best synthetic oil and m/t oil??

[CASTREX]

Originally Posted by 07WYarisRS

You can order Amsoil online or I can put you in touch with my Amsoil guy and either he can ship it to you or know of someone or another place to order Amsoil from. Redline is also An excellent lubricant. Royal purple is decent but has had quality control issues in the past that I have seen first had with lab test results. Things like high copper levels, water and even grades being off. I would stick with Amsoil or Redline.
The rest like Mobil 1, Castrol Syntec, Motul, Qstate, pennzoil synthetics etc are all just highly refined crude/mineral based oil. IMO not worth the prices they charge

A 0w-30 wont hurt in any temp however if you live in a tropical climate a 5w-30 is all you really need. Stick with the 30W oils, 20W oils are super light. While they can help mileage ever so slightly too light of an engine oil on a car under heavy load orextremem temps or high rpm operation can shorten the life of the engine.

I'm from Costa Rica and we don't have Amsoil or red line oils.
These are the brands represented here:

Penzoil
Castrol
Shell
Mobil
ELF
Qstate


Do you have any experience with any of those brands? Which one would you recomend?