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Viscosity? Multi-viscosity oils are probably better than years ago with the additive package lasting longer. But as the miles pile up, the viscosity range diminishes and eventually it’s a straight weight. 10W30 is probably the best all around; 10W40 if it’s really hot. But the more you try to stretch the viscosity the more problematic it becomes. 5W30 or 5W40 are used by OEMs for certification because they think they get better mileage during start up. But good lubricity just isn’t there.
Mobil ONE 10W-30....consistency is VERY dependent on which and WHAT kind of vehicle you drive...Although Mobile ONE HAS been tried, tested and proven by Consumer Reports and Motor Trend to be one of the best oils out...well thats my 2cents
my motor runs rough at idle what is it that i need to do to fix that?
Mobil 1 is good, but expensive. A synthtic bled is good to at a better price. Viscosity...depends what the normal temperture of the area is.5w30 semi synthetic Valvoline for a 1993 350 GMC
good value, I change oil every 3000 miles.
An engine overhaul at 140,000 miles
proved NO significant wear to bearings.
If I was more of a NHRA fan I would us CASTROL .
{ ForceFully }
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