Right, 2 of my "dots" have become empty on my oil display... I know people say use 5w40 in the 172s, but will 0w40 be ok to top it up?
Reason i ask is because last time i was in the local motorsport shop they had some leaking bottles of http://www.castrol.com/liveassets/bp_internet/castrol/castrol_germany/STAGING/local_assets/images/products/rs0w_new_castrol_de_106x253.jpgTHIS STUFF in 0w-40 reduced to £2 so i bought some.
so will that 0w40 be ok to top up with?