I know that is a topic from the paleolithic. But I want to make some questions and reflections.
Ford recomended the 75w140 for our mustangs, but I read that in 2015 mustangs, the recomendation is 80w90 (or 75w90 not remember).
I have read several post in forums, and the pros of 140 grade vs 90 are: less noise, better protection on track and towing because the hight temperature reached
However, 90 grade pros are: better fuel economy and HP (1-2%), less friction loss and less temperature at the same velocity which is good for the bearings.
I measured the temperature of the differential at 25ºC (50-70mph) and was 150ºF (65ºC) with the original oil.
In this paper(only abstract and 5 pages availables) the autors compare Ford 75w140 oil with others 75w90 and 75w140 oils.
Fuel Economy Improvement Through Frictional Loss Reduction in Light Duty Truck Rear Axle
Some conclusions are that the composition(syntetic or not) of the oils and their additives are more or as importants as the viscosity grade when considering fuel economy, axle temperature and axle efficiency.
In advance, when a 75w140 oil with high VI (190) and low viscosity at 40ºC is tested the resuls are comparables to others 75w90 and better than the 75w140 oil of lower VI and higher viscosity at 40ºC
Do you think that is possible to use an 75w90 oil in street drive and ocasional sport drive withouth issues in a Mustang? otherwise, any 75w140 quality oil? Here in Europe Motul, Castrol or Ravenol are options that I am rewiewing. Some sugesstions?
One doubt. One oil of a famous brand that affirm that is syntetic, has a pour point of -36ºC...is this possible or can be an error in the tech doc?. Other oils that are PAO based with the same viscosity grade are -45º to -50 ºC (pour point)
Thanks
Ford recomended the 75w140 for our mustangs, but I read that in 2015 mustangs, the recomendation is 80w90 (or 75w90 not remember).
I have read several post in forums, and the pros of 140 grade vs 90 are: less noise, better protection on track and towing because the hight temperature reached
However, 90 grade pros are: better fuel economy and HP (1-2%), less friction loss and less temperature at the same velocity which is good for the bearings.
I measured the temperature of the differential at 25ºC (50-70mph) and was 150ºF (65ºC) with the original oil.
In this paper(only abstract and 5 pages availables) the autors compare Ford 75w140 oil with others 75w90 and 75w140 oils.
Fuel Economy Improvement Through Frictional Loss Reduction in Light Duty Truck Rear Axle
Some conclusions are that the composition(syntetic or not) of the oils and their additives are more or as importants as the viscosity grade when considering fuel economy, axle temperature and axle efficiency.
In advance, when a 75w140 oil with high VI (190) and low viscosity at 40ºC is tested the resuls are comparables to others 75w90 and better than the 75w140 oil of lower VI and higher viscosity at 40ºC
Do you think that is possible to use an 75w90 oil in street drive and ocasional sport drive withouth issues in a Mustang? otherwise, any 75w140 quality oil? Here in Europe Motul, Castrol or Ravenol are options that I am rewiewing. Some sugesstions?
One doubt. One oil of a famous brand that affirm that is syntetic, has a pour point of -36ºC...is this possible or can be an error in the tech doc?. Other oils that are PAO based with the same viscosity grade are -45º to -50 ºC (pour point)
Thanks