I will be changing the oil & filter in my 318 shortly. My engine builder told me to include a 16 ounce bottle of a ZZDP oil additive with the fresh oil and new filter.
My question is do I use 5 quarts of oil + 1/2 quart of ZZDP additive?
Or, 4 1/2 quarts of oil & 1/2 quart of ZZDP equaling 5 total quarts?
