2005 Hyundai Coupe fluctuate in compression

Sounds like head gasket blown between those two cyls. and one feeding the other .

So with the head gasket blown would that course oil residue on top off pistons 4 and 6 and put like a golden colour on everything under rocker cover thanks for your time and knowledge

With pistons 4+6 not firing right due to low compression very likely you will get oil on top of pistons . If the head gasket is not only blown between the two cyls but also blown at water jacket or head damaged , it will mix with engine oil and turn a kind of light coffee colour .It can also go into the sump and show on dipstick . You can also get oil on pistons if valve stem guides / seals are worn but this is something that should be done if head coming off to replace the gasket . You should also get the cyl head pressure tested for cracks or damage before replacing gasket . A block test will confirm if head gasket gone .