Hello All, I'm in the process of buying a new '06 Toyota Tundra DC PU w/the 4.7l V8 engine. I have several questions and would be interested in your responses: 1) Plan on initial oil change after 300-500 miles w/Havoline 5W30 & OEM Toyota filters - has anyone ever used GM's EOS, VSOT or CD2 additives during initial break-in period? If so, at what ratio - crankcase capacity w/filter change is 6-1/2 qts. 2) From what I've read, the Mobil 1 5W30 oil is available in three(3) versions - Regular, T&SUV & EP - after approx 5000 miles I would like to change to synthetic and use a 4500-5000 mile OCI. Any thoughts on which would be best for very long term ownership? How about GC 0W30 - there seems to be quite a following and it appears that it produces less engine noise from the previous postings. Only GC in my area starts w/"528" and appears to be Gold rather than Green. 3) It stays very hot in Jax,FL most of the year - the manual states 5w30 - I've read that Mobil 1 is a bit on the thin side - what weight would you use with the high heat and humidity in our locale. Thanks for the input - all suggestions gratefully accepted!