No one has had 5w40 t6 in stock for weeks besides places wanting twice what it costs. 3 gallons from Walmart used to run me about $70 now the only places that have it are crazy over priced .I ended up ordering Amsoil signature series heavy-duty synthetic diesel oil in 5w40 since the price shipped with discount code was about what these places are asking for Rotella now. I'm deleted the duty cycle Amsoil claims for this even in the low end for stop and go is 15k Mike's and it's 25k for highway non stop and go so it's actually cheaper compared to my 5k mile service with t6 rotella. Still can't believe how hard that crap is to find the last Two months