Schaeffer 75W-140 Questions

[Onug]

I really like the Schaeffer engine oil, so I'm considering using their gear oil when I change my rear diff fluid on my F-350. I have a few questions I'm hoping you experts can help answer.

1) I have a LSD and I don't see anything referenced on the Schaeffer website about additives already in the fluid. Can I use any LSD additive with the oil, or is it better to use LSD additive only with a brand's own oil? If I can use any, what's recommended?
2) Schaeffer offers five different ISO grades for their 75W-140 oil (http://www.schaefferoil.com/gear-oils-lubricants.html). Are they all compatible, or is one better for my differential?

I'd love to hear about others that have used/ current use Schaeffer's gear oil and how they like it.

Thanks for helping the new guy

 

[dave1251]

New guy no experience with Schaeffer Oil but it is one of highest respected oil products company in the country. I would just use their contact form on their website just type "contact" in the search box fill out the form and ask your questions.

 

[Colt45ws]

You should use the Ford LSD additive. I doubt it has any additive already in it, being that it is geared towards industrial applications.
You are misreading the chart on the site. Only the ISO 320 stuff is also rated SAE 75W140. ISO is a viscosity classification as is SAE, but more intended for industrial applications.
You may run into the problem I was having. I couldnt get it in reasonable sizes. I just dont do differentials often enough to buy a pail of the stuff.

 

[Food Scientist]

Originally Posted By: Colt45ws
You should use the Ford LSD additive. I doubt it has any additive already in it, being that it is geared towards industrial applications.


That is incorrect. I know for a fact that their gear lubes (especially the 167) have the limited slip additive. I use the 167 75W140 in my F150. I have read from the chief chemist of Schaeffer that their oil will work in a majority of applications, but for some reason Fords experience some chatter still. If this is the case (as it was in my pickup), add a little bit of the LSD fluid from the Ford Stealership.

 

[Colt45ws]

I thought about suggesting running it, see if it chatters, and add if needed. However, I decided against it. I was about 90% sure it didnt have an additive. Good to know!

 

[dailydriver]

I am glad that the L.A.T. gear oils I am currently using have NO added limited slip FMs.

That way, I can add as much XL-3 additive claim to have added limited slip FM have NEVER stopped low speed, coasting turn; chatter, noise, groaning, or sqawking in my Eaton without adding A LOT more XL-3 anyway!).

 

[Onug]

Thanks for the feedback folks...

 

[salesrep]

You do NOT need to add any additive with Schaeffers 167 pure pao.
Thousands of happy Ford owners have run Schaeffers 75-140 in their rear ends as well as the #293 75-90

 

[Food Scientist]

Originally Posted By: salesrep
You do NOT need to add any additive with Schaeffers 167 pure pao.
Thousands of happy Ford owners have run Schaeffers 75-140 in their rear ends as well as the #293 75-90


Sometimes you do because my 2003 Ford pickup used to chatter with the 167 especially under a load until I added some limited slip additive.

 

[beanoil]

Only problem with Schaeffer is that the 75-140 only comes in 5 gallon pails. I love their stuff,but couldn't see paying for, or buying that much lube and opted for Delo 85w140 with a bottle of Redline LS additive when I did my F350 a couple weeks ago. A case of Delo was 60 and change.

 

[Onug]

I emailed Schaeffer last week and still haven't heard back from them…pretty lame if you ask me.

After researching their products some more, I too realized the smallest container they offer in this weight is the 5g bucket. That sucks, but it is their loss…

Guess I'll do some more research here for the next best fluid...

 

[beanoil]

onug, You don't mention what year F3fiddy you have, but if you are changing diff lube, and it's a stamped steel cover, the factory aluminum cover with cooling fins from Ford for the late models fits, and is cheap. I got mine from Tousley Ford for around 53.00 shipped. A Fel-Pro gasket made the job easy. You'll need a dozen 1/2 inch longer bolts because the cover is thicker. I got them at the local hardware store. This is on my 2003...

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[Onug]

Beanoil…I'm running a 2010 Effy. When I change my fluids, I'm going to install Mag Hytec covers for increased capacity and (more importantly) drain plugs for future changes. I like the AL cover like what you have, but it doesn't have the drain.

 

[beanoil]

Originally Posted By: Onug
Beanoil…I'm running a 2010 Effy. When I change my fluids, I'm going to install Mag Hytec covers for increased capacity and (more importantly) drain plugs for future changes. I like the AL cover like what you have, but it doesn't have the drain.

Yep, no drain... But reasonably priced, and since my truck will only see about 5000 miles a year, I won't be cracking it back open anytime soon. It was a good balance of price and function for me. Good luck with your project..