My clutch started acting up on my origunal compressor in my 88. Got a great deal on a Four Seasons r4 58238 Lightweight Compressor with Clutch says it comes pre charged with 3 oz of oil. I previously converted my system to r134. Do I need to empty the precharged 3oz of oil it came with? How much and what kind of oil do i add?

 

This is what I used. https://www.thirdgen.org/forums/cool...ml#post6427676

Four Seasons should tell you what they put in there. If it isn't compatible with r134 then yes, dump it, flush it good, then add correct oil. What oil did you use for your prior conversion? Need to be cognizant of that as well. Mixing the wrong oil types can wreak havoc.

 

I normally use PAG 150 from NAPA and it works great. Its a short little black bottle available over the counter.



You should find out what viscocity you have originally if possible...150 was what was recommended to me years ago and I stuck with it. I believe it is in the NAPA computer system as well under the recommendations. For 3rd gen systems.

. If im not mistaken, they said there are a variety of oil weights that are available for R-134a systems. I know there's a 100 and I think 90. But the lighter weights probably wont work well for these older systems.