Originally Posted by Linster

I used 15-50 Mobil 1 for years prior to Hydraulic roller cams & the new formulas. Not sure how the new formula effects the oil.

I now use Valvoline 40w racing oil due to the Hydraulic rollers. Teague published a article about not using synthetic on these so I switched to this and it seems to be as good as Mobil 1 at half the cost. Engines are very clean and not much wear.

Just works for me.