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Thanks for all the info.:-D I know my son (known here as dogtag) has pics of some of the museum's trucks, just don't know where he has them now. He took some nice night shots of the WC56 that I helped with. And he has some shots of others too. I'm not sure if he has some of the M890 yet. If...

Hiya All. I'm kinda new here. At the Military Veterans Museum in Oshkosh, WI we have an M890. I've seen reference to M891, M892, & M893 but am having a hard time finding out more about them...:?: What are the different models? All I know so far is the M890s are 2wd. Thanks for your help. Roger

With AMSOIL it's more than just advertising. They do the testing and so do a lot of others. As you say, the best way to know what you have is to do the oil analysis every 10-12k miles or oil change.

AMSOIL uses the 25,000 mile oil change interval as standard for cars and light trucks. Usually for bigger trucks they say 4 times longer between oil changes with AMSOIL because it is a better oil. THey have done much testing over the years since 1972 when they introduced synthetic motor oils...

Best synthetic oil Hi Guys, Just to let you all know, there is another full-synthetic brand oil out there that out performs Mobil and Castrol. It's AMSOIL. I use it and sell it. Change once a year in my (civilian) Jeep. They make a full line of synthetic oils for all engines from...