3rz Oil grades

[BryanW]

Good day chaps, What engine oil grade do you use in a 3rz-fe? I am running 5w40 syn. We have harsh climates +/- 40deg C at times. I have noted impressive gains on a friends 3rz with 5w30 syn in terms of fuel consumption.

Are there in any negatives to running a 5w30 syn? is it within spec? Toyota SA specs say a 10w30 is in spec but a 5-w30 is for temps only up to 14deg C. From what I gather most engines are using 5w30 now or does it depend from engine to engine?

My only concern is when I go up to Namibia and the temp hits 45deg C/115F, I dont want to damage here and I dont want to compromise engine reliability.

Thanks

 

[bar1]

I would continue to use syn 5W-40. That extra fuel consumption is cheap engine insurance..
If you want to go "a little thinner" choose an oil that has ACEA A3 (HTHS@150C > 3.5), examples are M1 0W-40 or Castrol SLX (Syntec) 0W-30.

 

[Titan]

I'd personally go with the thinnest oil that meets the tougher specifications. I do not think that 115 degrees ambient temp is "harder" on an engine that 75 degree temps...assuming an intact, well designed, fully functioning cooling system on the vehicle.

 

[427Z06]

BryanW, what oils (brands/grades/certifications) do you have available to you?

 

[BryanW]

Most of chevron products. Caltex Havoline Fully Synthetics/ Havoline energy 5w30 synthetic. Castrol edge syn 5-w30 and 5w40.

 

[BryanW]

The one I would likely use is Havoline Energy 5-w30

Self certified ACEA: A1-98 and B1-98
Licensed API: SJ/EC
FORD WSS-M2C912-A1
ILSAC GF-2

 

[BryanW]

ACEA A3 (HTHS@150C > 3.5) sorry to be a pain could you please explain the above and why you recommend it.

Thanks

 

[bar1]

http://theoildrop.server101.com/cgi/ultimatebb.cgi?ubb=get_topic;f=21;t=000045

 

[427Z06]

BryanW, can you get Castrol Formula SLX LongTec 0w30? It would be a good compromise between the Havoline Energy 5w30 synthetic and the syn 5w40 you're using.

 

[BryanW]

I think we do have it. Might be hard to find though..

Key benefits
Castrol Formula SLX Longtec provides performance reserves and longer lasting technology demonstrating:

* Superior sludge control

* Excellent deposit control offering enhanced engine cleanliness

* Improved engine durability

* 'Stay in grade' capability and viscosity control

Specifications

* ACEA A3/B3/B4

* API SL/CF

* MB 229.3, 229.5

* GM-LL-A-025, GM-LL-B-025

* VW 502 00/503 01/505 00

Is this a better rated oil than the Havoline Energy?

 

[BryanW]

Thanks for the info. Finally grasping all the HTHS tech. What classifies it as good? Over 3.5? I think I might have a look around around for the Castrol, If i cant I will stick to the Caltex 5w40.

Apprecaite all the help.


Regards
Bryan

 

[427Z06]

The key differences is that it has the ACEA A3/B3 rating with a HTHS of 3.5 and has a viscosity of ~12 cSt at 100°C compared to the ~15 cSt at 100°C of the 5w40. This should improve your fuel economy a little while insuring you have all the protection you need for any circumstance.

 

[427Z06]

quote:

---

Originally posted by BryanW:
What classifies it as good? Over 3.5?

---

Not necessarily, it depends on the application. Castrol Formula SLX LongTec 0w30 has demonstrated excellent performance irregardless of it's HTHS, covers Toyota recommendations, and should provide a slight increase in fuel efficiency due to it's comparative viscometrics to what you're currently using.