[IridiumRS400]

The Infiniti engineers had good intentions - put small CHRA turbos on a 3.0L V6, and allow them to spin-up to 240,000 rpm. The smaller turbos reduce lag, and on the Red Sports, are equipped with a sensor to feedback impeller rpm to the ECU to control boost levels via the on-off electronic wastegate. The advertised 400-hp at the crank for the Red Sports was likely under-rated.

Oil question - 0W20 is good for the expected oil temps in the sump of the VR30 and its small bearing clearances, but I'd wager that 5W30 is better-suited for the turbos, especially for localized heating and those 240,000 rpm boost excursions. Infiniti had to specify 10k mile OCIs, but only for marketing purposes to keep non-enthusiasts from being swayed by other makes. 10k miles OCIs are a fools-errand for engine & turbo longevity.

In my case, I've had turbo-equipped cars since 2003, and my '17 Q60 was the 1st time I encountered a (31k-mile) turbo failure. I ran a 1.3 bar map from 14k to 31k miles, and the failure was due to the impeller of one of the turbos rubbing on the housing, causing a whistle under-boost. Was the failure due to the extra 4.5 psi boost, or a turbo defect? I've run higher boost maps on most of my other turbo cars, mainly German (Audi), and not seen any turbo failures.

After my Infiniti dealer replaced both turbo AND the engine under the Powertrain warranty, based on the potential for ingesting metal bits through the intake tract from the damaged turbo, I decided after 6 years of ownership to trade-in my Q for a new '23 Audi RS5.

 

[IridiumRS400]

I give up, what's a catch can and what does it do, where to get one, how to install, etc?

A can with a baffle that is installed between the PCV Valve and the intake manifold port, and it is designed to capture oil vapor that would otherwise get introduced into the intake manifold runners/engine. Its purpose on a DIrect Injection engine is intended to prevent oil vapor from collecting on the back-side of the intake valves and build-up deposits (bad).

Note: In port-injection engines, the fuel wets the back of the intake valve and essentially washes any collected oil vapor off the valves and into the combustion chamber to get burned.

Z1 Motorsports makes a nice form-fitting and effective kit for the VR30:

Z1 Q50 / Q60 3.0t Baffled Oil Catch Can Kit - Z1 Motorsports - Performance OEM and Aftermarket Engineered Parts Global Leader In 300ZX 350Z 370Z G35 G37 Q50 Q60

 

[IridiumRS400]

It wasn't Z1 Motorsports, it was ADD W1 with its CF can option:

For Infiniti Q50/Q60 3.0T Baffled Oil Catch Can kit V3.3 2016+

 

[IridiumRS400]

I've had my Mishimoto installed for years with no problems. Easy to remove and empty it too.

It doesn't look like Mishimoto offers an OCC kit for the Q50/Q60 w/VR30 anymore...

2018 INFINITI Q50 | Mishimoto

However, it is still offered for the Nissan Z w/VR30 (different mounting bracket):

Baffled Oil Catch Can, PCV Side, Fits Nissan Z 2023+

 

[IridiumRS400]

Here is the Mishimoto kit.

Direct-Fit Catch Can fits Infiniti Q50/Q60 3.0T 2016+

Infiniti is no stranger to the luxury sedan segment, taking on the likes of BMW, Mercedes, and Audi. The introduction of their VR30DDTT made the 2016+ Q50 and Q60 into a rocket ship and blasted the manufacturer into the stratosphere alongside the typical posh sedans. Luxury is all about the...

www.mishimoto.com

Well, their webmaster needs to change their webpage - simply plugging in a 2018 Q50 doesn't get the OCC listed as an applicable product.