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i would recommend amsoil z-rod 10w30. it is a high zinc formula with rust and corrosion inhibitors. it is fully synthetic and would be suitable to use all year. no need to change oil viscosities seasonally.
you can reach me at 419 204 0846 and [email protected] if you have questions.
 
If you are going to use this for pulling only and in summer months Valvoline VR-1 or W-851 in a 20W-50 racing oil. Also Lucas makes a 20-50 racing oil high in zinc. If you want to run a lighter weight oil Shell makes T 15-40 that is high in zinc. If you type in Racing oil on your computer you can find a lot of infermation on racing oils.
 
Oil viscosity is about bearing clearance, not compression. Does the motor have a cooling system or is the block hard decked?
Synthetic has advantages in extreme heat and extreme cold.
High zinc means nothing. Zinc is only used as a sacrificial lube if there is metal to metal contact such as on startup.
Lots or a little zinc makes no more difference to protection than a full fuel tank affects HP compared to a 1/8 full tank.
 
I agree with the amount of Zinc is not that big of a deal, in roller lifter engines that is. Zinc is highly recommended for flat tappet engines, especially as lift goes up and the aggressiveness of the cam goes up. Adding more rocker ratio also puts more contact pressure on the lobe/lifter interface.
 
More zinc does not add protection. More zinc just ensures there are more hours of zinc protection as zinc is gradually consumed.
 
I agree with buick and deere oil viscosity should be looked at and only looked at in ensuring a good oil wedge is developed when performance clearances have been used on main and rod bearings . Usually needs a higher volume pump to. I haven't seen a tractor engine come in my shop yet with performance clearances until it leaves my shop either though .Most of them that arrive at my shop takes a breaker bar to turn the crank with no rods/pistons connected and they just cant figure why it doesnt run well lol. Before it leaves my shop they can turn the crank with one hand grasping the snout of crank. As for zinc well I never read a oil label to date to see what the zinc quantity is or isnt. On a solid lift cam I do use cam breakin lube everytime . I have cams, solid lift cams with .320 lift on the cam mushroom lifters for a agressive ramp profile with 1.85 rockers you can figure the net valve lift .Valve train is light so it doesnt take over a 920 or 944 comp spring with 120 lbs on seat. Valve springs spring rate and not breaking a camshaft in properly will be more detrimental to a camshaft than zinc or no zinc will matter in my humble opinion
 
(quoted from post at 17:44:13 07/19/13) I agree with buick and deere oil viscosity should be looked at and only looked at in ensuring a good oil wedge is developed when performance clearances have been used on main and rod bearings . Usually needs a higher volume pump to. I haven't seen a tractor engine come in my shop yet with performance clearances until it leaves my shop either though .Most of them that arrive at my shop takes a breaker bar to turn the crank with no rods/pistons connected and they just cant figure why it doesnt run well lol. Before it leaves my shop they can turn the crank with one hand grasping the snout of crank. As for zinc well I never read a oil label to date to see what the zinc quantity is or isnt. On a solid lift cam I do use cam breakin lube everytime . I have cams, solid lift cams with .320 lift on the cam mushroom lifters for a agressive ramp profile with 1.85 rockers you can figure the net valve lift .Valve train is light so it doesnt take over a 920 or 944 comp spring with 120 lbs on seat. Valve springs spring rate and not breaking a camshaft in properly will be more detrimental to a camshaft than zinc or no zinc will matter in my humble opinion
Click to expand...
PS I like straight weight valvoline racing oils personally
 
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