Synthetic Warehouse Omaha

I use the 15-40 signature series in my RV with a 12.8 liter Mercedes Diesel. I noticed a difference on my way home from having the first oil change with the Amsoil. On our first trip my wife ask what I had changed. She said "the engine is quieter and smoother". Now it's the only oil I'll use. Thank you for a great product.

Have been running the Z-rod in my 1973 firebird formula for 3yrs. And in my 93 jeep 4.0 strait 6 and also in my sons 1986 Olds cutlass. It has the zinc our older engines need. Great product as i have also been using there signature stuff In our daily drivers for over 5 yrs. switched from mobile 1 to it great oil we now only use AMSOIL stuff including their HD antifreeze.