Originally Posted by j1234

royal purple FTW! haha

Originally Posted by Resolute

I have some UOA's done on the RP 10W-30 and one done on the 5W-30. My thoughts are that the 10W-30 appears decent, but the 5W-30 is not a very good oil based on the one test result I have. There are some consistencies with the two RP weights. Both have high iron wear compared to the average of all the samples taken so far. They also have higher than average Aluminum wear. Both have thinned out from their virgin oil viscosity. The 10W-30 is just a tenth of a point off from being a 20 weight and the 5W-30 became a solid 20 weight. The 10W-30 held up better when you look at the average mileage on the oil, and based on the high average mileage, the thin viscosity of the 10W-30 isn't that big of an issue since the RP was a thin 30 weight oil to begin with.
The 10W-30 looked good for Chromium wear and Lead wear. I like the RP 10W-30 results in regards to Lead wear. Low Lead wear is my personal emphasis when looking at an oil's ability to protect, as it is an indication of how well it has protected the bearings. The Chromium, Aluminum, and Iron are my next emphasised wear indicators. Followed by Copper and the rest of the trace elements. In this regard, the RP 10W-30 looks great for lead and Chromium, but worse than average for everything else. So overall, RP 10W-30 is just an "ok" oil in my book and I see nothing specail or outstanding with it on the whole. There are other oils that have shown much better results with similiar mileage, but I wouldn't say the 10W-30 is a bad oil to use. I am still hesitant to recommend RP's 5W-30 until a decent average can be made from more than just the one sample sent to me.
The 10W-30 UOA's were not sent to me, but posted by a member in another thread. Screen name is The Professional, and the thread is:
https://my350z.com/forum/showpost.ph...6&postcount=40
edit: RP results added to the front comparison charts.

Originally Posted by invazn

hmm after reading resolute's thread, i might try 0w-30 next.

Originally Posted by blasian

What oil do you use because I wanna be sure not to use it

Originally Posted by invazn

RP 10w40

Originally Posted by idwin

my z hated royal purple? Amsoil FTW!!!!!!!!!!!!!!!!!!!!!!

Originally Posted by thumpboarder

what up I'm back from my random "work" related trip to orlando where it was nothing but fun. School sucks making up all this crap I missed but it was worth it. And best part was after a crappy day taking tests all day my new rims came and they are in absolutely perfect condition. I'll be putting them on tomorrow after I give her a cleaning. If you saw it at school today greg I know how bad it is, thats why I didn't park next to you earlier with your car looking all clean.

btw, when did nissan start putting on the potenza re050 instead of the re040?

Originally Posted by LanceKA-T

A 0W oil is way to thin for my taste, especially in the heat we have down here.

I used to run Valvoline VR-1 20w-50 and it worked well since I'm turbo and road race, which causes higher oil temps then most. I'm undecided what I will be running in the new motor.

Castrol 10w30 right now just for breakin. On it's third oil change in 300 miles.

Originally Posted by LanceKA-T

Royal Purple 75w90 Gear Fluid in the tranny, 160K and still shifts fine. Been boosted and beaten on since 120K. Changed often

Penzoil 75w90 Synthetic in the diff, diff has close to 300k. It's seen better days.

ATE Brake fluid DOT4 from splparts.com