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I drive a car with a 5.7 Hemi engine - The recommended fuel is midgrade 89 octane. I have noticed the car runs better if I use premium 91 octane fuel. My question - Is there a greater risk of fuel dillution to my 5w-20 oil running 91 vs 89 octane gas. I usually use Castrol Syntec 5w-20.

Just curious - Does 91 octane gas create a hotter explosion than 87 octane? All input is appreciated.

http://blog.modernmechanix.com/mags/PopularScience/6-1939/oil_tank_boat.jpg

Anybody know? The search function on this site is not the greatest - I know this has been asked before, I just cant find it.

http://1.bp.blogspot.com/_WjxBSW9JWRY/SnlnNpsrkgI/AAAAAAAACm0/XHvmiydYEiU/s400/oil_can_01.jpg

http://wolfshead.com/

All right GURUS - What's the difference between SL rated 5w-20 and SM rated 5w-20??? Both oils are synthetic.

These days I find myself at lots of red lights and drive throughs - and I always wonder if idling is good for the engine oil or bad.

Is the Acura HTO-06 a synthetic only spec or are there Dino's that meet it?

I base this question on Cst #s ive seen.

http://i455.photobucket.com/albums/qq279/BluePhantom2008/oil_castrol_edge_0w_30_6_5_.jpg

Would it be O.K. if I mixed 3 quarts of Castrol Syntec 5w-20 with 3 quarts of Castrol GTX 5w-20? Could this cause any lubrication problems?

Anyone know who makes OEM oil filters for Beemers?

Does anyone know if there is a significant difference between these two filters?

Has anyone run Syntec in this weight - and had good UOA results?

The annual mileage would be 8,000mi. But would PP hold up for the 1 year interval? Weight 5W-20

Lets hear some well educated opinions.