Originally Posted By: alarmguy
No engine, not just Mazda would care if it was 0/20 or 5/20 or 5/30.
Mostly true, except for some Hemi 5.7 engines, with cylinder deactivation... Those will even start acting up if you simply use a "thick" 0w20/5w20. That is according to Hemi forums. Never had one myself, yet.