[FlaK]

10w40 is only "thick" when cold, once its good and warm its fine, and when its nice and hot after being run hard the thermal shear probably drops it closer to 10w30, running 10w40 means the oil has less thermal break down, thus better lubricating/coating at high temps, such as our wankles see, the oem spec 5w20 is simply a mpg move mazda did. that cost the lives of most of these motors early, just trying to get better mileage. Alot of debate towars oil with renesis, ive done alot of reading and i just went with what worked on my past rx7s, from my 12a's, 13b's to this, castrols never let me down.

Mine usually sits in the garage but i run 10w30 and 10w40 depends on the time of year and what im doing. Sohn adaptor is great mod, i just installed it, once this oil is ready for a change, ill be going to synthetic 10w30, cuz as you know shes not sipping on her own life blood lol. then I can do away with oil changes every 4k, bonus.

I got the same BHR mid, and the racing beat catback, great sound.