I know I'm probably going to get reamed for this...

I read somewhere (possibly in this forum) that iso 46 is very close to spec. Am I totally wrong? Should I go with febi or OEM only?

Amazon.com: Warren LU52462G "Lube King" AW ISO 46 Hydraulic Fluid, 2 Gallon: Automotive

Any other alternatives? Just want to pick up something local and not have to wait for shipping

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1984 300td euro turbo