I'm planning to use GC in a 4.6L Ford(97) which has 92,000 miles. Has anyone had good uoa's or experiences on cars with high miles? acn some of you pls comment how well GC worked in your cars? it really would help me make a decision, 'cause I'm worried about seals/leaks in older cars etc. I did search; most of the uoa's and reports on GC were from not-very-old cars. Thanks a lot.