ya i have a 01 silvy ext cab with 80 thousand miles on it, i use mobile 1 5w30 oil in it and a buddy of mine suggested using 10w30 since it is thicker because he said when an engine has that many miles it needs a thicker oil, is this true? thx

 

First off, 80k miles is not high, 200k is As far as what oil to run you should stick to what the manufacturer recommends. They spend lots of money figuring that stuff out

 

Yeah, 80K is nothing. My truck has 85K and the Camaro has 113K - both use 5W30 without a problem.

And I plan on still using that when they do hit 200K.

 

i use 10-30 in the summer and 5-30 in the winter

you can really run 5-30 all year no problems wherever you are

 

I switched to 10w-30 and it solved oil consuption issues after the cam swap. The manual says 10w-30 is ok too. FWIW the closer the two numbers are the more resistant to breakdown the oil is.

 

stay with synthetic oil you will be fine. i ran synthetic in my camaro, untill i got rid of it 220,000 mile. motor ran great

 

dude- take it from me- first hand. a TON of time, money and knowlege is poured into telling you which grade of oil to run. Unless your buddy is comfortable saying that he knows better than the GM engineers, their tests, test proceedures and results- use common sense and stick with what they say.

If it aint broke, dont **** it.

 

I got about 265,000 and have been running Mobile 1 5w30 since day one. Stay with a synethic 5w30 untill the motor craps out on you.

 

10w30 here all the time

 

I'd stick with the 5w-30. I was using Valvoline all-climate and switched to Valvoline Max-Life when I had 80k miles. I have 135k now and no problems. Your using Mobil 1 which is way better anyways.