A Disadvantage Of Ow-20 Oil?

[monya]

The ol' jalopy had its 1st service last month and I made sure it was given the correct oil. 2 days later off on holidays for a month so dear car was unused for 28 days. Came back last Friday and fired it up - well pushed the button anyway. Waited until the engine came on, about 20 secs later as usual. Oh dear dear, it shuddered roughly into life like a 2 stroke with a rythmic tapping sound that thankfully passed after 30 secs or so. No harm done I hope but I guess the new oil had sunk to the bottom leaving the bits somewhat dry. Never had this with other cars but probably haven't had thin oil before either. I'm sure the OW 20 is best for the car but makes you wonder.

[timberwolf]

I don't think that would be caused by the oil. The engine is spun up to 1000 rpm by the electric motor generator before ignition is applied and therefore the oil would have worked around the engine.

You shudder sounds like the rare engine management issue(?) that affects Toyota hybrids although it seems to occur more often on the Gen 3 (very rarely on the Gen 2, but we have our own lumpy engine starting when cold to contend with but it isn't the same thing and we have the 5w-30 thicker oil to warm up), it seems to be a combination of cold weather and maybe starting the engine but not allowing it to warm up before stopping again on the previous use. Someone with Gen 3 experience will be able to chip in if my recall isn't correct.

[Jan&tone]

I don't think that would be caused by the oil. The engine is spun up to 1000 rpm by the electric motor generator before ignition is applied and therefore the oil would have worked around the engine.

You shudder sounds like the rare engine management issue(?) that affects Toyota hybrids although it seems to occur more often on the Gen 3 (very rarely on the Gen 2, but we have our own lumpy engine starting when cold to contend with but it isn't the same thing and we have the 5w-30 thicker oil to warm up), it seems to be a combination of cold weather and maybe starting the engine but not allowing it to warm up before stopping again on the previous use. Someone with Gen 3 experience will be able to chip in if my recall isn't correct.

I remember reading some posts about this earlier in the year, i've never had it myself though.

[johalareewi]

Mr GC has had this and a search for bumpy engine start on prius chat will show up a number of gen3 prius owners over the pond with similar tales. Seeing that the Auris has the same drivetrain as the gen3 prius, it could be related. Does seem to be a rare event but might be worth having a check done by Mr T under warranty of course

[Grumpy Cabbie]

Yesterday I posted a thread on PriusChat advising that I hadn't had the rough engine start that seemed to plague the early gen3 Prii for about 12 months after they had been released. I asked if this was a coincidence or whether there had been a software or management update that stopped this issue.

The replies I had seemed to indicate that the problem is still there with some owners and that I had been lucky not to have had it recently.

To put your mind at rest the issue only seems to happen for about 10 seconds and switching it off and back on again will see it disappear. Some have suggested that the problem happens when the car has been sat in cold weather for a few days and/or if the car is switched on when cold to the point when the engine fires up and then quickly switched off - such as moving cars around on your drive etc. It only happens once in a blue moon - it has happened to me twice and both times when it was cold and the car had been stood. It is also pretty much impossible to repeat it for the dealers; who don't seem to accept that it happens (generally and going from the comments in PChat). Either they really don't accept it unless they see it happen (remember it has only happened to me twice in 60k taxi miles), or they know what the problem is and can't fix it.

Does the following video sound like the knocking?

[monya]

Hi Grumps - you've nailed it! Hadn't a clue this could happen so will dismiss the oil theory but also confirm that it affects the Auris as well, whatever it is.

[Grumpy Cabbie]

Try this link;

http://priuschat.com/forums/gen-iii-2010-prius-technical-discussion/99236-has-rough-cold-start-issue-being-corrected.html

[dervdave]

Ya bugger that sounds bad, you say its only happened twice in 60k ? I think its just as well it cannot be doing the motor much good.

Its sound like oil starvation does it not ?

Or piston slap, does that happen these days? :)

[Grumpy Cabbie]

Well Toyota remain quiet on this issue. Some believe it could also be a dodgy manifold valve and some think it's the VVT out of kilter. It could also be oil starvation but if that's the case then it happens in Canada where they still recommend 5k mile service intervals using 5w30 oil!

Parts King, where are ya???

[kevin h]

Ya bugger that sounds bad, you say its only happened twice in 60k ? I think its just as well it cannot be doing the motor much good.

Its sound like oil starvation does it not ?

Or piston slap, does that happen these days? :)

Had this happen a few times with the Gen 3.

Always cold weather and after moving the car about without the ICE engaging.

