91 Chev K1500, 4.3 V6, 90k miles. I use E10 fuel because it is the cheapest. Vehicle was/ is a short tripper. Vehicle was purchased by my employer in 1995 with 56k miles. Took this long to reach 90k. Oil was changed every 1200 to 1500 miles. I've oened it since April or May, so I' ve put 5k miles on since then. Vehicle is a DD, sees short trips of about 2 miles to work, and a few other dailey errands. How often is too often to use TCW3 in the fuel? Vehicle has throttle body injection, if that makes a difference.
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