GR Yaris Oil grade

Michael Knight said:
interesting - is Ravenol better than the oil Toyota uses?
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That's a difficult question to give a straight yes or no answer to.

There are a small number of Toyota dealers that use the correct spec engine oil for the GR Yaris. The factory recommends 0W-20 GF-6A fully synthetic. It's on the engine oil cap for all to see, so no excuse for a Toyota dealer to not use the correct spec engine oil. As said, a small number of Toyota dealers understand the importance, and use the correct spec. Unfortunately, this also means the majority of UK Toyota dealers aren't. A 0W-20 oil is only part of an oil spec requirement, this refers to oil viscosity, not the actual engine oil specification. The GF-6A refers to the engine oil specification. Oil manufacturers use additives to affect formulas and to achieve industry standards specification. In the situation of GR Yaris, Toyota state the G16E-GTS engine should use a GF-6A spec. This contains an additive which helps LSPI low speed pre ignition events. Pre ignition events have a serious detrimental effect on an engine. So, if the engine manufacturer states GF-6A spec should be used, that's what I use.

So, is Ravenol USVO 0W-20 GF-6A better than what UK Toyota dealers are putting in GR Yaris engines - Given the fact a very large percentage of dealers are not using a GF-6A spec oil, the answer to this specific situation is yes, because these dealers are using a sub spec engine oil.

Then there are the UK Toyota dealers that are using a 0W-20 GF-6A spec engine oil (I have supplied my local Toyota dealer with Ravenol GF-6A for example). I am also aware that some now use a Toyota branded GF-6A, but what I don't know is which oil manufacturer produces this for Toyota. My advice, ask for exact confirmation of what viscosity and specification oil your chosen service centre intend to put in your engine.

Then there is the various performance data between one 0W-20 GF-6A engine oil and another, from one manufacturer to another. Just because the viscosity and spec are the same on the label, this doesn't mean they will give the same performance. As an example, Ravenol uses their USVO lubricant technology, ultra strong viscosity oil. A factor I pay particular attention too when deciding on oil use. Most GR Yaris will be driven to enjoy, and that will probably mean the engine will be pushed hard at times. It's also a great track day car, and engine oil performance at high temps becomes even more critical. One of the worst impacting effects on engine oil is high peak temps. High temps cause engine oil to degrade quicker than lower oil temps. A more shear stable will degrade slower. Ravenol has proven to be excellent in this respect, and this is a major factor in my decision to use and recommend Ravenol.
 
For clarity, the engine oil cap mentions RC alongside API SP.

GR Yaris - Dealer Service - Oil Query

This thread has set me off thinking and I now reckon I've been given the wrong stuff at the 1st service back in December. The invoice quotes T08880-83886 TGMO 0W20 AFE 5 which looks to be a GF-5 product. This morning I sent an online enquiry to Toyota Parts Direct simply asking what is the...
www.gr-zoo.com www.gr-zoo.com
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I understand RC to stand for Resource Conserving, not to be confused with the earlier "Energy Conserving".
www.gr-yaris.co.uk

Correct bulk oil at the dealer

Ahead of my service and in case anyone is interested..... After a lot of calls and confused people I managed to get confirmation that the latest Toyota bulk (208 litre) drums of 0w-20 oil now meet the spec for the GR. I even got the service manager to send me a picture of the barrel for good...
www.gr-yaris.co.uk www.gr-yaris.co.uk
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It's been approximately three years since the first GRYs left UK dealerships and I am yet to come across a Toyota branded oil container available through UK Toyota dealers that mentions both API SP and Resource Conserving.

The Ravenol oil I use comes in containers that mention both.
 
My country never have freezing winter
And I track my car a lot
So I use 5/50 from day 1
 

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Note: I'm not saying not to run #40 (example) oil in the G16E. I don't have the data to support what #40 oil does and doesn't do to the engine. Only that there are other considerations besides LSPI.

If you don't increase the pressure by changing the opening point of the pump bypass, you get a bump in pressure because the oil restrictions (bearings, etc.) haven't changed, but the oil is thicker, so more has to bypass, meaning it has to open the bypass valve more (higher spring pressure). You're technically moving the same amount of oil, but the pressure increase from viscosity isn't enough to move the same-as-lower-viscosity-volume through the critical spaces, like bearing surfaces and...piston cooling jets... More is simply going back to the sump through the bypass.

Advantage: Higher shear protection due to increased viscosity. Bypassed oil increase feeds the pump inlet for reduced cavitation.

Disadvantage: Less oil flow to where it's used and therefore less heat removal. Additionally, in a hydraulic system, heat isn't generated by pressurization (like air), but by friction (thicker oil=more friction) and pressurized oil flowing to an area of low pressure without doing mechanical work (the bypass).

Action/Reaction. It's always been interesting to watch people arbitrarily pick an oil viscosity for an engine with stock oil burden without consideration for the negative effects; these negatives being especially important in today's high specific-output engines.

For the stock-engine daily car that's driven hard on winding, and where oil temp goes north of 100°C, it's my opinion (based on 30+ years of building high power Japanese engines), people would be better served by working to keep the oil at 100°C before changing viscosity from what the OEM specifies.

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