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Jan 27, 2007 | 01:13 AM

#11

hythe

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From: London, UK

My Ride: 2005 BMW-Alpina B5 Touring #007, Malachite Green w/ Caramel Individual interior 1999 BMW 840Ci Sport Individual, Techno Violet w/ Champagne Individual interior

Quote:

Originally Posted by aybeesea' post='383972' date='Jan 27 2007, 07:11 AM

Shell would claim it's a new formulation.

http://www.shell.com/home/Framework?siteId...roduction.html/

ABC

It definitely is new - the RON rating is 1 higher, and it seems to cause some initial idle roughness on cold starting in some cars, though this sorts itself out after a few seconds. I suspect it contains some ethanol.

Jan 27, 2007 | 01:37 AM

#12

aybeesea

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From: UK

Quote:

Originally Posted by hythe' post='384005' date='Jan 27 2007, 10:13 AM

I suspect it contains some ethanol.

If you are right (which I don't understand because you say the RON has increased by one) shouldn't it be called De-Power?

Maybe the initial rough running is the detergent giving the engine a good scrubbing?

I've never understood the use of detergents in such an environment.

ABC