Toyota eventually came up with the idea of replacing the Engine Manifold in Sept, telling me that this should solve the problem.

I'm just waiting for the cold weather to return, and we shall see.

[Mistermena]

Kinda sounds like piston slap to me to. My oil burner sounds quieter than that! Using a 0w-20 you'd think that the oil be running round the engine like no tomorrow. Could do with "Ormi" on this one me thinks.

[dervdave]

Had this happen a few times with the Gen 3.

Always cold weather and after moving the car about without the ICE engaging.

Toyota eventually came up with the idea of replacing the Engine Manifold in Sept, telling me that this should solve the problem.

I'm just waiting for the cold weather to return, and we shall see.

Kevin did they say if the replacement manifold was modified/updated and the old one faulted in some way ?

[dervdave]

My oil burner sounds quieter than that!

Haway mate have some feelings (I thought the same but was ower diplomatic to say it )

[dervdave]

If it was an oil issue I was wondering about trying Castrol Magnetec (which is suppose to protect better during cold starts) to see if it made any difference.

The main dealer used to put it in my rarely used Jag.

[Mistermena]

My oil burner sounds quieter than that!

Haway mate have some feelings (I thought the same but was ower diplomatic to say it )

Lmao! Oops... Me bad :!Removed!:

[dervdave]

Lmao! Oops... Me bad :!Removed!:

Te he he :!Removed!: ;)

[acetip]

If it was an oil issue I was wondering about trying Castrol Magnetec (which is suppose to protect better during cold starts) to see if it made any difference.

The main dealer used to put it in my rarely used Jag.

Castrol protects better?. who says so,Castrol does,well they would.more of the magnetic oil rubbish claims.

[dervdave]

If it was an oil issue I was wondering about trying Castrol Magnetec (which is suppose to protect better during cold starts) to see if it made any difference.

The main dealer used to put it in my rarely used Jag.

Castrol protects better?. who says so,Castrol does,well they would.more of the magnetic oil rubbish claims.

Whoa chill out a bit !

I was only offering up a suggestion.

http://www.halfords.com/webapp/wcs/stores/servlet/product_storeId_10001_catalogId_10151_productId_253905_categoryId_165581_langId_-1?cm_sp=Intelligent_Offer-_-Product_Details_Zone_1-_-Blank&iozone=PDPz1

[Terry953]

Hi Grumps - you've nailed it! Hadn't a clue this could happen so will dismiss the oil theory but also confirm that it affects the Auris as well, whatever it is.

Yep! can confirm I have had this once with my 2010 Auris HSD.

Also confirm it happened after a mini journey of around a mile [not warmed up] last winter when very cold, stood overnight and got the noise next morning on start up.

No apparant damage, and it stopped before I had recovered my composture to even consider switching off !!

TerryB

[Parts-King]

Well Toyota remain quiet on this issue. Some believe it could also be a dodgy manifold valve and some think it's the VVT out of kilter. It could also be oil starvation but if that's the case then it happens in Canada where they still recommend 5k mile service intervals using 5w30 oil!

Parts King, where are ya???

I'm here!

Ive read a few reports on this issue from last winter but I have not seen anything from Toyota about it, mind you, I dont spend too much time looking into service department matters, Ive enough to do with my own job :D:

Kingo

[monya]

I don't think it's temperature dependent - this happened on start up after a month of no use but the weather was warm. However, cant be doing the engine much good for sure. If it happens again will visit Mr. T. Didn't happen at all last winter when it was bl**** cold.

[Jan&tone]

I don't think it's temperature dependent - this happened on start up after a month of no use but the weather was warm. However, cant be doing the engine much good for sure. If it happens again will visit Mr. T. Didn't happen at all last winter when it was bl**** cold.

Isn't it something to do with, say, getting the car out of the garage, or moving it on the drive without the ice starting up, then leaving it a while and when you go back to it the engine starts with an audible noise rather than the smooth, silent and deadly one?

never had it happen to me but others on here have, seems to be impossible to recreate at the dealers to show them which is probably about par for the course too!

[monya]

Not in my case. The car is parked in the road - no drive or garage. Just got in, pressed start and waited, in this instance, for the engine to start, which it did after about 20 secs as usual. A 'rough start' is putting it mildly. Thought it was related to a month of no use - obviously not!

[Jan&tone]

........... pressed start and waited, in this ........

Why? Why wait? Hybrids go whether the engine is running or not!

[monya]

Just being cautious, not having started it for a month. Frankly I'm glad it wasn't rolling when the engine came on - probably would've wet meself