? for the amsoil gods

[bbodammer]

What would cause high oxidation numbers in the oil sample. (using 5w30 HDD 3000) Mine came back at 165. This was with 3k on new oil. Changed the oil b/c copper was high... replaced oil cooler... now have high oxidation. just trying to figure this out so I can quit spending so much dang money on oil I used the engine flush when I changed it and also blew the intercooler boot off once, but those are the only things I can point a finger at . Thanks in advance

 

[amsoilman]

Oxidation is usually caused from high temperatures. High Copper content on the Cummins 5. 9L engines is usually from the oil cooler. I would call 1-715-392-7101 (AMsoil Tech Services) and see what they might say.



Wayne

amsoilman

 

[Vaughn MacKenzie]

Did you replace the cooler because of the high CU readings? Might have been a waste of time/money. Both my CTDs I've done oil sampling on had a spell where copper numbers spiked dramatically, then settled back down after 10-15k miles, so I never worried about it. Numbers were in the 100s if I remember right. It's happened to quite a few guys who sampled and after awhile the high CU numbers subside so it seems to be one of those quirky Cummins diesel traits.



Vaughn

 

[bbodammer]

yes I replaced the oil cooler b/c readings were close to 600. A little high for my liking and the oil had 16K on it. Just have to figure the oxi. out :{

 

[Duluth Diesel]

The previous posts are correct.



High oxidation numbers are caused by a combination of heat, water, copper as a catalyst, oxygen, and pressure. High temps is definately something that should be looked at, but also moisture. If a truck sits a lot, condensation in the crankcase can introduce water levels to the oil, which could be adding to the problem. Just a thought.



-Chuck

 

[bbodammer]

thanks guys for the replies. I will call amsoil and see what they say as with my mods temp shouldn't be a problem and the coolant system is flushed and in good shape. Guess I will try another batch of oil :{