I just posted my results of an interesting and disturbing oil analysis in the Used Oil Analysis Section. My silicon number is quite high yet my wear numbers look really good. I have to consider that either myself or the oil analysis lab may have contaminated the sample. I sample with the Amsoil sampling pump through the dipstick and use new tubing for each sample. So, can you oil analysis pros spot a contaminated sample versus just plain old dirty oil? I will be draining the oil and taking my 10k sample in the next few days. That sample should confirm whether the silicon count is for real or simply an error.