how did he check gasket?? the correct way is to do a compression test, which im assuming he might not have?

yep, he did not perform a compression test. he told me that there are no residue in my motor oil. since it is time for me to service my car also. he asked me to drive for a week or two to come back and see whether there are residue trap on the cap. BTW, my lubricant do reduce a lot

if its a very tiny amount, you can live with it. Abit of oil in the coolant can be managed. make sure to check both fluids frequently and maybe keep an eye on the temps but long as you maintain it, its fine.
its however ill advised that you run around with coolant in the oil

My 8 years old leaked all the water. Battery n other nearby area all have water stains. Mechanic quote APM brand for rm 350. Have to change la. Coolant also needed.