Turbo Oil Info Needed

[GrigioTR]

This is my first post and hope someone can give me some information on what oil to use for my turbo.  I have just purchased a Type 1 Cal Look bug that has a vintage RayJay blow through turbo.  The system has an oil bag and an external oil pump.  The car has not seen much use recently.  I want to drain the oil and refill the system and hope someone on the forum can recommend what type of oil I should use.

Thanks in advance for any and all suggestions.

[Garrick Clark]

Put 15 x 40 in it with a high zinc percentage.

[spoolin70]

when you say 'oil bag' are you referring to a turbo sump or dry sump tank/container ?

[GrigioTR]

Dry sump with an external pump. The SS tank is behind the rear seat. Really a nice custom fabricated system with AN fittings and stainless mesh tubing.  Well thought out.

[Martin S.]

My under deck lid turbo gets so hot, the only oil that will keep the 10 psi/ 1000rpm and any pressure at idle is 20w50 Dino or something like Liquimoly 10w60 racing oil which is what I use.

[GrigioTR]

Martin,
My turbo is externally mounted under the engine tin.  It is a blow-through, with hot and cold air plumbed pretty much like the current CB turbo systems. It was built in the '80's.  I am settling in on using Swepco 306 20-50wt. in both the turbo system and the engine.

[Martin S.]

Good call. I’ve tried lighter oils in mine. Like last fall when the temps dropped I put some lighter oil in it. This year when I started driving it again in normal summer weather I was shocked to see zero oil pressure when I stopped at lights. I was revving the motor to keep some pressure there. Crazy!

[Garrick Clark]

I take it the heat of the engine thinned it further. I'm ready to do a change on mine, thinking of going thinner than the 20/50 that's in there now, but I'm having 2nd thoughts about it. I'm thinking better stick to what I normally use. It works so don't fix what ain't broke.