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Hello, I have 4 new quarts of Amsoil ATF (red cap) in my garage that has been there for about 18 months. I want to buy 5 more ATF quarts for a transmission flush. Are there any issues for using an oil that has been sitting for this long? Is there any issues with mixing with older ATF? -FC

Since the 5000kms/3000mile rule for an oil change interval has seemed to have been debunked, I was wondering about the other rule that mechanics say, to bring in your car either 3 or 4 months. The issue for low mileage drivers, is that after 4 months, maybe i only put 3000 or 4000kms, which...