ShadowsPapa
Well-Known Member
- First Name
- Bill
- Joined
- Oct 12, 2019
- Threads
- 180
- Messages
- 29,478
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- 35,073
- Location
- Runnells, Iowa
- Vehicle(s)
- '22 JTO, '23 JLU, '82 SX4, '73 P. Cardin Javelin
- Occupation
- Retired auto mechanic, frmr gov't ntwrk security admin
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- 3
YesI think FCA 5qt is on the safe side. Considered some drains while the oil is hot vs cold and some even let it drains over night as well.
Coincidence.I blew a head gasket on mine first car from overfilled, been filling to between the low and high marks since lol.
When there's too much oil what happens is the wind in the crankcase whips the oil into foam sort of like strong wind does to a big lake or ocean.
'Foamy oil' can be "compressed" due to the air in it, and means you now have trouble with oil pressure being low, and the air in the oil is not good for bearings and lifters, etc.
Many engines have "windage trays" in them to help isolate the wind from the spinning crankshaft from the surface of the oil. Some engines you can easily get by with a whole quart "over full", others are at risk with that much too much. Engines with windage trays are not as susceptible to the damage from the crankshaft whipping the oil into a nice chiffon.
Old school engines built for high RPM and high performance often have windage trays installed in them so they can be run with more oil and to help prevent the higher RPMs from whipping the oil.
Too much oil results in damage to bearings, low oil pressure, starvation for lubrication, issues with valve noise due to lifters not getting pure oil, etc. It's a lubrication and oil pressure issue. Normally you'd see the results on the oil pressure gauge, temperature gauge, or hear it in a noisy valve train. Imagine the impact on modern engines with VVT and VVL. OR say a Mercedes with variable intake manifold volume, etc.
My guess is that the modern 3.6 can deal with a little too much oil because it's a given many dealers, OWNERS and others, like Bubba's shade tree mechanic uncle have put 6 quarts of oil in hundreds of these things. I don't want to find out, though.
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