I have been using Amsoil for many many years because it’s the best in my opinion. However, I recently began using Royal Purple because the price of Amsoil has become outrageous (my 50 HP Kubota tractor takes almost 3 gallons of motor oil). Royal Purple is a very high quality synthetic oil at about the third of the price of Amsoil. A poor quality oil filter negates the advantages of a good synthetic oil, so don’t try to save a few dollars on the filter, I use WIX XP filters. I will continue to use Amsoil small engine oil on the golf carts since they only take a quart each oil change.
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