I used to think running a 10W30 would help protect a DI engine from IVD but now I’m not so sure ? There reason is no oil company is putting any research into a 10W30 oil - they just aren’t . The focus is 0W30 and 5W30 for the oil companies addressing major auto maker specifications and requirements which doesn’t include 10W30. I switched to M1 5W30 EP and M1 0W30 ESP long ago in my DI engine . This past week it was time for my 10K mile CRC Intake valve cleaner treatment and the result was FAR less smoke (next to zero) and “can of marbles” sounding engine after the 1 hour soak and first after treatment drive was non - existent now . The engine had a slight hesitation after accelerating for a couple of seconds and that was it . *My point is since switching to and staying with mainstream M1 5W30 EP and M1 0W30 ESP I no longer feel IVD are a concern in at least my DI (Hyundai) engine running 4K mile / 6 month OCI’s. I believe I would have the same experience using PPP or PUP as well with low IVD. The 10W30 oils offered by major oil companies are no longer their best oils and running M1 5W30 EP , M1 0W30 ESP or even 5W30 ESP should present no IVD concerns in a DI engine with conservative OCI’s which in my opinion should be run any way in a DI engine (4K miles / 6 months).Once I run out of my existing stash, I am planning on using the ESP in our DI which is mainly on M1 EP 10W-30 or whatever other Euro oil on sale (lately Castrol). The book and oil cap says 5W-20. Overall I am a M1 user but wonder off sometimes due to sale prices.
Thinking the ESP may even help IVD but the jury may be out on that one. Is there any Euro approval which has IVD related testing?