Oil For Mazdaspeed3 2.3 Turbo?

[MCompact]

Originally Posted By: wemay
PM Mcompact, he owned one for quite some time.


I ran a 2007 MS3 from July 2007 to January 2016- a bit over 158k miles. Initially I used M1 5W-30 with a 5k mile OCI, but UOAs indicated a 7.5k mile OCI was fine- if a little conservative. To be safe I switched to M1 5W-30 EP.
The turbo was replaced pursuant to a TSB at around 25k miles, aside from that the engine had virtually no problems.
My last UOA can be found here.
Lots of people have reported fuel dilution as a problem but in my case it was a non-issue.

 

[DoubleWasp]

Wow. Your engine loved that M1.

Given the lengthy documented experience there, I think I'll try the M1 EP.

 

[MCompact]

I will note that my MS3 was basically stock; the only engine modifications were a Mazdaspeed cold air intake and a Hypertech tune. I didn't baby the car but I didn't continually thrash it either.