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For those that have changed to Castrol (or any oil from Mobil1):
Did you flush the system before pouring in the new brand, or just start using the new brand the next time you changed your oil?
I am still using Mobil1, but have strongly considered changing to Castrol and the spin-on filter adapter for my next oil change. I thought I had read a post a while back advising doing a flush before changing oils. I am no expert, so I am just wondering what others have done.
Any thoughts?
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