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A reputable local parts dealer recommended OWS 210 Engine Flush (made in Germany) or, its industrial equivalent, Omega 907 (made in Australia) for such application. I've used the latter for my last oil change but I cannot tell objectively how well it works besides that the oil drained looked pretty dark. They may be good choices if you believe in engine flush.
Also, you can probably drain more oil out if you disconnect the hose between the engine and the tank bottom on either end instead of loosening the drain plug of the tank.
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'87 3.2 Targa
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