My car has only 38k miles on 2010 elantra blue. The 2 spark plugs threads on the right where caked with oil... I just had an oil change on Sunday, sept. 22, 2013 and I replaced spark plugs on Monday, the old spark plugs where already caked with the new oil on them. I have already asked some mechanic friend and they said its the seal in the cylinders went bad. I think it may be worse than that... What do u think?