motor oil

slantzilla said

Another vote for 10w-30 here.

Zinc is only needed during the break-in of a new cam/lifters.

My nitrous junk has been 12.0@110 and still has the bearings in it I used when I built it the first time.

Unfortunately, oil doesn't protect piston tops from a fuel rich tune-up.

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If your racing you would use the lightest weight oil you could get away with running, but not everyone is racing here and so that doesn't really apply.

If you wanna play with weights then do so in relation to the temperature where you live, but mainly the low/cold temp. the hot side or with a multi weight the 2nd # IMO should be higher then what your climate reaches, cause then in the event of a over heat or extreme driving rpm situation your oil doesn't turn into water.

It never sees below 29* degrees and never higher than 114* degrees so I run 20-50w oil.
I've run straight 30w and 10-40w and both go thin after long freeway blasts causing a 10-15 psi drop at idle [from normal idle 40psi to 22-26psi] while stoped at a freeway off ramp which leads to less heat transfer in the oil causin g the cars temp to climb.
JME