oil help

[rx7danny]

searched forum but found nothing
srevice tomorrow got everything except oil and not sure which is best
previous owner said castrol 10 40 just wanted to get it right
regards danny

[RotRex]

Not an expert but the advice from Mazda is it should be mineral. Oilman on the forum probably knows best but I use Mobil Super 1000 X1 15W/40 from Halfrauds. Many people use Halfrauds Own Brand mineral.

[rx7danny]

looked on oppie website and they recomend
5-30 semi synthetic
does this sound correct

[Aubec]

Cheap mineral oil, its barely in the engine before you change it again.