I use mobile i synthetic, not sure if it's tri-synth or whatever, 5w-30. I have mine gapped around .04, but it depends on how much boost and if your ignition is weak. I had them down to .030 under nitrous and there were still a few misfires. At least .045 and see how it goes.

2000 Rio Red I4 Cougar 200whp & 210wtq at 9psi 254whp & 276wtq with NX 35shot WRX TD04 Turbo, Cut Short Shifter, Strut Tower Bar, 17" ZN Wheels, Roush Springs, Starion Intercooler, NX 35 shot, HKS SS BOV, Full 3" exhaust,StreetFlight Chip