Quote:
Originally Posted by tturedraider
+1 - this is true. BMW has been doing 10k mile synthetic oil changes for over 20 years now and there’s been no increase in engine failures in all that time.
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My brother-in-law is a BMW master tech and he’s seen far more engine failures post 2000 than pre 2000. Is it due to solely the change in OCI? I doubt it but it’s certainly a contributor/variable. Synthetic oils for cars have been around since the 1970s and became popular in the early 1990s. I started using synthetics in 1992 and my OCI increased from 3k to 5k miles. Could I have gone with an even longer OCI? Yes but I’ve stuck with 5k OCIs since 1992. Is there one correct OCI? No.