Need help with engine oil.

[jcal87]

The persons mechanic I got the car from recommended Amsoil 20w-50 full synthetic. However, I called the shop who built the motor and they said they only use that weight of oil to dyno with. Then they recommend to drop down to a conventional 10W-30 in the winter and a 10W-40 in the summer.

They also said only to use synthetic during break in then switch to a conventional oil. I have talked to a few friends of mine and a mechanic and they say go with a 10W-30 conventional or synthetic and switching back won’t hurt the engine if I decide to go with conventional.

Can anyone add some clarification to this? The car is leaking a bit of oil and I won’t to get the right stuff in there this time around. I posted a pic of the engine build sheet below.




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