Quote:
Originally Posted by gpapa
I use non synthetic, but add full zddp. One bottle is enough for 4 oil changes. I think zddp was removed from engine oils as it adversely affects catalyst converters. It was an important ingredient for lubricity.
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I also use ZDDP in my oil changes! (Great stuff) The only difference is I do run Royal Purple SAE 30 full synthetic in 90% of my equipment.
Like others stated before me, todays Dino oils are better than they were in prior years. Conventional Dino 30W oil would be fine, I just prefer Royal Purple.
On another note, when most of our Cub Cadets were made, gasoline was leaded, and conventional oil had a higher level of zinc (ZDDP) added to it. Lead was added to gasoline to aid in reducing wear on the valve seats, reducing engine knocking, and to help boost octane numbers. Zinc (ZDDP) was added to motor oil as a metal-on-metal anti wear agent. So on those cold morning start ups, you want a higher level of zinc (ZDDP) to be in your oil because it will help protect your piston rings, cylinder wall(s), valves, valve guides, and valve seats.
But.....fast forward, the EPA has removed lead from gasoline, and continues to lower the amount of zinc (ZDDP) that oil manufactures are allowed to add to there oils. I use VP Racing 4 cycle ethanol free fuel solely in my equipment, Royal Purple SAE 30 oil, and add zinc (ZDDP) to each oil change!
FYI, that little bottle of ZDDP does 5 Kohler engine oil changes, so it last a while!
Hope this answered your question!
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