I'd dump that 5-30 real fast. Go to at least a 15-40 or 20-50. 20 wt. is pretty thin at room temp. I'd only use a 15-40 in winter. These oils aren't thick enough to cause problems, but a too thin oil sure will.
A new, tight bearing clearance engine may be OK with 0-30 wt synthetic, but your clearances are probably pretty loose by now.
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"You see, wire telegraph is like a very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? Radio operates the same way: You send signals here, they receive them there. The only difference is there is no cat." A. Einstein
1988 and 1990 Turbo Supras
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