Back spec. to 5W20

[lexus114]

If your vehicle was back spec. to 5W20. And all the car ever had was 5W30 (Synthetic and Conventional). Would you start with 5W20 conventional, or go right for the Synthetic?

 

[dparm]

You can absolutely go straight to synthetic 5w20. The myth between the "switch" is mostly unfounded these days.

 

[lexus114]

Thanks dparm. I have 1 jug of pyb 5W20 in my stash I thought I`d try first, hence my question.

 

[hypervish]

The 1mz-fe in the RX300 is back spec-ed as well, but I don't think it's a good idea to put a 20 weight in the 1mz-fe. It shears the oil down way too quickly.

But, as for your case, I think you'll be fine going straight to synthetic for W20.

 

[lexus114]

Originally Posted By: hypervish
The 1mz-fe in the RX300 is back spec-ed as well, but I don't think it's a good idea to put a 20 weight in the 1mz-fe. It shears the oil down way too quickly.

But, as for your case, I think you'll be fine going straight to synthetic for W20.



Well my thinking in all of this is most 5W30`s eventually shear to a 20 weight anyway right? So I dont think it will matter much. I just want to see how it runs, responds, and if mpg`s are any different at all. Probably wont see much of a difference I guess.

 

[hypervish]

Let me know, if you see any changes in the way it runs.

 

[lexus114]

Originally Posted By: hypervish
Let me know, if you see any changes in the way it runs.



Will do.

 

[mechtech2]

Conventional - dino.
I quit using full synths in engines.

 

[dave1251]

Use PYB with confidence! I would not worry about 5W-20's shearing because it is already a 20WT it will not shear.

 

[lexus114]

Thanks for the replies guy`s.