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I use 15w 40. Been debating the zddp aditiveIt takes a little under 9 qts with the tall filter, but the 8.5 and check is a good way to do it.
FWIW, tall filter is less important than using the correct high-zddp oil...
Just sayin'.
Adding zddp has its own issues... Best to use an oil with the correct levels, like Lucas Classic or Hot Rod. There are a lot of specialty oils that are made for antique engines that work fine.
I think it‘s time for @ToyotaMatt to cut up one of the real 41010 he has squirreled away so we can see the differenc.