[W126 Coupe] PAG VISCOSITY FOR NIPPONDENSO 10P?

[jralex at ix.netcom.com]

Dick, PAG= polyalkeneglycol is a goog lubricant with the highest film strength of all synthetics, groupV. It is however totally incompatible with anything else and will cause a mess especially with even small amounts of petroleum products. Polyolester is used to break down PAG to convert from petro to PAG or the reverse. So many just go ahead with polyolester,groupIV, instead of PAG. I believe this lack of understanding PAG has caused damage to a lot of systems. If you know that PAG only has been in the system and compressor then go with PAG. Sorry that I cannot help you determine what is in there presently. Just trying help avoid a problem. Jim Alexander

-----Original Message-----

>From: Dick Spellman <spell.yy at verizon.net>

>Sent: Jun 14, 2008 7:17 AM

>To: Mercedes Coupes Mailing Lists <mbcoupes at mbcoupes.com>

>Subject: [W126 Coupe] PAG VISCOSITY FOR NIPPONDENSO 10P?

>

>Just need to confirm that the Nippondenso Compressors on MB use PAG 46 

>when operating on R-134A.  Can anyone for certain confirm this?

>

>I am just finishing up the emergency replacement (thanks again Jonathan) 

>of condensor, R/D, Exp. Valve, senders and seals on the 86 300SE started 

>early this am.  It had a very slow leak (1 year) on the edge of the 

>condenser where this car was once impacted by a 100lb dear.  Finally got 

>to the point where replacement was needed the other day.

>

>So, I'm ready to button things up, pull a vacuum and recharge once 

>again.  It's been running r134a for five years now and vent temps normal 

>at max were 47F and with this leak worsening it was approaching 60F when 

>I checked pressures only to learn the Spring charge was already on the 

>way out and the dye was most apparent where the previous accident had 

>occurred.

>

>Anyway, PAG 46 for Nippo 10P?  Thanks in advance.

>

>Regards,

>

>Dick

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