5w-20 motor oil : who's using it ? ...

[TheSilkySmooth]

Originally Posted by SilverGlow

A lot of people that don't understand how oil works think this.

Thinner oil means faster circulation at start up. Faster circulation to the farthest reaches of an engine means less wear. And it is at start up that 90% of engine wear happens. At full operational speeds, the protection that w20 provides is nearly identical to most 30 weights.

This is an oversimplification on your part. The oil must provide adequate viscosity for the running clearance of the engine design - most critical are the journal clearance and piston to wall clearance. If you run an inadequate viscosity you will easily have catastrophic engine failure. As for margin lube contact wear in cam lobe-to-tappet face, piston top-to- bore, crank flange to journal thrust cap, and unfortunately add for our engines; timing chain sprocket to guide and chain to sprocket. Proper lubrication here relies all on the polar nature of the base oil (most popular syn are NOT polar) and the metal salt extreme pressure additives in the oil. Without them you WILL have premature wear no matter how good your base oil is (Good as in Motul, Redline, Fuchs, ELF NOT Mobil, Pennzoil, BP!) If toyota specs 30w and 20W they are really flirting with disaster. The motor MUST be clearanced for one or the other. Guaranteed we will see a high percentage of spun bearings and collapsed piston skirts with this misguided TSB policy on our 1nzfe engine.

Sonja's Dad

[SilverGlow]

Originally Posted by TheSilkySmooth

This is an oversimplification on your part. The oil must provide adequate viscosity for the running clearance of the engine design - most critical are the journal clearance and piston to wall clearance. If you run an inadequate viscosity you will easily have catastrophic engine failure. As for margin lube contact wear in cam lobe-to-tappet face, piston top-to- bore, crank flange to journal thrust cap, and unfortunately add for our engines; timing chain sprocket to guide and chain to sprocket. Proper lubrication here relies all on the polar nature of the base oil (most popular syn are NOT polar) and the metal salt extreme pressure additives in the oil. Without them you WILL have premature wear no matter how good your base oil is (Good as in Motul, Redline, Fuchs, ELF NOT Mobil, Pennzoil, BP!) If toyota specs 30w and 20W they are really flirting with disaster. The motor MUST be clearanced for one or the other. Guaranteed we will see a high percentage of spun bearings and collapsed piston skirts with this misguided TSB policy on our 1nzfe engine.

Sonja's Dad

But your write up does not apply to this discussion.

You know why?

You are the one that is over-simplifying this issue. Why then do many UOA reports (Used Oil Analysis) show that using 20 weight oil does not in fact show more wear and tear?

Because Toyota has back-spec'd our cars for 20 weight oil, and if it would cause engine failure, then why would they invite millions of in-warranty repairs by publising the TSB, which states we all can use 20 weight in our cars.

And you know more then Toyota engineers? Why would Toyota willfully dirty their reputation and name by telling us to use 20 weight oil if it will cause enginen damage? Please.....

The only way what that what you write is true is if someone uses 20 weight on a engine THAT IS NOT SPEC'D FOR 20w oil.

This is not the case with our Yaris 1.5L engines.

[1stToyota]

Originally Posted by SilverGlow

But your write up does not apply to this discussion.

You know why?

You are the one that is over-simplifying this issue. Why then do many UOA reports (Used Oil Analysis) show that using 20 weight oil does not in fact show more wear and tear?

Because Toyota has back-spec'd our cars for 20 weight oil, and if it would cause engine failure, then why would they invite millions of in-warranty repairs by publising the TSB, which states we all can use 20 weight in our cars.

And you know more then Toyota engineers? Why would Toyota willfully dirty their reputation and name by telling us to use 20 weight oil if it will cause enginen damage? Please.....

The only way what that what you write is true is if someone uses 20 weight on a engine THAT IS NOT SPEC'D FOR 20w oil.

This is not the case with our Yaris 1.5L engines.

You're not still using the 0w-20 that is not SPEC'D for our Yaris 1.5L, are you, just because you found that viscosity listed in that Toyota TSB that you found...if you read it clearly the 0w20 is for the 1.8L, not the Yaris 1.5L
The engine damage isn't a fair trade for a little extra mpg.

5w-20 yes, 0w-20 no

[SilverGlow]

Originally Posted by 1stToyota

You're not still using the 0w-20 that is not SPEC'D for our Yaris 1.5L, are you, just because you found that viscosity listed in that Toyota TSB that you found...if you read it clearly the 0w20 is for the 1.8L, not the Yaris 1.5L
The engine damage isn't a fair trade for a little extra mpg.

5w-20 yes, 0w-20 no

Read the web sites of Mobil1, Pennzoil Platinum, and all the major brands that make 20 weight oil, and even read the labels on their bottles:

"0w-20 wieght oils can be used in any application that calls for 5W-20 weight".

At operational temperature, BOTH 0w-20 and 5w-20 provide the EXACT SAME viscosity. How come you don't understand this?

And where is the engine damage you write of when using 0w-20? MANY UOA's show there is no more wear then if 5w-20 were used.

It seems you have the habit of talking out your a$$. ;-)

[1stToyota]

Originally Posted by SilverGlow

Read the web sites of Mobil1, Pennzoil Platinum, and all the major brands that make 20 weight oil, and even read the labels on their bottles:

"0w-20 wieght oils can be used in any application that calls for 5W-20 weight".

At operational temperature, BOTH 0w-20 and 5w-20 provide the EXACT SAME viscosity. How come you don't understand this?

And where is the engine damage you write of when using 0w-20? MANY UOA's show there is no more wear then if 5w-20 were used.

It seems you have the habit of talking out your a$$. ;-)

Luser, what part of the Toyota TSB do you not understand? It states do NOT use 0w-20 in the 1.5L

And check these oil threads over the last day or two, I read today where a Yaris owner switched from 5w-30 to just 5w-20 and got back a UOA that had extra wear metals.

Don't know why you keep pretending that what applies to the XD 1.8L applies to your Yaris 1.5L when Toyota's TSB specifically forbids 0w-20 in the Yaris engine...yeah, southern Ca sees lots of really frigid mornings, better use that 0w-20 eventho' the TSB says not to.