First and foremost, is a dexos approved engine oil, but many manuals in the past also used conventional motor oils, this is full synthetic. Its the only oil I can find that claims to be equivalent to GM part number 19259104, but in years past, with a number of different transmission oils, Royal...

So its not quit purple anymore more of a dark dark brown. I don't see hardly any metal in it and no burnt smell either but it was getting notchy again so I decided to change. Sent From My Galaxy Note 3. Which is bigger than my hand.

This is what Royal Purple MTX looks like in our M32 manual transmissions after 3k miles. That is not a typo; 3000 miles. The owner of this vehicle bought Amsoil Synchromesh from me and just swapped it out, and immediately noticed an improvement. Somehow, I don't think manual transmission fluid...

I bought 3qts of RP MaxGear 75w90, made for GL-4 and GL-5 replacement, and am changing out my fluid in my trans today. I, however, came across several forums that claim RP is horrible for yellow metals(brass, bronze, copper, etc.), and became concerned. So, I went onto RP's website, found the...

Hey guys, I had no idea where to post this so I put it here, saw an add that pep boys has $25 off royal purple oil and filter, may be worth checking on if oil changes are near. Just thought I'd share.

Ive been seeing a lot of people saying Red Line is a good upgrade for the transmission fluid (I'm having the same "notchy" shifting as a lot of others are having 2011 eco). I was just wondering if we can use royal purple gear oil for the cruze. Either way I will be def changing the fluid as the...

I'm a huge fan of RP. I've had nothing but fantastic luck with the oil. I was dissapointed when I noticed that GM voids warranties when non DEXOS 1 (certified) oils are used... Royal Purple hadn't been through certification... I emailed RP about 2-3 months ago and they stated they had no...