Synthetic Oil?

[H2ummer]

I use Mobile 1. It does in fact come from the factory in some cars, like the Vette. I changed the factory oil in the H3 to Mobile 1 at 500 miles, since I am going to follow the recommended change interval. One thing that is often overlooked is not all oil filters are rated beyond 3000 miles which has be the standard interval. Use either the factory filter or an aftermarket filter that has been rated for extended intervals.

[Maui Nick]

Synthetic oil=cooler engine, better mileage, longer engine life.

[H2ummer]

Oh and don't forget to reset the Oil Percentage on the DIC.

[f5fstop]

GM's testing on this engine does not require the use of synthetic oil. It won't hurt, but not necessary. As far as temp decreases, it is minimal, and remember, for efficiency, the engine must be running at a certain temp. The true advantage of syn oil is in extreme hot conditions (resistance to breakdown) and extreme cold conditions (flows at extreme cold temps).
If you want to find out how well non-syn oil is doing, send a sample for an oil analysis and see how the TBN is, to check the true oil life remaining.
For some people, using syn oil is similar to burning premium fuel.

[usetosellhummer]

Plain and simple, it won't hurt but you are the only one who can justify the cost. It is not a need.

[f5fstop]

Originally Posted by usetosellhummer

Plain and simple, it won't hurt but you are the only one who can justify the cost. It is not a need.

Exactly....

[BlueHUMMERH2]

I just put syn in my H2 at about 60K, and I think the engine runs much more smoothly. Just my opinion however.

[H3PAC]

Thanks guys...exactly what I was looking for.

[deserth3]

I switched to Mobil 1 EP at 3000. Haven't noticed any change in the engine or milage. But I do run offroad in 100+ deg temp in Utah.
I like the idea of not having to change the oil every other month.
Mobil 1 EP advertises it's good for 15000 miles or one year. I'll change it at 10k because of offoading. Maybe less depending on what the oil looks like.
You can probubly put it in and follow the computers recomended change without any problems. As one mechanic told me. The computers set to calculate for a moderate climate, no off road use, and normal driving.