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After two catastrophic rod bearing failures my boss is reconsidering devoting time to changing the oil in our compressors. I have chosen Amsoil's 30/40 ISO 100 oil as it covers what is specified by Speedaire and Saylor Beall. Here is the question. The recommended OCI with regular ISO 100 oil is...

I drove my truck mostly on the weekends. I will do about 7K in a year and a half. Does the time between oil changes matter as much as milage? If it is not it seems as though it was a good way for the auto service industry to keep cars coming in. Thoughts.

Hi, I am new to the forum and would like your thoughts on an oil selection. I use the same oil for both of my vehicles. I am looking at moving away from Amsoil. Their oil is getting costly, and I don't know if the price is justified (my last purchase averaged $7.21 a quart). Their MLM tactics...