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Groucho Thanks for the info. I just found their website. $22 is reasonable for the benefit. It sounds like it'd be worth it to run a UOA at 5k miles, and if it's good, run another UOA at a 7k mile to test the OCI... then maybe another every 20k-25K miles to ensure the OCI is still a good fit...

http://blacksburg.craigslist.org/zip/1099200083.html not a bad deal... for free :-)

I used the synth blend, but I plan to use full synth next time. The truck is not driven hard, daily driver, 50% highway/50 % city, no dusty roads, no heavy towing, auto trans... I didn't think to ask Toyota because I expected to get a canned disclaimer reply of "We don't recommend anything...

What is OCI and UOA?

I have a 2003 Toyota Tacoma with the V6. Yesterday I changed to a synth oil http://www.pennzoil.com/products/motor_oil/synth_blend.html The manufacturer recommendation for oil change interval is 5000 miles if using standard oil. What should my new oil change interval be? Thanks in advance...