Re: 1996-1998 Elantras
What he said. I used 'gunk' brand engine flush. Stuff smells nasty, but it mostly works. Try not to get it on your hands, as it says some pretty bad stuff on the can about what it can do to you. ^^;
It's a fluid, so you might want a funnel to pour it in; I wound up with it sloshing off the side of the can at one point. -.-
I switched to a semi-synthetic also, and that seems to have helped with the nose a bit.
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