My Toyota was working fine, although it seems that it won't go over 60 mph. I would notice it would burn about 1 quart of oil after 350 miles of use. I used 10w40 oil and it would not accelerate as usual. Also in the morning or when cold starting it takes a little longer for the gears to engage. I had a complete oil change done on it using 10w30. It still runs o.k. but when I hit 60mph the truck will not go any faster, it used to do 80-85 when I needed to dart across town. Does anyone have any idea why this is happening.