Hmm... I smell a rat somewhere. Where did you find the capacity? The owners manual? If so, and they CHARGED you for 7.5 quarts, they only put in the 5.5

 

Hmm... I smell a rat somewhere. Where did you find the capacity? The owners manual? If so, and they CHARGED you for 7.5 quarts, they only put in the 5.5

jiffy lube in my area has been known to screw people i would never trust them, and im not bashing on anyone else that works at any of these companies but some people shouldn't be working in these places for these kinds of reasons.

 

Get your oil changed at a dealership, or do it yourself, don't trust valvoline or jiffy lube, they're out to screw you. 7.5 quarts would be coming out your valve covers and would have blown your rear main seal. Go back to them with the manual stating that it takes only 5.5. The idiots there probably put two quarts in their realized that they didn't put the plug in, or they decided that you wouldn't know better, and that it was an oil hogging cadillac. My longblock 350 doesn't even take that much. Best of luck to you.

 

Thanks for the feedback. I did ask if he remembered to put the plug in! :bonkers: I checked the oil level myself and it's not overfull, so no danger to the engine. I wanted to be more certain of this engine's oil capacity before I raise pursued this issue further.

 

I just had the first oil change since I have had my 1990 4.5 L Deville and the place I took it to (Lube Pros) did not charge me for extra oil.

Then again I have been going there for years...

 

Don't forget your oil coolers people.
My 1993 DeVille 4.9 takes 7.5 quarts but says 5.5 are needed.

 

Final update. I don't have an oil cooler, so I'm factory compliant. After looking over older receipts and confirming that this was out of the ordinary, I went back and spoke to the manager. He looked at the car and said that's 5.5 quarts and offered to refund the overcharge or give me double the value in the form of a coupon. Thanks for the feedback from everyone.

 

7.5qts?

maybe they thought it had the NorthStar? that has 7.5.....

....my 4.9 only takes 5.5-6 quarts when doing an oil change (1993)

there is no way it would take 7.5...... and if they charged you extra, I would et pissed and go back... they may have used empty contanors....

...but 20W-50? what the hell did they put in that? the most an 4.x engine should use is 10W-30..... if there is 20W-50 in the engine, you're gonna blow it up as the oil is too thick to get into some small passages....really, if that is anythin besides 5W-30/10W-30, get it changed....

 

Due to the high mileage, I was advised to move up to a higher viscosity oil. Did I receive bad advice? I've been running this oil for 30-40K miles at least (> 4 years). Now, you must understand that I live in Austin, TX where we watch winter on the TV. I've got 160K miles on the engine and it runs great. I change the oil every 3-5K miles.

 

Yeah I have a 91' Sedan deville I never get charged extra it takes 5 things of oil. :bonkers:

 

Due to the high mileage, I was advised to move up to a higher viscosity oil. Did I receive bad advice? I've been running this oil for 30-40K miles at least (> 4 years). Now, you must understand that I live in Austin, TX where we watch winter on the TV. I've got 160K miles on the engine and it runs great. I change the oil every 3-5K miles.

Well, if you have been running it that long, and no problems, then I am surprised....

...still, I would never run anything above 10W-30 in it... it says in the manual to never use 10W-40 at all, let alone 20W-50.... I personally would go down to 10W-30....