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  #1  
Unread 26th October 2017, 08:14 PM
timbercomp timbercomp is offline
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Default Oil overfill possible implications

G'day!

We've recently bought an SF forester, 5sp manual, 2.0 NA and its been going well. Seems to go really well.

I've checked (and rechecked) the oil level and it looks like its a long way above the maximum marking... I know the previous owner had reported some oil weeping from rocker covers and maybe a cam seal (somewhere... sorry to be vague). Anyway, I plan to replace rocker covers when doing the timing belt in the coming weeks, and whatever cam seal needs replacing too... But I wonder if there is anything else that is possible/likely to have gone wrong with a too-high oil level?

Any other things to look out for while tinkering with a c.200,000km EJ20 would be great to hear about, too.

Thanks in advance
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  #2  
Unread 27th October 2017, 06:58 PM
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I think it has to be a very long way over to do any damage; when my car was serviced by Subaru it was always overfull. When doing the rocker covers also do the seals for the spark plug tubes. On the front end when doing the timing belt you'll be able to check around the cams, crank and oil pump for leaks.
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Unread 27th October 2017, 07:57 PM
timbercomp timbercomp is offline
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That's excellent news, thanks so much Kevin. Will take a good look, and do the seals you mention.
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Unread 13th March 2018, 10:15 PM
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Possible implications (from experience)
  • excess oil in crankcase can vapourise;
  • gets let of through PCV valve into fuel intake
  • deposits oily gunk into air / fuel intake
  • gunks up throttle body
  • gunks up oxygen sensors
  • potentially gunks up catalytic converters.

I had this problem recently from overfilling. Remedy was to get oil to correct level, clean throttle body, remove and clean PCV valve, remove and ultrasonic clean oxygen sensors, hope that cats aren't stuffed.

For some time after this I was getting sooty deposits out of the exhaust when cold / cool. Seems to have cleaned up now.

Do not overfill your oil!
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  #5  
Unread 14th March 2018, 03:39 AM
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Depends on by how much. On the race track, a bit of overfill is done to counter oil surge in corners.
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Unread 14th March 2018, 08:13 AM
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When filled according to manufacturers specifications my SG always shows above the max oil mark, and it's been pretty much like that it's whole life (coming up to 14 years old, 166,000ks) without any problems. We don't drive it particularly hard though - if that matters.
I must remember to ask the mechanic to put in slightly less when he services it. see if it makes a difference. He won't be keen though, he's pretty anal about ssticking to manufacturers specs.

You could always shorten your dipstick a bit. (please note: this was an attempt at humour, please don't actually do this.)
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Last edited by Ben Up North; 14th March 2018 at 08:15 AM. Reason: detail
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Unread 14th March 2018, 09:24 AM
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Unread 14th March 2018, 08:29 PM
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the shape of the EJ sump (narrow and deep) means the dipstick measure is more sensitive to oil level than a typical inline or V engine.

Rocker gaskets always get weepy as they age - probably just need replacement.

If it doesn't burn oil or make noises, probably good to go.

Don't forget the obligatory water pump and tensioner when you do the timing belt.

Probably also worth replacing the spark plug seals.
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