BLUE_SVT_COBRA

Just wondering if anyone has used the Royal Purple in there mustang.. havent heard much about it was going to try it this week.. lmk

usc49erfan

motor oil or differential?
I used the differential after the gear swap

Norse1974

been using RP for years! I love the stuff! Never had any problems with it & my motors were always clean if ever needed to be broken down! Use it in the motor,tranny & rear end for best results. Go to their website & you will see everything you need to know including tests done.

pdonket

A bunch of people swear by the stuff, I've heard far less complaints about RP than I've heard people in love with it.

To be honest, any oil out there works fine as long as you pay attention to drain intervals for the appropriate type of oil you're running. I personally love synthetics like RP, Amsoil, Pennzoil Ultra, Mobil 1 etc because for me, it means only changing my oil once a year. Some people feel more **** about changing their oil, and it makes sense to just run dino oil if you're going to change the oil every 3000-5000 miles anyway.

JAMAMAN

Hey do any of you add friction modifier to your diff oil ? Cause i just replaced the oil to RP 140 on my 4.10 gear and was wondering if its cool adding FR. Thanks

usc49erfan

depends on what type you used. RP already has it in. just check the bottle you used to see if there is any in it.

edit: just saw that you used RP, you should be fine without it, but if you still want to add the f. mod. just use one of the bottles, I believe they are like 4oz or something

senter75

I use RP and have no problems.

BLUE_SVT_COBRA

how often you change it with royal purple??

usc49erfan

motor or differential? i have changed the differential twice now, 48,000 miles, the first time was after the gear swap. going to do it again at 50,000 not that it needs to, but it is on the list of things I look to do when the car hits that milestone.

SamsBlueGT

I have been using Royal Purple in my motor since I bought my GT, and recently changed my transmission oil and diff oil with Royal Purple. No problems here, I love it!