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I thought the 1NZs didn't burn oil as badly as ZZ/AZ engines? 1qt per 2k miles is pretty low IMO, my 1ZZ-FE burned 2 qt in 2000 miles :P (cat was basically gone at 140k miles when the engine blew)
I wouldn't put Seafoam in the crankcase if that's what you asked, it has a lot of isopropanol. I don't think any fuel additive will help you because you probably have stuck rings. Some people use AutoRX or Marvel Mystery Oil but those really are not much different from kerosene (they have Stoddard solvent). If your engine is on its way out, maybe it's worth lightly running the engine with a little kerosene in the oil, or AutoRX (I think it has some additives that make it less bad than just thinning out oil).
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