FA20 Engine Oiling, Bearings, and Starvation

[texasbound972]

Originally Posted by Element Tuning

Wrong. You use the oil viscosity required for whatever conditions the engine is being used in or used for. If you have a stock engine, oem power, and the car is daily driven then by all means use the factory recommend oil.

If you have triple the oem power and you run your oil at 280 degrees under track conditions, you do not use the oem oil viscosity.

Crawford has me running 0W40 for their built block. A guy I know that's a Toyota mechanic says that 5w30 is better. It's a never ending argument lol.

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[Matt@Cosworth]

the cars' handbook actually recommends 5W30 for heavy / hot climate use and 0W20 for everything else

[dp1]

I have been using Motul 300V 5w30 for track/ax in warm NE months. JRSC with JR oil cooler, delicious tune, lower fan temp 28k miles and over 40 track/ax days. Just noticed I have 4l worth of 0w40 300V that was sent by mistake as part of the 5w30 batch - is it ok to mix 5w30 and 0w40?

[Bykov]

Originally Posted by dp1

I have been using Motul 300V 5w30 for track/ax in warm NE months. JRSC with JR oil cooler, delicious tune, lower fan temp 28k miles and over 40 track/ax days. Just noticed I have 4l worth of 0w40 300V that was sent by mistake as part of the 5w30 batch - is it ok to mix 5w30 and 0w40?

Savagegeese had a good explanation on this. The answer is probably but check out his video to see how it applies to you.


An engineer from Mobil 1 once said motor oils are designed keeping in mind some people may decide to mix oils and they account for that. But that's mobil 1 not Motul.


PS I would link the video but YouTube is blocked.

[ajc209]

Whilst we are talking about oil viscosity, some might be interested the Toyota Motorsport GT86 race car runs on 10W60 race oil and has an optional oil cooler.

It does have a low temp thermostat which does help lower oil temp a little bit, but other than a remap and exhaust system its a stock FA20 engine.

TMG won multiple world rally championships back in the 90s with the Celica and currently build the Toyota Le Mans cars so I reckon they know a thing or two....

I wouldn't use that on the street though. 0W20 gives a nice 70-80psi @7krpms at @212F. Its only when things get hotter on the track that pressures starts to get a little low and a W30 or W40 oil might be useful.

If it a street and track car then there will always be a compromise between very high pressure on the street and acceptable pressure on the track.

[TRAKRAVN]

I run 0w-50 in the car (car is summer use only) and I just let it warm up a bit before driving. Even with an oil cooler the temps will still climb and when they do that's when the extra pressure from the thicker oil makes a difference. As far as one oil being better for you than someone else is all application based. If you baby the car all the time and drive year round 0w-20 is perfect. Same thing like your body, if you work out and play sports you need more food then someone who is sitting around. Think of oil in the same way, thicker oil for those that are working hard.

[dp1]

Another private answer I got from a trusted source is that I can mix Motul 300V 5w30 and 0w40 oils on a tracked car, with some hit on gas mileage with w40. Thank you all

[texasbound972]

Originally Posted by dp1

Another private answer I got from a trusted source is that I can mix Motul 300V 5w30 and 0w40 oils on a tracked car, with some hit on gas mileage with w40. Thank you all

So you're saying that 0w40 gives you worse gas mileage than 5w30?

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[dp1]

Originally Posted by texasbound972

So you're saying that 0w40 gives you worse gas mileage than 5w30?

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Not my words but I clearly interpreted the comment that way

[Calum]

Originally Posted by dp1

Another private answer I got from a trusted source is that I can mix Motul 300V 5w30 and 0w40 oils on a tracked car, with some hit on gas mileage with w40. Thank you all

0w40 is often nothing but marketing, SAE J300 states that they can have the same viscosity and shear rate at engine operating temperatures. The range of viscosities that are allowed to be labeled as 0w40 can be more viscous than oils labeled as 5w30, but they don't need to be. I highly doubt you would ever be able to measure a mileage difference between the two in a real world test.

http://www.viscopedia.com/viscosity-...cosity-grades/

[Calum]

Originally Posted by texasbound972

So you're saying that 0w40 gives you worse gas mileage than 5w30?

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The higher number should indicate a more viscous oil, which would cause the engine to work harder to pump the oil. But the differences at operating temperatures are often negligible, if they exist at all.

[ajc209]

It definitely does exist and its one of the reason our car runs such a low pressure; fuel economy.

Bare in mind a thicker oil will generate a bit more heat too. The extra energy used to pump the thicker oil round has to go somewhere.

[Calum]

Originally Posted by ajc209

It definitely does exist and its one of the reason our car runs such a low pressure; fuel economy.

Bare in mind a thicker oil will generate a bit more heat too. The extra energy used to pump the thicker oil round has to go somewhere.

If you're comparing 0w40 to 5w30, than I disagree, for the reasons I stated above. If you're comparing 0w20 to either of the other two, that I'll agree with. Though the difference isn't going to be anything huge, I'd estimate a percentage or two for highway driving.

[derek1ee]

This may be totally off the topic, but I'm curious what this is?