i was reading an import mag and they had an article where they put in royal purple in an integra. it gained 3 or 4 hp on the dyno.now on a V8 i can see about 7-8hp gain just for an oil change. then add less resistance in the drivetrain and it could be about 10hp.

 

How offten is the differential fluid supposed to be changed?

 

I did a rear diff fluid change this weekend, If you have the 3.73 rear w/carbonfiiber plates, the first change is @ 7k. The price for GM synthetic 75w 90 is $28 bucks a quart, what a rip off. I used Lucas Synthetic 75w90, I got it for $9 bucks a quart.

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Maxmumboom:
<strong>I did a rear diff fluid change this weekend, If you have the 3.73 rear w/carbonfiiber plates, the first change is @ 7k. The price for GM synthetic 75w 90 is $28 bucks a quart, what a rip off. I used Lucas Synthetic 75w90, I got it for $9 bucks a quart.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Is that 7,000 miles or 70,000 miles?

 

i think that was 7k miles. i remember when i went in for warranty work at 10k the service guy said i need a fluid change. i thought that was a rip off so i didnt do it. in the service manual though it says 50k.

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by graygmc:
<strong>i think that was 7k miles. i remember when i went in for warranty work at 10k the service guy said i need a fluid change. i thought that was a rip off so i didnt do it. in the service manual though it says 50k.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I looke through the manual and did not see when to change it. I need to check and see if it has ever been done, because my truck has 68,000 mile on it. If it has not, I probably should get it done. THanks for the help.

 

Here is my experiences with Royal Purple!
The oil (racing 21 which is 5w30) gives me 15 more PSI over mobile 1 5w30.
The Coolant additive Purple Ice additive makes my 382 allbore 10 -20 degreez cooler!

Im about to change out my t-56 fluid, rear diff and power steering fluids. If anyone wants to help out your more than welcome to help tomorrow! <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
I'll post all my results when im done!
I love the hell outta this Royal Purple stuff!!

I heard to also use posi additive for the T-56 is this true?
Is there any easy way to drain and replace the Power Steering fluid?

 

They first rear diff change is @ 7k, my friend is a mechanic for GM. I Just got a list of problems from a GM tech bulliten that he gave me about our trucks. There are alot of problems with the 4.8 5.3 6.0 8.1, one of the things they are doing to fix the slap noise is to replace the push rods. I dont know if it helps anyone, bbut its covered.