There are climates in this land where you would not want a 3.8 HTHSV, or even a 3.5 HTHSV in the winter time, and maybe not even a 3.8 in the summer, outside of the deep south/southwest, unless you are open tracking for multiple sessions per day, with an upgraded hybrid/big turbo.
Some on here are using a lighter 0W/5W-40 with an HTHSV of about 4.0 for the above conditions, especially without an aftermarket, air to oil cooler.
I sometimes use the Ravenol RSP 5W-30 with a 3.5 HTHSV for my summer OCI, and their straight DXG 5W-30 (~3.1 HTHSV) for the winter OCI.
I agree with the high starting TBN to combat/stave off the acids formed from moisture and fuel dilution.
These high(er) starting TBNs are usually found in the 'EP' (extended protection) labeled major brand oils found on the Wal Mart shelf, if one does not want to bother with the more costly/mail order 'boutique' type oils like Ravenol or Amsoil Signature Series.
But ONLY if the oil gets there
without using a big calcium content in the additive/detergent pack, and instead uses boron, magnesium, and possibly a titanium compound as a substitute, in order to avoid the LSPI problems exacerbated by big sulfated ash oil levels in turbo direct injection engines.