I may be blonde...but

My 2023 VNL 860 will throw a code if more than a 1/4" over the Max line. Had it happen one time after I did first PM service on it. This is one of the reasons I said I would not let it go like that. Maybe older engines are not as sensitive to that but the newer ones are gonna cause issues.

 

Years ago we were told to leave all the trucks running in the yard over Christmas because -40. First thing I do when I get back to work is check every truck in the yard. Noticed one truck didn't really look quite right. It was shaking a bit worse than the rest. I hop in the cab, its got about 3 PSI oil pressure. Shut it down and pulled the dipstick. Couldn't see a darn thing on it but it was wet. It was several inches overfull. I pulled it into the shop and dropped the oil. Normally a C12 would fill our drain pan about 3/4 of the way. I filled the drain pan, plus one more and half of another.

Truck lost an injector, filled the pan with fuel. No damage other than what the fuel dillution caused (bearings and top end mostly).

Engine's are not nearly as sensitive to overfilling as some would think.

 

Especially if their price includes oil by the gallon.

 

Dipsticks aren’t always balls on accurate. If you have any question about that you can change the oil yourself the next time and test the stick. If pan holds 10 gallons and the stick shows otherwise than remark the stick. This sort of thing was always a common thing to do especially if a stick had to be replaced.

By doing this you may find that you possibly could be running your engine under full the whole time because only 9 gallons been going into a 10gallon sump because stick was lying to you. Or vise versa.

 

The dip stick is correct it does not lie unlike mechanics, they should know how to put oil into a crankcase without overfilling it, something they usually get the apprentice to do. Just because the book says it takes 10 gallons does not mean one puts in 10 gallons, the dip stick has a marked level for a reason, and it is never good to overfill the crankcase, perhaps if it was only 1 mm over but 1/2 an inch is way to much. Did you wipe the dipstick and do another dip to see the same result? My advice do not use that mechanic again. And lower your oil level as soon as possible. Unless your engine is using oil then I would not worry to much about it as the level will drop pretty quick. You can buy these special pumps that will allow you to suck the oil up out of the dipstick. Personally I'd still use the Volvo dealer to service the truck. Bottom line it is rather easy to fill up oil to the correct level, yet these dudes still made it look rather hard to do.

 

You could overfill by at least a gallon and it won’t hurt the engine or blow seals.

 

We lease a couple of Volvo's from Penske, last year we took our older 2018 VNR to Penske for service and it came back with the oil level several inches above full. Truck ran fine and no check engine light, we needed the truck the next day so we just drained about 2 gallons out of it to get the level right.

6 months later its due for service again and once more it comes back way overfilled with oil, this time we said the heck with it. It's their truck and their problem if something happens. Truck ran perfect and we just turned it in Monday as the lease is up. Truck only had 271,000 miles on it when turned in.