Pour points/flash points.

[aquariuscsm]

I was just on Mobil`s website looking at the material data sheets for their oils. The flash points of both their High Mileage oils are higher than that of the silver cap 15W50 and of course the pour points are way lower. I definitely understand the pour points,but what exactly does flash point have on an oil`s performance?

My Z`s engine is still super tight (car has only 59k miles) and I`m living very close to my job now. Car doesn`t even get completely warmed up when I reach my job`s parking lot (my engine has always run super cool anyway). So I`m thinking of dropping back down to a thinner oil. The M1`s HM 10W30 and 10W40 are what I`m considering. I keep hearing that they`re superior to the regular M1 formulations.

What do the oil experts here say?

 

[FZ1]

The hm has seal conditioners in it and is not preferable for your car description. Get the regular M1 or the Mobil 1 Extended Performance.

 

[mechtech2]

The only place that oil can get that hot is in the combustion chamber. There is a greater possibility of ash and other deposits on the rings , lands, and other parts with a low flash point oil.
It doesn't seem to be a problem with any decent oil, so I wouldn't worry about it.
You will like the increased pep the engine will have with a thinner oil.

 

[Curious Kid]

A bit OT -
I also noted the lower HTHS value for the Mobil 1 15w-50, which IIRC was over 5 prior to the EP thing. Info spec.s given also vary so one might have pour point while the other lists "MRV" ratings (cold start visc. for winter rating), etc. on the PDS. Also the lack of zinc/phos. additive % by weight on their MSDS's. Phos. is sometimes given on PDS....I know, I know.

Take care.