Valvoline Racing oil has higher zinc levels. It lasts fine. I use 30W Valvoline racing in my engines.

Here:
http://www.valvoline.com/faqs/motor-oil/racing-oil/

Even better read:
http://www.valvoline.com/pdf/vr1_racing.pdf

Why is it no one reccomenda Amsoil Dominator

I am still running M1 v-twin 20/50 in my big boat and M1 4t 10/40 in the jet boat and supercharged jet ski's. They have consistently tested well on all the forums and both have high levels of zddp (>1600ppm or 1300 for the 4t). Never bought into the purple gimmick and plan on sticking with a company that has consistently produced great products from their own R&D since I have been around racing.

Both these oils are (offroad or non-catalyst) motorcycle rated and according to a letter from ExxonMobil that is somewhere on this forum, most suited to high performance marine engines.

Yup.

Mobil has a great chart that shows Zinc, Phosphourus and many other things on all their oils on an easy to read chart here:

https://mobiloil.com/~/media/amer/us...ecs-guide.ashx

thanks for posting the chart, the link I had was a dead end

and like I said as the VRI is showing 1400 ppm and 1300 ppm of Zinc and Phos / ZDDP. Again the general statements overall of opinions of how much is really needed to offer very good anti wear protection. Oil is all about balance - you can not over base one additive too much because it can over power other additives from doing there job.

Great response Thanks! So reading between the lines SB & BUP the delvac super 1300 15W-40 with or without a zinc additive would be OK ? is that the concenses?

Mobile One 15w-50 and a bottle of Lucas Oil additive in each engine ----Never had a failure ! !