Rb30 25 neo oil?

[lcxu105]

Just wanted to know what oil everyone else is running in their 30 25 neo's.

I use penrite hpr5 as per the neo guidelines. 

But wounding if i should go up to hpr 10 making 500rwhp. 

[Dale FZ1]

HPR30 or HPR15

[lcxu105]

3 hours ago, Dale FZ1 said:

HPR30 or HPR15

Why so heavy

[niZmO_Man]

Was the engine rebuilt? What were the tolerances? Engine builder should specify oil thickness no?

[lcxu105]

Yes full rebuild 3tho clearance all acl race series arp studs spool rods Aries forged pistons and rings.

Crank fully rebuilt. 

[Dale FZ1]

9 hours ago, lcxu105 said:

Why so heavy

With that much hp you're not likely to treat it nicely.  Plenty of revs and load, use the grunt.  So the mains and big ends are going to want film strength to carry the load of those cylinder pressures.

And you have solid lifters, no hydraulics to complain about oil thickness on cold start.

What did your engine builder recommend?

[niZmO_Man]

Penrite 5W-60

[Dale FZ1]

Just a case of using what works really.  With the ready availability of accurate/reliable oil pressure sensors to input into ECU, and easy/cheap oil sample analysis I'd suggest not too hard to monitor and change if required.

People in areas where winter temps are in single figures overnight might want the viscosity numbers lower esp for daily driving and cold startups.  My hydraulic non-Neo head has had no issues with a 15w50, or even the HPR30 with initial startups.  Queensland temps though.