Subject	Weaker? If an engine has been run on petroleum-based oil for
Posted by	Zuberman on July 31, 2015 at 1:03 AM
	This message has been viewed 216 times.
In Reply To	Re: Nissan released a TSB in Dec 1992 discussing oil posted by twan on July 27, 2015 at 10:21 PM
Message	many miles, like 80K or higher, and then you switch to a true synthetic, there is some risk that the engine will begin to burn oil. This is because the petroleum-based oil does not prevent wear as well as a synthetic and it also gums up, gunks up and varnishes and sludges around the rings which provides a false seal while the rings wear. Over time, this will catch up with itself and the engine will need to be repaired sooner. True synthetic oils have tremendous detergent properties and will clean off that gum, gunk, varnish, and sludge from around the rings over time, and that is why the engine starts to burn oil after switching to synthetic on a high-mileage engine. The weakness is caused by the petroleum-based oil.
Follow Ups	motor oil - lbw46 14:19:06 07/24/15 Re: motor oil - lbw46 14:22:44 07/24/15 I'm a new believer of Rotella T6 5w-40 (n/m) - FrozTTy 17:52:14 07/24/15 Technically why? (n/m) - ZUL8TR 03:14:37 07/25/15 I always ran Mobil oils prior to T6 - FrozTTy 08:35:17 07/26/15 + on the Mobil 1. Maybe 10-40 in warmer climate - ttz'in (norcal) 18:15:14 07/24/15 Re: motor oil - EngineerLV 14:29:46 07/25/15 the "10" is too high. I'd read: - not4resaleZ 19:42:32 07/25/15 Interesting read but depends on conditions used and >> - ZUL8TR 06:30:17 07/26/15 Hot in south Fla so 10W-30 OK for the temps >>>> - ZUL8TR 06:19:10 07/26/15 Great info in general, but follow the manual with new cars - flashstar 14:04:14 07/26/15 Humm! usually there are a range of oils to use depending>> - ZUL8TR 04:13:17 07/27/15 My Apologies: 5w-20 is the only recommended weight - flashstar 15:53:55 07/27/15 Nissan released a TSB in Dec 1992 discussing oil - flashstar 16:05:51 07/27/15 Re: Nissan released a TSB in Dec 1992 discussing oil - Metacom 16:37:49 07/27/15 Re: Nissan released a TSB in Dec 1992 discussing oil - twan 22:21:19 07/27/15 Weaker? If an engine has been run on petroleum-based oil for - Zuberman 01:03:59 07/31/15 Amsoil, 10w - 40 with zi (n/m) - Zblackbeast 20:31:40 07/28/15 Re: Amsoil, 10w - 40 with zi - Zblackbeast 20:32:38 07/28/15 You are VERY smart. (n/m) - Zuberman 04:42:03 07/29/15
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