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99 grand am gt... broken camshaft

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redride

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im going to start off by asking my main question then ill give some background on the car. why did my cam break with a 114,000 miles on the clock? we have owned this car since it was 4 years old with 42,000 miles on her. its a 4 door bright red tinted windows, nice looking car. my wife is the main driver. i have had tons of problems but the wife loves the car so i keep dumping money in to her. i have replaced both front wheel bearings,front coil springs, powersteering lines, head gaskets, lower intake gaskets twice, water pump twice all the normal like hoses belts brakes. just about a month ago the cam broke. so i replaced the motor with one from a wrecked car with a bunch more miles on it. it went 94 miles and the dang cam broke again and the cam bearings were tore up pretty bad. from talking to a friend of mine who own a junk yard this is a pretty common thing. the cams in these motors are hollow and insane expensive. is the problem lack of oil flow? are the oil pumps weak or just dont have enough volume. i got another replacement motor today that i will put in the car this week. is there something i can do before installation to prevent this? it seems like the bearings are failing and then the cam then breaks either from the execive play on one end of the cam or one or two bearing seize up and it breaks from stress.is there another year of motor that i can put in to get away from the problem all together? i was told its a 99 only no other one will work and i wasnt given a reason why. any info here would be greatly appreciated
 
I have seen no evidence on this site or others that there is a rash of broken cams, you dont mention 2.4 or 3.6. How often do you change the oil and filter, what weight and brand of oil are you using?
 
its a 99 grand am gt ho with the 3.4 v6. i use castrol 5-w30 and i change it when the computer tells me to by turning on the change oil light.
 
You do realize that waiting till the light comes on you are going maybe 10,000 miles between changes? Do you know what your actual mileage between changes is? Using synthetic I wont go past 7,000 and conventional maybe 5,000.
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This is actually the first car I have owned that has the ''change oil'' warning light. I'm using synthetic oil as I have been using in my other cars for the last 10 years and always been changing it at 5 000mi. The last oil change I did on this car, I have reset the oil light counter and now I'm approaching the 5 000mi mark and this time im thinking not resetting the counter as a test to see how many miles it will actually take before the light comes on. Personnally I've never been a fan of those oil life monitoring systems. I'm more the old school type that does it the old fashioned way. 3 000mi with regular oil or 5 000mi with synthetic or every 3 months...wichever comes first :)
 

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