Hi, I am replacing the AC compressor on a 2004 model vehicle that came with a Sanden SD7H15, and I am using the same Sanden SD7H15. Both old and new compressors are model number 7850, but there's 15 years in age difference between manufacturing dates.
The old unit says it takes SP-20 oil, and that's what is throughout the A/C system as a result. The new unit says SP-10. The odd thing is that the Sanden website says SP-15 for this model:http://www.sanden.com/refrigerantoil.html
So I am concerned I have an oil compatibility issue. I don't want to have to flush the system if it can be avoided because the system was in good shape and only had a very slow leak that never leaked out completely. But I am not sure which oil is correct anyway. Is there some level of compatibility between these oils?
it looks like SP-15 can be added to SP-10 or SP-20 from the chart on that Sanden webpage, but it doesn't seem like SP-10 and SP-20 are interchangeable.
Any suggestions or advice greatly appreciated!