Engine Size: 2.5L
I need to replace the compressor on a 1988 Toyota 4runner (it blew shaft seal). It was still running R12.
The compressor type is Denso 10P15C.
Various sources indicate that these compressors are pre-filled with oil... Anyone know what type?
Got an answer from Denso:
Thank you for your interest in our products. This compressor is designed by Denso to be used with either R-12 or R-134A (based on the new seal types), but the lubricant in it will be based off the OE RND6 Mineral Oil, which is the original Toyota design where it used R-12. However, if a retro fit has been done on the vehicle and you are using R-134A then during the manifold swap you dump out the mineral oil and use RND Oil 8 (Toyota's suggested oil) or similar.
The techs at Denso also state that there was a service update bulletin released by Toyota stating that during a retro fit they suggest you do 120% of the oil charge and 93% of refrigerant charge. Now I am not a technician, but the guy I talked to said that this would make sense to any trained mechanic.
Check with your supplier on the compressor.
I always drain any oil in a compressor and start fresh knowing the type and amount is correct. If running R12 you will use Mineral oil.
In 2003 I purchased a rebuilt compressor from AMA/ACkits.com for my R-12 1988 Mazda B2200 and it was filled with PAG (tested it at work using FTIR spectroscopy, easy to differentiate), so I flushed it well with mineral-type refrigeration oil and used that (by the way, that lasted me until Oct. 2014).
About 2 months later a co-worker bought a rebuilt compressor from AMA for his R-12 Mazda Protege, and that was filled with mineral-type oil, go figure.
Last October I purchased a replacement new compressor from AMA for that B2200 truck (still R-12); I can't remember, but that may have contained no oil. Anyyway, I added my own mineral-type to that.
So I agree: flush and fill with the oil type that you want to use.
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