Quote:
Originally Posted by genolan
BXX1 this makes sense can anyone give me a reason not to switch to Mobile 1 0w 40 from Castrol 20w 50. I have roller rockers but have no idea on bearing clearance. I took the car for a hard run last night and noted the pressure at idle 900rpm before (65PSI) and after (25psi)
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No reason not to try a 0W-40
oil, and see what your hot pressures are. If they're too low, then go back to the "thicker"
oil.
I'm not a huge fan of Mobile 1. It's not bad
oil for most vehicles. It's not a true
synthetic oil, but it's priced like one. IMO, that makes it a bad value.
Even in New England, a 10W-40 would not be a bad choice. 10W is rated down to -20*. So unless you're driving at temps lower than that, there's no need for a lower viscosity.
If you want a wide spread like 0W-40, you'll need to switch to a semi-
synthetic like M1 or Syntech, or one of the 4 true
synthetic oils.