I am getting ready to try GC in both my Toyota vehicles. The first due for an oil change is my 2003 Matrix (approx 53.5k) with the 1.8l 2ZZ. The second, due in a few months, is my 2004 Tacoma (approx 32k) with the old 2.4l(not sure of the engine code). Has anyone used GC in these engines before and if so, what kind of results? I haven't waded through the umpteen pages of UOA's and wouldn't really understand them anyway. Both engines spec 5W-30 and I stick with a 5k OCI. I would be willing to "maybe" try a 10k OCI with a filter (OEM) change at 5k if the numbers are good (I would actually pull a sample around 3.5k depending on the Blackstone turnover rate). Thanks in advance for all your assistance.