Join Date: Feb 2006
Location: San Francisco, CA
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Here's a bit of advice. You can always over change your oil but under changing it will cause damage to the engine. All numbers produced by Toyota or the oil company is conservative to ensure no damage is done. It's all in how much risk you are willing to accept.
As an FYI, I use synthetic and change it every 10,000 miles assuming I wasn't towing anything.
On my old Integra GSR Turbo (and of course synthetic), under regular driving I change every 5,000-7,000 miles without racing (depending if I was a good boy or not). When I race, I change as soon as I can... usually under 500 miles after a race.
On my wife's old Corolla, it was synthetic and every 10,000 miles.
On my Accord V6 sedan, it was synthetic and every 10,000 miles.
Cars, snowboarding, house modding.