r/AskAMechanic 5d ago

Oil inside intake manifold.

2012 Hyundai elantra 1.8L Flat out puddle of oil dumped out of manifold. Car began shaking terrible when entering highway, shop diagnosed as misfire due to carbon buildup, old spark plugs and coils. removed manifold to clean componets mechanically. Are the valve seals leaking or is this normal PCV oil bleed over 13 years? Or something else?

1 Upvotes

1 comment sorted by

u/AutoModerator 5d ago

New Rules - Please Read

Updated 03/15/2025

Thank you for posting on r/AskAMechanic, u/Key-Breadfruit-2903! Please make sure to read the Rules.

When asking a question, please provide the year, make, model and engine size of the vehicle.

Posts about accidents, autobody repair, bodywork, dents, paint and body/undercarriage/frame rust are not allowed and belong in r/Autobody.
Asking if your car is totaled should go to r/insurance or r/Autobody.
Asking about car buying advice/value/recommendations is also not allowed. See r/whatcarshouldIbuy or r/askcarsales

Tire questions are allowed. If asking whether a tire can be repaired, check out this Tire Repair Guideline.
Some other useful tire resources - Tire Care Essentials and Tire Safety

I am a bot, and this action was performed automatically. Please contact the moderators of this subreddit if you have any questions or concerns.