Oil change interval with M1

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I got a Corolla with a 1ZZ 1.8L motor which isn't normally seen as an engine that's tough on oil.I use M1 5W30 throughout about 95% of it's 54K miles. I changed the oil this Feburary and the oil currently has 3900 miles on it as of today.The color is a slightly brownish tinted amber with no noticible consumption shown on the dipstick. My drive to work takes 35 minutes so the engine gets fully warmed up everytime I use it. I am planning to change it at around 7.5K but that would take a year to reach.Would it be better to just go ahead and change it earlier as in twice a year instead of once with the 7.5K OCI? Maybe 2 dino oil changes a year might just work just as well in this application and be cheaper. What do you suggest?
 
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I use M1 10w30 and change it out yearly. I would do it every 6 mos., but it would be a tremendous waste of money. If it takes a year, so be it, I don't see anything wrong with that. Maybe a UOA is in order? I also don't see anything wrong with using dino oil twice and saving that money for something else. [ August 05, 2004, 08:16 PM: Message edited by: seotaji ]
 
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5,000 miles or 6 months is what I do in our F-150 and Volvo. I change out teh oil in my Ghia every month regardless of milage.
 
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