I have a 2013 Camry SE with 61,000 miles on it. I have an extended warranty good until 75K miles. For piece of mind I would like to get the ATF flushed, Toyota dealer wants $239.99, I can get it cheaper at a Firestone shop that uses Pennzoil Platinum LV Multi-Vehicle ATF while Toyota recommends Toyota Genuine WS ATF. The Pennzoil website says it's compatible with WS. Any opinions?