Yea, never seen or had anyone suggest 8.5qt before. I am assuming it's suggesting 1/2qt in the filter itself? Either way, I'll continue to put 7.9-8qt in mine every OCI.
I’ll be dumping the oil on a 7K mile interval (60-67K miles) on Mobile 1 full synthetic 5w-30 here in a few weeks and I plan to send it off to Blackstone for analysis. I’ll post up the results when I get them back. I’ll be moving to 5K mile intervals from here forward.
Pretty sure this is it, but I don’t recall who exactly I bought it from.
https://toyotaparts.mcgeorgetoyota.com/oem-parts/toyota-engine-oil-filler-cap-1218046031?origin=pla&gclid=EAIaIQobChMIkrXkv4jP_QIV7QKtBh1tMg4DEAQYAyABEgJ5XPD_BwE
I just dumped mine for the first time since switching over to 5W30 full synthetic. After 10K miles all looks good, I did save some to send off to Blackstone for a true oil analysis but label me a happy convert.