My is if you still intend to drive it everywhere on the street like you did pre-rebuild, don't put anything thinner than a 10W40 in it. Spend some time looking at how the xW30 wts thin out at the operating temps that street cars see, plus check out their low(er) HTHS (Hi Temp / Hi Shear) ratings. HTHS #s have shown a strong correlation between higher #s and better protection in hi-stress components of the engine.
is if you still intend to drive it everywhere on the street like you did pre-rebuild, don't put anything thinner than a 10W40 in it. Spend some time looking at how the xW30 wts thin out at the operating temps that street cars see, plus check out their low(er) HTHS (Hi Temp / Hi Shear) ratings. HTHS #s have shown a strong correlation between higher #s and better protection in hi-stress components of the engine.
