I just dropped a jdm s5 turbo II in my 90 gxl, i have a 3 in down pipe hks blow off intake and few lil mods, what is the best oil to run?

 

This has been discussed

ONE MILLION TIMES

 

^and thats an exact number

 

see sig.

 

if you want to know. the best is conventional oil, synthetic=RIP rotarys

 

except for royal purple and the good stuff... and/or any synthetic is good if ur runnin premix

 

not running pre mix. i thought synthetic was no good for rotary seals?

 

ok i looked it up on the FAQ. im a noobie sorry

 

Synthetic tends not to burn as well as conventional oil, because it is sprayed into the combustion chamber this is bad. However, premium synthetics (read mobil 1 or better) are perfectly fine for the rotary. Mazda Race teams use synthetics in their engines.

However, a simple search will get you all of the other threads explaining this.

 

iono about that royal purple stuff... but you can run it if you like. heard a lot of pros and cons about it. good luck though

 

Really, all myou need is good conventional oil. I have been running Castrol GTX 20W-50 with great success, as have countless other people.

 

same here, either GTX 20W-50 or valvoline 20W-50, whichever is cheaper at the time

 

Got to add:
Shell Rotella T 15-40-Take a look at the specs.

 

ya, that's a diesel oil, right? I run castrol gtx 10w30, does the job

 

Been running Castrol GTX 20W-50 without any issues here. I even premix 1/2oz to 1/4oz per gal just to keep on the safe side.