Jcx 141 Posted September 13, 2019 Report Share Posted September 13, 2019 As my first service approaches I note that routinely the engine oil is drained but the oil in the oil cooler is not drained. As the first service replaces the Semi-synthetic ‘running-in’ oil with ‘Fully-Synthetic’ oil we will end up with a blend of the two oils and it is possible that any particles picked up by the running-in oil as the engine beds in may remain in the oil located in the oil cooler when the engine is drained. When the engine restarts and the oil recirculates those particles will also circulate. Am I therefore wise to consider draining both oil cooler and engine for a wholesale change to fully synthetic oil. The cost of the oil is not material in the decision; doing the very best thing for my car’s health and performance is my priority. TIA Quote Link to post Share on other sites
notabene 9 Posted September 13, 2019 Report Share Posted September 13, 2019 I had to face same problem month ago. Going from 10w60 to 0w40. After warming up we drained oil from engine and filled with 0w40, keep running for 10mins then drained again and filled again with 0w40 including new oil filter.. I didnt want to disconnect oil cooler or hoses. 1 Quote Link to post Share on other sites
Jcx 141 Posted September 13, 2019 Author Report Share Posted September 13, 2019 37 minutes ago, notabene said: I had to face same problem month ago. Going from 10w60 to 0w40. After warming up we drained oil from engine and filled with 0w40, keep running for 10mins then drained again and filled again with 0w40 including new oil filter.. I didnt want to disconnect oil cooler or hoses. Hmmm good plan. I didn't think of that. That may be a good compromise. Quote Link to post Share on other sites
GFWilliams 1,996 Posted September 13, 2019 Report Share Posted September 13, 2019 Oil cooler is for Gearbox, not engine, though? Quote Link to post Share on other sites
Jcx 141 Posted September 13, 2019 Author Report Share Posted September 13, 2019 Hi George. I think the 410 has both. 1 each side of the front clam. Quote Link to post Share on other sites
Seriouslylotus 447 Posted September 13, 2019 Report Share Posted September 13, 2019 1 hour ago, GFWilliams said: Oil cooler is for Gearbox, not engine, though? V6s and 350 also have Engine oil cooler in the front clam Quote Link to post Share on other sites
Jcx 141 Posted September 13, 2019 Author Report Share Posted September 13, 2019 So Dave @Seriouslylotuswhat is your opinion on my original question? Should i drain the oil from the cooler too so that the full fill is >95% fresh fully synthetic oil or is the 60% fully-synthetic and 40% sem-synthetic mix nothing to worry about in your opinion? One alternative option is to drain the engine and then refill with good stuff - run the engine for 10 minutes to mix it all up and then drain the engine again to refill with fresh. That would give me approx 84% fresh fully-synthetic oil across the 10 litres or so held in the engine and the cooler. TIA Quote Link to post Share on other sites
Kristof Thys 191 Posted September 14, 2019 Report Share Posted September 14, 2019 Albeit in my opinion there is nothing wrong with the 'mix', I did indeed do the exact same procedure as stated above, only difference being 2 hours drive between the two oil changes. Quote Link to post Share on other sites
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.