Thicker oil for turbo?

[Synack]

I was thinking, wouldn't it be beneficial if I got a thicker weighted oil for both my engine and transmission after going turbo?

Maybe even the diff too?

If so, does anyone have any recommendations?

[coyote]

Don't guess. Monitor oil temp and pressure, change your oil very frequently to begin with and get it analysed. That'll tell you if the oil is doing the job.

I'd "guess" you may need a 0W30, but please refer to the first two words of my post.

[Bonburner]

5w-30 if I turbo would be the first oil and probably what I'd stick to when I turbo

[Synack]

OK that solves motor oil. What about tranny/diff?

Sent from my Galaxy Nexus

[Bonburner]

I'd double check the ratings as to how much those two can handle .. I think Adv Clutch Tech thread has some blurps about them ..
I still need to replace the oils on them however .. not really liking how the stock fluids are feeling right now

also the engine oil would depend on how much boost you're running & how aggressive .. 52-30 won't cut it for higher boost and more aggressive driving

[Synack]

Max 8psi in the beginning. Maybe 10-11 after a year or so. Moderately aggressive driving.

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[Bonburner]

I'd try 5w-30 first on that as well heh.
See how it does .. of course you're going to want devices to keep track of oil temps
also ask who you're getting your turbo from and ask some of the other guys that are building a turbo see what they suggest.

[Ironsquid]

I would be weary about changing the oil viscosity. The main thing you want to worry about for turbos is oil pressure to the turbo. Ball bearing turbos gonna want less pressure than race bearing style turbos, most BB turbos need or usually come with oil restrictors.

The other issue would be either installing a turbo timer or manually resting at idle before you shut off the car. You can cake the lines with burned oil, eventually blocking flow.

If you wanted to protect against this adding an oil cooler would be really helpful. Otherwise most newer turbos you can use viscosities closer to what your engine, internals and gaskets were built for.

[cosage31]

Thicker oil will stay around a bit longer when going through the passages, therefore taking away more heat than thinner oil. This property of thicker oil is key especially for cooling pistons and turbos, and not as much for the rest of the engine, where coolant usually helps take away uneeded heat.