Shell Helix Ultra (5W-40) or Mobil 1 (5W-50) - Maintenance & Repairs - MyCarForum.com
Page 1 of 2 - Shell Helix Ultra (5W-40) or Mobil 1 (5W-50) - posted in Maintenance & Repairs: Which do you think is better though Mobil 1 more expensive. ... how about SPC SAE 5W-40? SPC SYN ACE is an advanced super performance fully synthetic motor oil....