Ravenol STOU 10W-40

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What kind of car? Seems like a general purpose non-API lube for gear boxes and machinery.

I wouldn't; especially when modern engines have lubes specifically formulated to address their challenges.
 
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'92 Roadmaster Estate Wagon, with a 350. Suitable for use in gasoline and diesel engines. This company does have API oils though, just curious.
 
If their CG-4 claim is legitimate, I'd see no reason why not. But, given the laundry list of bizarre specifications listed, I would be wondering.

For those interested, the claims are thus:

API GL-4, API CG-4, SAE 10w-40, ACEA E2, SAE 80W, SAE 80w-90, 85W-90, 85W, 80W, HLP-D/HVLP-D (ISO VG 32-100)
 
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