Any problems or thoughts on using Mobil 1 brand 0W30 Synthetic oil with advanced fuel economy in an 01 JGC 4.7 Liter in Florida? Just asking because the label sats that it exceeds 5W30 and 10W30 requirements.

Any problems or thoughts on using Mobil 1 brand 0W30 Synthetic oil with advanced fuel economy in an 01 JGC 4.7 Liter in Florida? Just asking because the label sats that it exceeds 5W30 and 10W30 requirements.


Just because an oil exceeds certain requirements doesnt make it suitable for all areas. remember, that "exceeds" statement is in a limited range of conditions, check your driving temperature range and judge from that. The driving temp range isnt engine temp but the climate you will be driving in, this is extremely important on long life synthetic oils, as they tend to be used across several seasons. For example up here in the northern midwest where sub zero winter temperatures are not uncommon in the winter, and summer temps of 100 plus are very common, this is a major issue, too thin and the oil breaks down due to excessive heat in the summer, too thick in the winter, lack of oil flow becomes a major issue and will kill an engine. 5w30 synthetic seems to be the magic grade for all but the most abusive driving conditions, a lot of idiling, city driving, slow speed wheeling, and you should look a bit thicker, depending on engine size and climate again. Also many oils CLAIM to increase gas milage, they CLAIM to do this by reducing friction... well the only place they really would reduce it enough to make a noticable difference is in how easily it is pumped as this is the area where oil makes a demand on horsepower, (the friction part is an obvious crock once you really take this into consideration). This means that the oil is even thinner and flows more like water than oil. The truth about oil is it's PRIMARY purpose is to cool the bearings, lubrication is secondary to that. Pull a crank with bad bearings and you will see that they are discolored from heat... So bottom line use the thickest oil practical for the temps you will be driving in, too thick and it is limited in necessary flow but on a worn enginge there is sufficent slop to allow for thicker oils to flow, but if you go too thin it will thin even more from ambient and engine heat ( higher ambient temps mean less engine cooling via the radiator)... In Florida, I wouldnt go thinner than 5w30 just yet, let someone else take the risks on the newfangled thinner oils and see what their track record is, Mobil1 5w30 has been proven time and again, so you arent at risk there.:2cents: