Potential Oil Overflow

95GTV8

New Member
Jul 25, 2005
386
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Washington State
A couple of weeks back, my car was at the shop getting my gears changed, and they said they would do an oil change for free, so i figured why not (i normally change my oil). The felt great, but lately it feels a littel werid, it might just be in my head. My question is, if the mechanics didn't drain the oil out of both places, and then they filled it up w/ 5 qts, would this really hurt performance, and would it be displayed by a higher oil temperature reading on my guage? I pulled my dipstick out, and the oil level was alot higher than full, but real scarce, and very thick down by full, but the thickness came up a little. I'm really hoping the mechanics didn't overfill it, and i will get it checked tomorrow. But would an overfill of oil, be related to a higher oil pressure reading on my guage? Thanks.
 
The higher oil pressure is most likely due to the shop using a higher viscosity oil than what you usually use. Not a big deal.

The temperature could be affected, I suppose? (due to windage and foaming)

A power loss is possible if the crank and rods are now sloshing through oil at the bottom of each stroke. I am not sure how much power would be lost though?

I would just change the oil filter and not add a qt of oil to compensate. Check the oil after letting it run a bit. That should come out to pretty close to even if the shop just forgot to drain the front sump.

jason
 
I used to play ball against Green lake/RUG. :D

An oil change costs 8 bucks (you wouldnt even need to change the filter if they just did, so it is even cheaper). If you have doubts, I would just dump the old oil and refill. Now if you know your dipstick is properly marked, that is different (they can be off by a good ways, which is why I ask. Mine with 5 settled quarts reads up near the word FULL, a ways above the hash marks).

An overfilled sump, if filled to the point of windage, should show lower than normal pressure, not higher.

Good luck.