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DAnDan said:
But extra fuel economy without sacrificing something else is surely a win win situation. Free money basically!
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Dr Who said:
Well to some people fuel economy isn't the most important reason for buying a car, so each to their own, they are hardly comparable to B&W TV.
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Its called advancing technology. Obviously you missed the link. The winner here is not the driver (although they can gain from lower car tax )

Low viscosity oils is the easiest way for OEMs to reduce emissions of vehicles. This is important due to EU legislation and fleet CO2 averages. OEMs will be fined per vehicle per g over the Co2 limit.

By 2015 this will be €95/car/g. I'm sure you can appreciate, this is mega money hence to drive for downsized engines, stop start, hybrids etc. Low viscosity is a cheap win for the OEMs. However to enable this oil technology and fundamental understanding has moved on. Engines are now developed with the oil. No longer is it the case of choosing oils for oils after they are developed.

I spend millions each year running test program's to develop and test oils, I also travel to OEMs to discuss program's, engines and future hardware.
It's not all the same stuff. However I understand it really is difficult to convey exactly what is involved. I know it amazes everyone who visits our technology centre.
 
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Dr Who said:
If I wanted free money I would map my car for 95ron not 97ron.
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Do you get paid to map your car then ?

I think you are completely missing the point here. Maybe it's on purpose but I feel you ate ignoring most points and just picking out ones to disagree with.
 
Yeah
Muffin` said:
Yeah B18C in the DC2
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Brand new rebuild engine I would use Edge turbo diesel 5W-40 and then follow the run in procedure. If you want to run it in for 100 miles on something like a 10W this could be done along with a filter change then they shouldnt be any harm, it's just good practice to ensure the engine is clean inside ( flushes out any swarf/dust/build grease etc
 
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It has been an opinion in the engine builder community that full synth is too good a lubricant to use when running in.

I have used full synth oil to run in engines since my early days of motocross, and well into running in race bike engines and high performance cars, and never had any issues that I know of.

The extra detergents in diesel motor oil would likely do a good job of cleaning the inside as well, so your recommendation makes sense, or maybe I am missing another point again...
 
Dr Who said:
It has been an opinion in the engine builder community that full synth is too good a lubricant to use when running in.
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Synthetic oil + gentle running in has certainly caused bore glazing problems in the past with some engines. When I worked for my grandfather at his Lamborghini tractor dealership, quite a few very new tractors had to be stripped down and the bores glaze busted and new piston rings fitted due to a significant loss of compression and high oil consumption. The Lamborghini factory specified a particular running in oil had to be used on all new engines from that point.

That was quite a long time ago however, I'd hope that engine and oil manufacturers have fixed this by now.
 
My understanding of it while running is was that too high a 'quality' oil caused more polishing then desired and led to high oil consumption as you want very fine scratches to keep hold of the oil.
 
Use the correct spec for the car, unless it's a $300 shed. or you live in Alaska or the Sahara, then to may want to look into a different grade.

I'm sure they would be happy to Exchange it if its unopened.

I don't see what the big deal is.
 
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