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Chas Occasional Poster Registered: March 2004	Re: Run-in (or break-in) method Thu, 01 April 2004 07:36 because most monogrades have a steeper gradient (low VI). For instance 20W/50 will obviously have the same viscousity @ 100°C as SAE50, but whereas the SAE50 is around 50 @ 0°C, the 20W/50 will be around 20. Extend that to actual oil temps and the viscousity of the SAE50 is buggerall, while the multigrade polymer oil is hanging around 7 on the scale. Now transpose that to a lower viscousity monograde and you find the viscousity is practically zip before even approaching engine temp. Now consider your new rings need good lubrication to both lessen localised friction and to carry heat away from the abrasion thats going on. The oil needs to get up under the piston crown to trasfer heat. On a cold engine with relatively high viscosity monograde the oil will not circulate well (slingers and pump) and thus not lubricate nor get to the heat transfer spots. It will also clag under the rings, localise heat (result = coking) and restrict the dissolution of particles. Of course the lower the multigrade rating the more likely you will break or unwind the polymer chains. This is why high VI oils like synthetic are good, because they don't generally require polymer additives. So mongrades can leave you without any worthwhile lubrication if its a low rating (hot engine) and similarly if its a high rating (cold engine). [Updated on: Thu, 01 April 2004 07:44] [Report message to a moderator]

	Subject	Poster	Date
	Run-in (or break-in) method	RAV-GT4	Mon, 29 March 2004 14:20
	Re: Run-in (or break-in) method	thechuckster	Tue, 30 March 2004 02:58
	Re: Run-in (or break-in) method	RAV-GT4	Tue, 30 March 2004 14:05
	Re: Run-in (or break-in) method	ed_ma61	Wed, 31 March 2004 06:31
	Re: Run-in (or break-in) method	Chas	Wed, 31 March 2004 08:17
	Re: Run-in (or break-in) method	RAV-GT4	Wed, 31 March 2004 11:19
	Re: Run-in (or break-in) method	ed_ma61	Tue, 30 March 2004 03:07
	Re: Run-in (or break-in) method	ae86trueno	Tue, 30 March 2004 06:30
	Re: Run-in (or break-in) method	IRA11Y	Tue, 30 March 2004 08:19
	something about some method ???	lateraluss	Tue, 30 March 2004 11:14
	Re: Run-in (or break-in) method	smt_007	Wed, 31 March 2004 09:32
	Re: Run-in (or break-in) method	thechuckster	Wed, 31 March 2004 09:52
	Re: Run-in (or break-in) method	ed_ma61	Wed, 31 March 2004 11:58
	Re: Run-in (or break-in) method	RAV-GT4	Wed, 31 March 2004 12:24
	Re: Run-in (or break-in) method	ed_ma61	Wed, 31 March 2004 12:36
	Re: Run-in (or break-in) method	clubagreenie	Wed, 31 March 2004 13:43
	Re: Run-in (or break-in) method	Chas	Wed, 31 March 2004 22:57
	Re: Run-in (or break-in) method	ed_ma61	Thu, 01 April 2004 06:05
	Re: Run-in (or break-in) method	Chas	Thu, 01 April 2004 07:36

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