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Old 03-03-2012, 08:12 PM   #1
SoulApostle
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Default switching oil brand issues PLEASE HELP

Hello all, I have a 07 wrx with cobb stage 2 catless. I just changed my oil a day and a half ago switching from gtx synthetic to valvoline now it acts puttery in my early rpms would switching brands over filling cause that because i did over fill a little
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Old 03-03-2012, 09:08 PM   #2
Uncle Scotty
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how much over filled??
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Old 03-04-2012, 06:37 AM   #3
mikeythejew
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Quote:
Originally Posted by SoulApostle View Post
Hello all, I have a 07 wrx with cobb stage 2 catless. I just changed my oil a day and a half ago switching from gtx synthetic to valvoline now it acts puttery in my early rpms would switching brands over filling cause that because i did over fill a little
A: You can overfill it to a point it will bog the engine down.

B: Going form a thin viscosity like 5W30* to something thicker like 20W50, will cause a loss in horsepower felt by the butt dyno.

C: An engine overfilled with oil can lead to many problems depending how much overfilled it is.

D: Switching brands with the same viscosity shouldn't be felt unless your a hypersensitive freak.

* Uncle Scotty @ 5W30.
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Old 03-04-2012, 09:29 PM   #4
CosmoTheCat
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1/2 quart overfull, no big deal. 2+ quarts over full, maybe a big deal. 5 quarts overfull, definitely a big deal.
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Old 03-11-2012, 08:15 AM   #5
megabyte5689
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I've always been told as a good rule of thumb that if you start the vehicle out with a synthetic oil, you stay with the synthetic oil. I've heard way too many stories of leaks showing up after the switch and other problems arising. I just use the 5w30 in mine and change it at the 3,000 mile mark
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Old 03-11-2012, 01:12 PM   #6
bluesubie
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Quote:
Originally Posted by megabyte5689
I've always been told as a good rule of thumb that if you start the vehicle out with a synthetic oil, you stay with the synthetic oil. I've heard way too many stories of leaks showing up after the switch and other problems arising. I just use the 5w30 in mine and change it at the 3,000 mile mark
Even though SoA recommends that you stick with synthetic if you begin using it in the latest Outback owner's manuals, this is 1980's logic. You can contact any of the oil companies and they will tell you this. Oil manufacturers today balance their oils much better than oils only just a few years ago. Now if if have been running conventional in a WRX for 75,000 miles at 6,000 mile intervals, chances are there is a lot of sludge in the engine and around the gaskets and seals. Switching to a synthetic in this case will clean up the sludge and perhaps leak past the seals that were previously blocked with sludge. This is just a case of poor maintenance the first place.

http://www.mobiloil.com/USA-English/...eage_Cars.aspx

http://www.mobiloil.com/USA-English/...ics/Myths.aspx

Myth: Mobil 1 will leak out of the seals of older cars.
Reality:

Mobil 1 does not cause leaks. In fact, new Mobil 1 was tested in dozens of industry standard and original equipment manufacturers (OEMs) tests to prove its seal performance. It is fully compatible with the elastomeric materials from which all automotive seals and gaskets are made. If an older engine is in good condition and does not have oil leaks, Mobil 1 provides the same advantages as when used in a new engine. ExxonMobil recommends taking measures to repair the leaks, then using Mobil 1. ExxonMobil also recommends following the automobile manufacturer's manual for the proper oil to use.


-Dennis
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