Engine builder wants me to use straight 30w (dino oil) in my engines? Which do you folks recommend?

Wannabe

My builder told me straight 40. I use NAPA with the gold filters.

Powerplay- I got the wix filters , I just don't know if I should use Rotella t1, or Delvac or a straight 30w Penzoil. The Merc oil is sythetic so 25w-40 so I could use that.

Are you saying use Napa 30w oil?

Wannabe

Mobil delvac super 1300 15w40 Made for Diesel / super charged or turbo gas engines.

Rockfish- I have roller cams - that Delvac is good to use? My temps run low no thermostats in the engines.

Wannabe

Ask your builder. Mine told me to use the napa 40. No synthetic. A few of my buddies have bigger power than me and it's all we use.

Napa 30w it is - actually it's Valvoline 30 too.

Wannabe

Good deal! Maybe see ya out this summer?

Factory recommended straight 40w. I ran Mobil 15-50 in my Stinger. Zero measurable wear after 350 hours.

Wan,
If your engine builder said to use straight 30, why would you even dream of using something else ??????? As far as brand goes, I would ask him which he prefers and use that without question.

Just my opinion,

Bill Koustenis
Advanced Automotive Machine
Waldorf Md