gear oil question

**kevk77** · 03-04-2010, 05:59 PM

I screwed up today. To make a long story short I meant to grab two bottles of 75w-90 at oreilly and I guess I grabbed 1 bottle of 75-140 on accident. So I have half 75-140 and half 75-90. I didn't realize it till I had 2/3 of the bottle poured in. I know I should drain it but at 20.0 a bottle and a messy job I was wondering what yall thought If I just ran it.

**jerri311** · 03-05-2010, 10:18 AM

I think you will be fine.

**jerri311** · 03-05-2010, 10:19 AM

Unless you want to spend another $50 doing it right away.

**Lawnboy** · 03-19-2010, 09:52 PM

your fine! i ran lucas oil additave and lucas rear end gear oil

**kevk77** · 03-20-2010, 09:58 AM

I just went ahead and changed it again with the right stuff. Im sure it would have been fine but it kept bothering me.

**Lawnboy** · 03-20-2010, 10:04 AM

I am the same way , my TA cover was dripping a bit, i could wait to redue it

**Knight** · 03-20-2010, 12:57 PM

Better to spend a little more $ and have peace of mind. I don't think it would've hurt anything but mixing oils can be a tricky thing. Sometimes they do strange things...

**Lawnboy** · 03-20-2010, 05:42 PM

I use Lucas, if it keeps tractor pullers rears together that have 3,000 hp , it will work fine in my 740 hp street car

**SteveC** · 04-02-2010, 07:27 PM

I use 85-140 dino oil in my rearend, the thicker oil will help disapate the heat better than the 75-90.

SteveC

**c5z28** · 04-02-2010, 08:36 PM

I have a buddy in my differential class who used dino based instead of synthetic like the manufacturer said. It was real cool taking apart that rear end and looking at the carnage it did all over the bearings and races.
Good practice to do it right the first time and not the second time

**SteveC** · 04-03-2010, 04:41 AM

Originally Posted by c5z28

I have a buddy in my differential class who used dino based instead of synthetic like the manufacturer said. It was real cool taking apart that rear end and looking at the carnage it did all over the bearings and races.
Good practice to do it right the first time and not the second time

I have been running dino oil in my differential for 9 1/2 years, and I have absolutly (sp) no issues whatsoever.

SteveC

**sjsingle1** · 04-03-2010, 06:53 AM

i think originally GM used the 85-140........then changed it to 75-90.....no biggy as far as i know

**c5z28** · 04-05-2010, 06:12 PM

Originally Posted by SteveC

I have been running dino oil in my differential for 9 1/2 years, and I have absolutly (sp) no issues whatsoever.

SteveC

My friend has a f-150 so his tolerances are different then ours( my point was simply my friend did not follow manufacturer spec). I should have taken a pic, oh the carnage!