exhaust, 5K air bags, Boost/Pyro/Tach Gauges, Green/Silver, new 40-20-40 bucket seats, 149K

 

[JJW_ND]

Mike:

I have used the 75W90 for the last 150K. I Dump every 30K and sample. The last two samples came back with the oil in very good shape (low TAN and Iron). Proably good enough to go to 50K intervals. I have the Dana 80 LSD and always add 2 bottles of Mopar additive. I had a rear wheel seal leak when new that was changed. I switched to synthetic 75W90 shortly thereafter. I have not had any leaks or even wet areas at the current 186K. Our cold winter are very hard on seals.

I talked directly with Dana Light axle division when I was first deciding what to put in. AT THAT TIME, the stated other then the a few of southern states or trucks pulling extreme loads daily, 75W90 was the best. In fact they really caution against too heavy a weight in Northern Climates, synthetic or not.

BTW, I pull new stock and equipment trailers with mine. Most loads are too long (80 Total) or too heavy (35K Gross) to be legal in most states.

What ever oil you put in, sample it at 15K and then 30K intervals after that.

Enjoy your Truck.

jjw
ND

 

[amsoilman]

I think someone on this thread said the GL-6 is preffered over the GL-5 gear lubes. I just want you to know the GL-6 Lube rating is obsolete. Not used anymore in the gear lube classifications. It was intended for "severe service" involing high-offset hypoid gears.

I think the 74W-90 synthetic is just great, and have just recently taken a sample at 60,000 miles of use, and the report came back as,"conmtinue use and re-sample at next schedueled interval". I will not mention the brand I use, but it is "blue" in color!

Wayne

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94'SLT 4X4 AT/White in color. Factory Tow Hooks & Running Boards. Amsoil By-Pass filter, Amsoil Air cleaner,and all fluids are Amsoil. Optima "Red Top" batteries.
BD exhaust Brake, BD Torque Lock, BD Torque Converter, Dr. Performance Stage II Injection Pump. Mag-Hytec Diff Cover,Mag-Hytec Transmission Pan, Isspro Pyro, Boost,Oil temp Gauges mounted in 3 Gauge post mount. One gauge monitors Engine Oil, Trans, Diff. Temps.
Wayne Owen

 

[Cooker]

I'm curious as to why the 75w140 oil was cooler?

Bob, was it the same oil other than the weight (brand, syn, ect)?

Also, I assume the GL-6 is just a new rating, is there any benefits to the GL-6 over the GL-5?

Curious, I've read that and oil with a LS additive does not protect as well. IMO it seems that the oil wouldn't protect as well because of the contaminates put into the oil by the POSI unit, not simply because of the additive in the oil. Comments?

 

[mikepvg]

This thread meets the KISS (Keep It Simple Stupid) requirements on ascertaining proper gear lube wt w/o all that brand hostility! #ad
The TDR membership (by a slight majority sampling on this thread) sees the heavier 75w140 as best choice. As confirmation to this thinking: I just received a reply to my own inquiry from a Technical Service Representative in the Spicer Light Axle Group(Division of Dana which produces these axles) recommending 75w140 synthetic. As an additional note: After researching numerous Technical Data Sheets readily available from a variety of oil manufacturers, I have found good availablity of numerous 80w140 synthetics also with Dana Axle Division approvals. #ad

 

[Cooker]

Which gear oild did you find the Dana approval on? The only one I found was Shell Spirax S. Also did you find the approval on any sold in quarts and not 5gallon pails?

Ryan

 

[mikepvg]

Ryan
I contacted every oil distributer in the Denver area. (5 gal availablity only. ) Along w/ the Spirax S, I also found Dana approvals on Texaco Syn-Star, 76 Triton Syn Lube EP, Exxon SGO, & Pennzoil GearPlus Super-EW. I'm sure there are others but I limited my research to local availablity. I found EXCELLENT pricing w/ the only draw back being the 5 gal pkging problem.

If you have a fax#, I can fax you a copy of the info sent to me by Steve Kouts @ Spicer. Basically his fax recommendation is based on there original engineering drawings for the 75w140 Syn. (You'll pay a "ton" for that extra 5w in fluidity. )
His fax lists several 75w140's that I could not find:
Texaco Syn Star GL Code 02080
76 Syn Gear Code 51040
Citgo Code 93020
He also mentioned that you could find 75w140 Syn @ Ford dealers (Ford part#F1TZ-19580A. )

Castrol sent me info on there 75w140 Syn that they supply to BMW dealers (part# SAF-XJ).
And of course you have the Mopar part# 4874469

Hope this helps! #ad

Mike

 

[Cooker]

Thanks Mike

 

[DMC]

Any Suggestions on Tranfer case lube. I certainly believe Dextron 3 is to light.
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D McGrady 1996 Club Cab 6BTA 5. 9 12 Valve All Stock Except K&N and Wrangler A/T 305/70/16 136 K and going strong.

 

[Cooker]

I agree that most ATF's are too light. Many of my friends run 30w motor oil in their T-Case but this is on their summertime play vehicles where cold weather flowability is not an issue.

Since this is a "NO Brands Allowed" post I will send you an email of what I'm using.