Jay, I was going to do the same thing but I was just going to take a nail or something of that sort to make the marks lol. so if I use the 2zz filter it would be about 4.5qt total and like 4.75qt if I use the V6 filter? The guy who owned it before me said he used the 1zz filter and he just dumped a 5qt bottle in it lol.
I think I am going to go with castrol HM, looking on there web site it says they use a zinc alternative to help prevent catalytic converter failure in high mileage cars and my cat has been throwing P0420 codes half of the winter, as long as I clear the codes and they do a idle emissions test I will pass for now. One day the cat will fail though
cross that bridge when I get there.