Bosch oil filters are crap--here are dissected Bosch and OEM Miata filters I cut up a few years back--however the difference in actual filter element size is startling:
Upon installing the Bosch filter I lost 12 to 15 psi pressure at the o/p gauge (I.e. the main oil galley just after the filter).
Also-- and this is pure IMHO
that I do not care to argue--I would not use 5W-20 oil in a go-kart if I lived in Nome. Put some 10W-30 or 10W-40 in there--read more about 5W-20 here
-cliff knight- SOLD! July 2013
- 2003 GT, UPR X, 24lb/h injectors, Magnaflow, 180° stat,
PP 70mm TB & plenum, Ralco RZ_flywheel, RAM HDX clutch, 3.73s, 262 rwHP/305 lb-ft.
new ride - 1998 SL500, 5.0L 32V 326/347 HP/tq