Bilby
New Member
I have been using 10W30 G4 shell Helix, is it okay to change to 5W30 and is it better for the engine? Also, it cost about $45 for a 5 litre can, on the other hand the Valvoline "Engine armor" with the same specification as the shell Helix, cost about $40 for a 6 litre can, does it make any difference which brand I use, as long as the specification are the same? Thanks.