Sometime soon and was wondering when? This M1 is in my 2003 Tacoma(specs below)since 1500 miles on the ODO which is when I changed out the factory oil in March. Since this is the first oil change and the vehicle now has 4050 is it adviseable to change this interval a little early, say 3000-4000 miles on M1 or should I run it 6 months, 5000 miles? I am leery at this point extending this interval since the engine is so new. Suggestions, complaints and opinions are welcome! Daily Drives -2003 Toyota Tacoma PreRunner XtraCab, Impulse Red, Peppy 2.7 Liter 4 Banger, Running Mobil1 Synthetics SS 5W-30. ODO 4000 Miles. -1995 Toyota 4-Runner, Evergreen, 3.0 V6, Running Mobil1 Synthetic SS 10W-30. ODO 78000 Miles.