Engine knocking after an oil change?

You should notice a little roughness for a few seconds after a change as the oil needs to circulate again. Nothing terribly noticable though.

 

welcome to priuschat! did you move the car, prior to the oil change, and shut it down while the ice was running?

 

Again, the worry wart factor...

Molybdenum disulfide is an additive that is already in most motor oils.

The BMW, Mercedes, Audi, Porsche, and VW dealers and mechanics in Germany swear but this stuff;



For my Prius"v," I add about 4 ounces to every oil change.

Even if the engine runs dry for a few seconds, this stuff has coated the metal wear surfaces in the engine and will prevent galling.

Cheap insurance, but worth it.

 

there is a known issue with unburned hydrocarbons sitting in the intake manifold after incomplete warm up. this can cause short term combustion problems upon the next start up. might be what you had and it might not. either way, it's rare and nothing to worry about. the dipstick is also an issue, and there are a few threads on reading it properly if you're willing to search. holding it upto the light and which side to read, etc. i've never had much luck, but my eyesight isn't what it used to be.

 

No, but the engine sounds a little smoother when it cuts one and off.

There is a protective film that remains on the metal parts, even when the engine is NOT running.

 

Did the car have 0w20 oil in it BEFORE you changed it?

0w20 oil is very thin and the car sounds louder using it than it does using 5w30 or vice versa. If you had 5w30 in previously, then that could be the issue. Assume you put the correct amount of oil in and didn't allow the engine to start up when there was no oil in it.

 

OK. In the early days of the gen3 it was common for dealers to use the cheaper 5w30 oil in the same way they did for the gen2. It was indicated that Toyota UK had issued gen2 service sheets for the gen3!?!

When 5w30 oil was inadvertently used in my car it was much much quieter on start up in the morning but performance was reduced and economy was much down. This was the case for the week before taking it back to the dealers for 0w20 to be used. Once that was changed the car was much louder on initial cold morning start up. In fact it sounded better on 5w30! But the 0w20 is needed for economy and is specified.

So if the engine sounds louder in a morning after using the correct 0w20, then it sounds like the previous owner may have used something else. Does the car have a full Toyota service history?

 

Grumpy nailed it I bet.

If the car has spent its life going to the dealer for the "free" oil changes god knows what crap they have put in. My suspicion is crappy vat dino oil and a wrong viscosity also I bet and if dealer serviced has spent its life overfilled.
The dealer is really bad at oil changes. They don't care especially if its a prepaid maintenance program or freebie oil changes.
Its not Techs changing your oil at the dealer. There not going to put a guy making $20 an hour on oil changes.

There's nothing wrong with Mobil 1 its a great oil.

Now you put the super slippery super thin 0-20 M1 in there and if your a worry wart & listener oh boy you'll hear things from the engine you never heard before with 0-20.

Check the oil in the am before starting the car. Takes a long time for all the oil to drain down.
You will get the most accurate measure of oil level if you do it the first thing in the am.

I suspect your probably overfilled now.

 

I was at a shop a while back having work done on a relative's car- while there I saw them doing an oil change. There was only one opened oil drum in the oil change area with a pump attached- the guy pumped the handle a few times and put the drain plug back in. That was it... he didn't even check the dipstick level once it came down off the lift!
When I asked my buddy who worked there about there only being one oil drum for the whole shop?- he kind of laughed and said all the conventional oil cars get the same oil (regardless of what the manufactures recommend).
I have a sneaking suspicion that this isn't shop on the planet that fills every car from just one oil drum...

 

Exactly. Dealer crappo vat oil. I don't care what they say is in the vat its still in a disgusting vat that's never been cleaned. You should see how nasty the truck is that fills the vat. No thanks.

Can you imagine how hard it is to clean an engine oil vat? I wouldn't want to do that.

Then you got the auto pump that's not very accurate so the oil change guy will give you an extra shot just to make sure its full. This explains the hundreds of complaints on this site of dealer oil change overfill.

Like you I got a bad feeling that everybody especially the "prepaid maintenance" new cars get the vat. The dealer is not going to bust out $6 a quart synthetic oil on that deal. They would lose there nice person on that deal.

And the dealer never ever loses.

 

Have you seen this: NEW!!! Service Bulletin for Engine Knocking at Startup T-SB 0012-10 | PriusChat

 

Nonsense, MoS2 is used in moly greases but not in engine oils, because it's not soluble in oils. Engine oils use soluble MoDTC.

Source: I'm a BITOG veteran.