Grand Cherokee Oil Pressure

They all are. Especially when it's cold outside.

When you check oil level make sure you wait at least 10 min after shutdown of a warm engine. That ensures all the oil has drained down. 1 qt over shouldn't be a problem, just don't do it all the time. I check oil level in the morning before heading out.

By empty, do you mean bone dry or slightly filled. That can be the bypass valve being cocked up inside the filter. Stay away from Fram filters, they are not good oil filters.

Pegged pressure without a dead engine tells me your sender is shot. Time to get a new oil pressure sender, but first check to make sure the wire hasn't been knocked off the sender. Should run about $31 at NAPAonline or chryslerpartsdirect.

vbeergoggles.com

One qt over is ok? Won't that cause foaming and lack of lubrication?

Greg

It's darn close, once the engine is running the Jeep's oil pan is sufficent to handle the extra quart without getting in contact with the crankshaft. Wouldn't make it a habbit though.

My wife has a 06 Grand and our mechanic overfilled it by about a quart. I called him the day after, he came to my house personally to check the level, said we prolly shouldn't drive it, and had us bring it in to his shop so they could drain some of it. Well I own a 95 Wrangler that I do ALL the maintenence on, and fiqured letting my local mechanic change the oil in our Grand(not these instant oil change places) would be ok. Well, it pays to do it yourself.

Greg

Tends to be true of pretty much every vehicle. Possibly one with oil pan baffles might be less likely to be thusly sensitive.

Before you panic, swap the pressure sensor. They're cheap and notoriously fragile.

Then panic.