Mobil 1 5w40 ---- Silverado 1500HD Sample
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Copper is lower then iron
That is odd for the GM motors
That is odd for the GM motors
I was thinking this looks good for a GM motor.
with all the cold start knock, im not suprised its high in iron haha. I do alot of heavy towing also.
How many miles were on that oil?
That looks preety good especialy for a GM V8!!! I would stick with what you are doing and see what you see! Looks Good!!!!
about 4600 miles
Hi,
Nate - The lubricant is good for many more miles - monitor and decide when to change on its condition in future UOAs
Regards
Doug
Nate - The lubricant is good for many more miles - monitor and decide when to change on its condition in future UOAs
Regards
Doug
Any reason why you are using a 40wt up in the artic cold? I know gm specs a 5w30 in these motors, maybe that would help with your cold start knock. What year truck and motor? I know these trucks sound like they have a bad piston slap problem from the factory.
Maybe he's experiencing better numbers because he IS using a 40wt??
Don't know about your particular engine, but I always ran 40wts in my Chevy's due to the heavy towing required of them.
Don't know about your particular engine, but I always ran 40wts in my Chevy's due to the heavy towing required of them.
Originally Posted By: Harley Anderson
Any reason why you are using a 40wt up in the artic cold? I know gm specs a 5w30 in these motors, maybe that would help with your cold start knock. What year truck and motor? I know these trucks sound like they have a bad piston slap problem from the factory.
According to GM these engines have never had a problem of any kind.
Any reason why you are using a 40wt up in the artic cold? I know gm specs a 5w30 in these motors, maybe that would help with your cold start knock. What year truck and motor? I know these trucks sound like they have a bad piston slap problem from the factory.
According to GM these engines have never had a problem of any kind.
i didnt pay attention when i got the oil and it ended up being 5-40 , so i ran it anyway... and that just happened to be the sample i took lol. And yes, i do frequent heavy towing also and it tends to use a bit of oil. 2001 6.0L ...with knock, go figure
Originally Posted By: Mokanic
Originally Posted By: Harley Anderson
Any reason why you are using a 40wt up in the artic cold? I know gm specs a 5w30 in these motors, maybe that would help with your cold start knock. What year truck and motor? I know these trucks sound like they have a bad piston slap problem from the factory.
According to GM these engines have never had a problem of any kind.
That is [censored]...check any GM truck forum out there...the cold start piston knock is a BIG problem with these trucks! GM says it is normal & causing no harm. That is maybe the reason they say they do not have a problem.
Mine is a 2002 Silvy with a 4.8 & I have the slap also!
Originally Posted By: Harley Anderson
Any reason why you are using a 40wt up in the artic cold? I know gm specs a 5w30 in these motors, maybe that would help with your cold start knock. What year truck and motor? I know these trucks sound like they have a bad piston slap problem from the factory.
According to GM these engines have never had a problem of any kind.
That is [censored]...check any GM truck forum out there...the cold start piston knock is a BIG problem with these trucks! GM says it is normal & causing no harm. That is maybe the reason they say they do not have a problem.
Mine is a 2002 Silvy with a 4.8 & I have the slap also!
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