am I ok to change the filter and leave the oil as is ? it is pretty dark. I think it is time to swap oil as well ?
I plan to use ATF. I like what the guy did here
connect 1/2" ID on pressure side ...then crank the engine, refill till you see red color pouring out, top it off...and it is done. volvo vnl 2013, 1M miles ..ATF good ?