Originally Posted by navy blue
Ended up getting a brand new BP Oil GF4 10w-30. Think this should be OK, what do u think, it follows the recommendation and conforms to Ford standards.
Since I do very low kms what viscoity range would be the best, as i really sont understand oils that much!!!
The GF4 is a new rating and can only be used with high quality oils, you wont have any problems with what you've picked.
Thinner oil (low viscosity) is the preffered oil for two main reasons;
On start up, the oil pump has to start an oil flow to the top of the engine (cam shafts, valves, etc.), by pushing up hill, so to speak. Low viscosity oil is easier to pull from the sump & push up, so all the engines criticle moving parts get lubed fast.
Fuel economy; low viscosity oil is easier to pump so there is less drag on moving parts, drag (The phenomenon of resistance to motion through a fluid
) robs power, power is produced by fuel . Less drag allows for more of the engines energy to be directed to moving the vehicle, instead of pumping thick oil to the top of the engine.
It has been proven tha most engine wear is caused on start up;
studies have shown that it can take some oils over a minute to get to the valve gear,
the oil filter can be bypassed, on a cold morning a thick oil will meet high resistance to flow through a filter, so the bypass valve is activated & unfiltered oil is used to lubricate.
Oil will become thicker as it gets older, some oils thicken more than others. If you plan on keeping your car for a long time, change the oil more frequently or use a full synthetic & follow fords recommendation of 15,000/12.